1. What Disks to Use
2. How to Copy Files to/from Hydra
3. Disk Quotas
4. Disk Configuration
5. Disk Usage Monitoring
6. NetApp Snapshots: How to Recover Old or Deleted Files
7. Public Disks Scrubber
8. SSD Local Disk Space

1. What Disks to Use

All the useful disk space available on the cluster is mounted off a dedicated device (aka appliance or server), a NetApp filer.

The available disk space is divided in several area (aka partitions):

• a small partition for basic configuration files and small storage, the /home partition,
• a set of medium size partitions, one for SAO users, one for non-SAO users, the /data partitions,
• a set of large partitions, one for SAO users, one for non-SAO users, the /pool partitions,
• a second set of large partitions for temporary storage, the /scratch partitions.

Note that:

• we impose quotas: limits on how much can be stored on each disk (partition/volume/fileset) by each user, and
• we monitor disk usage;
• /home should not be used to keep large files, use /pool instead;
• /pool is for active temporary storage (i.e., while a job is running).
• If you need more disk space or your job(s) use(s) a lot of I/Os,  use /scratch.
  • Both partitions (/pool and /scratch) are scrubbed (see below): old stuff is deleted to make sure there is space for active users.
• None of the disks on the cluster are for long term storage:
  • please copy your results back to your "home" computer and
  • delete what you don't need any longer.
• While the disk system on Hydra is highly reliable, none of the disks on the cluster are backed up.
• Once you reach your quota you won't be able to write anything on that partition until you delete stuff.
• A few nodes have local SSDs (solid state disks), contact us if your jobs can benefit from more disk space, SSDs or local disk space.

2. How to Copy Files to/from Hydra

When copying to Hydra, especially large files, be sure to do it to the appropriate disk (and not /home or /tmp).

2a. To/From Another Linux Machine

• You can copy files to/from hydra using scp, sftp or rsync:

  • to Hydra you can only copy from trusted hosts (computers on SI or SAO/CfA trusted network, or VPN'ed),
  • from Hydra to any host that allows external ssh connections (if you can ssh from Hydra to it, you can scp, sftp and rsync to it).
    
    
• For large transfers (over 70GB, sustained), we ask users to use rsync, and limit the bandwidth to 20 MB/s (70 GB/h),  with the "--bwlimit=" option:
  
  • rsync --bwlimit=20000 ...
    If this pose a problem, contact us (Sylvain or Paul).
    
    
  • Baseline transfer rate from SAO to HDC (Herndon data center) is around 300 Mbps, single thread, or ~36 MB/s or ~126 GB/h (as of Aug. 2016)
    The link saturates near 500 Mbps (50% of Gbps) or 62 MB/s or 220 GB/h 
    
    
• Remember that rm, mv and cp can also create high I/O load, so consider to
  
  • limit your concurrent I/Os: do not start a slew of I/Os at the same time, and
  • serialize your I/Os as much as possible:  run one after the other.

NOTE for SAO Users:

Access from the "outside" to SAO/CfA hosts (computers) is limited to the border control hosts (login.cfa.harvard.edu and pogoN.cfa.harvard.edu), instructions for tunneling via these hosts is explained on

• the CF's SSH Remote Access page, or
• the HEAD Systems Group's SSH FAQ page.

2b.From a Computer Running MacOS

A trusted or VPN'd computer running MacOS can use scp, sftp or rsync:

• Open the Terminal application by going to /Applications/Utilities and finding Terminal. 
• At the prompt, use scp, sftp or rsync, after cd'ing to the right place.

• For large transfers limit the bandwidth and use "rsync --bwlimit=4000".

Alternatively you can use a GUI based ssh/scp compatible tool like FileZilla. Note, Cyberduck is not recommended because it uses a lot of CPU cycles on Hydra.

You will still most likely need to run VPN.

2c. From a Computer Running Windows

You can use scp, sftp or rsync if you install  Cygwin - Note that Cygwin includes a X11 server.

Alternatively you can use a GUI based ssh/scp compatible tool like FileZilla or WinSCP. Note, Cyberduck is not recommended because it uses a lot of CPU cycles on Hydra.

You will still most likely need to run VPN.

2d. Using Globus

(instructions missing)

2e. Using Dropbox

Files can be exchanged with Dropbox using the script Dropbox-Uploader, which can be loaded using the tools/dropbox_uploader module and running the dropbox or dropbox_uploader.sh script. Running this for script for the first time will give instructions on how to configure your Dropbox account and create a ~/.dropbox_uploader config file with authentication information.

Using this method will not sync your Dropbox, but will allow you to upload/download specific files.

3. Disk Quotas

To prevent the disks from filling up and hose the cluster, there is a limit (aka quota) on

• how much disk space and
• how many files (in fact "inodes": the sum of number of files and number of directories)
  each user can keep.

Each quota type has a soft limit (warning) and a hard limit (error) and is specific to each partition. In other words exceeding the soft limit produces warnings; while exceeding the hard limit is not allowed, and results in errors.

4. Disk Configuration

[ this still needs to be updated ]

(as of Nov 2019)

Notes

• The notation
  • 1.8/2.0TB means that the soft limit is 1.8TB and the hard limit is 2.0TB of disk space, while
  • 4/5M means that the soft limit is 4 million inodes and the hard limit is 5 million.
    
    
• It is inefficient to store a slew of small files and if you do you may reach your inodes quota before your space quota (too many small files).
  •  Some of the disk monitoring tools show the inode usage.
  • If your %(inode)>%(space) your disk usage is inefficient,
    consider archiving your files into zip or tar-compressed sets.
    
    
• While some of the tool(s) you use may force you to be inefficient while jobs are running, you should remember to
  • remove useless files when jobs have completed,
  • compress files that can benefit from compression (with gzip, bzip2 or compress), and
  • archive a slew of files into a zip or a tar-compressed set, as follows:
       % zip archive.zip dir/
    or
       % tar -czf archive.tgz dir/
    both examples archive the content of the directory dir/ into a single zip or a tgz file. You can then delete the content of dir/ with
       % rm -rf dir/
• You can unpack each type of archive with
     % unzip archive.zip
  or
     % tar xf archive.tgz
  
  
• The sizes of  some of the partitions (aka the various disks) on the NetApp will "auto-grow" until they reach the  listed maximum capacity,
  so the size shown by the traditional Un*x command, like df does not necessarily reflect the maximum size.
  
  We have implement a FIFO (first in first out) model, where old files are deleted  to make space, aka scrubbed.
  • There is an age limit, meaning that only files older than 180 days (or 90 days) get deleted.
  • Older files get deleted before the newer ones (FIFO),
  • We run a scrubber an a regular interval.
• In any case, we ask you to remove from /pool and /scratch files that you do not need for active jobs.
  
  
• For projects that want dedicated disk space, such space can be secured with project's specific funds when we expand the disk farm (contact us).

5. Disk Monitoring

The following tools can be used to monitor your disk usage.

• You can use the following Un*x commands:

  du	show disk use
  df	show disk free

  or

• you can use Hydra-specific home-grown tools, (these require that you load the tools/local or tools/local+ modules)

  dus-report	run du and parse its output in a more user friendly format
  disk-usage	run df and parse its output in a more user friendly format

• You can also view the disk status at the cluster status web pages, either

  • here (at cfa.harvard.edu)
    or
  • here (at si.edu).

Each site shows the disk usage and a quota report, under the "Disk & Quota" tab, compiled 4x a day respectively, and has links to plots of disk usage vs time.

Disk usage

The output of du can be very long and confusing. It is best used with the option "-hs" to show the sum ("-s") and to print it in a human readable format ("-h").

If there is a lot of files/directory, du can take a while to complete.

For example:

% du -sh dir/
136M    dir/

The output of df can be very long and confusing.

You can use it to query a specific partition and get the output in a human readable format ("-h"), for example:

% df -h /pool/sao
Filesystem           Size  Used Avail Use% Mounted on
10.61.10.1:/vol_sao   20T   15T  5.1T  75% /pool/sao

or try

% df -h --output=source,fstype,size,used,avail,pcent,file /scratch/genomics
Filesystem     Type  Size  Used Avail Use% File
gpfs01         gpfs  400T   95T  306T  24% /scratch/genomics

You can compile the output of du into a more useful report with the dus-report tool. This tool will run du for you (can take a while) and parse its output to produce a more concise/useful report.

For example, to see the directories that hold the most stuff in /pool/sao/hpc:

% dus-report /pool/sao/hpc
 612.372 GB            /pool/sao/hpc
                       capac.   20.000 TB (75% full), avail.    5.088 TB
 447.026 GB  73.00 %   /pool/sao/hpc/rtdc
 308.076 GB  50.31 %   /pool/sao/hpc/rtdc/v4.4.0
 138.950 GB  22.69 %   /pool/sao/hpc/rtdc/vX
 137.051 GB  22.38 %   /pool/sao/hpc/rtdc/vX/M100-test-oob-2
 120.198 GB  19.63 %   /pool/sao/hpc/rtdc/v4.4.0/test2
 120.198 GB  19.63 %   /pool/sao/hpc/rtdc/v4.4.0/test2-2-9
  83.229 GB  13.59 %   /pool/sao/hpc/c7
  83.229 GB  13.59 %   /pool/sao/hpc/c7/hpc
  65.280 GB  10.66 %   /pool/sao/hpc/sw
  64.235 GB  10.49 %   /pool/sao/hpc/rtdc/v4.4.0/test1
  49.594 GB   8.10 %   /pool/sao/hpc/sw/intel-cluster-studio
  46.851 GB   7.65 %   /pool/sao/hpc/rtdc/vX/M100-test-oob-2/X54.ms
  46.851 GB   7.65 %   /pool/sao/hpc/rtdc/vX/M100-test-oob-2/X54.ms/SUBMSS
  43.047 GB   7.03 %   /pool/sao/hpc/rtdc/vX/M100-test-oob-2/X220.ms
  43.047 GB   7.03 %   /pool/sao/hpc/rtdc/vX/M100-test-oob-2/X220.ms/SUBMSS
  42.261 GB   6.90 %   /pool/sao/hpc/c7/hpc/sw
  36.409 GB   5.95 %   /pool/sao/hpc/c7/hpc/tests
  30.965 GB   5.06 %   /pool/sao/hpc/c7/hpc/sw/intel-cluster-studio
  23.576 GB   3.85 %   /pool/sao/hpc/rtdc/v4.4.0/test2/X54.ms
  23.576 GB   3.85 %   /pool/sao/hpc/rtdc/v4.4.0/test2-2-9/X54.ms
  23.576 GB   3.85 %   /pool/sao/hpc/rtdc/v4.4.0/test2/X54.ms/SUBMSS
  23.576 GB   3.85 %   /pool/sao/hpc/rtdc/v4.4.0/test2-2-9/X54.ms/SUBMSS
  22.931 GB   3.74 %   /pool/sao/hpc/rtdc/v4.4.0/test2/X220.ms
  22.931 GB   3.74 %   /pool/sao/hpc/rtdc/v4.4.0/test2-2-9/X220.ms
report in /tmp/dus.pool.sao.hpc.hpc

You can rerun dus-report with different options on the same intermediate file, like

   % dus-report -n 999 -pc 1 /tmp/dus.pool.sao.hpc.hpc

to get a different report, to see the list down to 1%. Use

   % dus-report -help 

to see how else you can use it.

The tool disk-usage runs df and presents its output in a more friendly format:

% disk-usage -d all+
Filesystem                              Size     Used    Avail Capacity  Mounted on
netapp-n1:/vol_home                    6.40T    3.05T    3.35T  48%/38%  /home
netapp-n2:/vol_data_genomics          36.00T    4.83T   31.17T  14%/2%   /data/genomics
netapp-n2:/vol_data/sao               27.00T    8.65T   18.35T  33%/19%  /data/sao
netapp-n2:/vol_data/nasm              27.00T    8.65T   18.35T  33%/19%  /data/nasm
netapp-n2:/vol_data/admin             27.00T    8.65T   18.35T  33%/19%  /data/admin
netapp-n1:/vol_pool_bio              200.00G   30.25G  169.75G  16%/1%   /pool/biology
netapp-n2:/vol_pool_genomics          55.00T   37.98T   17.02T  70%/15%  /pool/genomics
netapp-n1:/vol_pool_sao               37.00T    7.68T   29.32T  21%/1%   /pool/sao
netapp-n1:/vol_pool_sao/nasm          37.00T    7.68T   29.32T  21%/1%   /pool/nasm
emc-isilon:/ifs/nfs/hydra             60.00T   39.82T   20.18T  67%/1%   /pool/isilon
gpfs01:genomics                      400.00T   94.60T  305.40T  24%/9%   /scratch/genomics
gpfs01:sao                           400.00T    5.04T  394.96T   2%/1%   /scratch/sao
netapp-n1:/vol_pool_kistlerl          21.00T   18.50T    2.50T  89%/1%   /pool/kistlerl
netapp-n2:/vol_pool_kozakk            11.00T    7.82T    3.18T  72%/1%   /pool/kozakk
netapp-n1:/vol_pool_nmnh_ggi          21.00T   14.79T    6.21T  71%/8%   /pool/nmnh_ggi
netapp-n1:/vol_pool_sao_access        21.00T    2.37T   18.63T  12%/2%   /pool/sao_access
netapp-n2:/vol_pool_sao_rtdc           2.00T   62.13G    1.94T   4%/1%   /pool/sao_rtdc
netapp-n1:/vol_pool_sylvain           30.00T   24.83T    5.17T  83%/36%  /pool/sylvain
gpfs01:nmnh_bradys                    25.00T   58.71G   24.94T   1%/1%   /scratch/bradys
gpfs01:usda_sel                       25.00T  651.81G   24.36T   3%/4%   /scratch/usda_sel
gpfs01:nzp_ccg                        25.00T  924.33G   24.10T   4%/1%   /scratch/nzp_ccg
gpfs01:nmnh_kistlerl                  50.00T   11.93T   38.07T  24%/1%   /scratch/kistlerl
gpfs01:nmnh_meyerc                    25.00T    0.00G   25.00T   0%/1%   /scratch/meyerc
gpfs01:nmnh_ggi                       25.00T    4.85T   20.15T  20%/1%   /scratch/nmnh_ggi
gpfs01:nmnh_lab                       25.00T    0.00G   25.00T   0%/1%   /scratch/nmnh_lab
gpfs01:stri_ap                        25.00T    0.00G   25.00T   0%/1%   /scratch/stri_ap
gpfs01:sao_atmos                     186.00T   51.15T  134.85T  28%/6%   /scratch/sao_atmos
gpfs01:sao_cga                        25.00T    8.14T   16.86T  33%/4%   /scratch/sao_cga
gpfs01:sao_tess                       50.00T    3.29T   46.71T   7%/4%   /scratch/sao_tess
gpfs01:sao_sylvain                    50.00T    6.63T   43.37T  14%/2%   /scratch/sylvain
gpfs01:nmnh_schultzt                  25.00T  376.87G   24.63T   2%/3%   /scratch/schultzt
gpfs01:wrbu                           40.00T    3.00T   37.00T   8%/1%   /scratch/wrbu
netapp-n1:/vol_pool_admin              3.92T    2.71T    1.21T  70%/5%   /pool/admin
netapp-n1:/vol_pool_galaxy           400.00G  194.15G  205.85G  49%/1%   /pool/galaxy
gpfs01:admin                          20.00T    1.96T   18.04T  10%/21%  /scratch/admin
gpfs01:bioinformatics_dbs             10.00T  868.14G    9.15T   9%/1%   /scratch/dbs
nas:/mnt/pool_01/admin                20.00T    1.67T   18.33T   9%/1%   /store/admin
nas:/mnt/pool_02/nmnh_bradys          40.00T  306.52G   39.70T   1%/1%   /store/bradys
nas:/mnt/pool_02/nmnh_ggi             40.00T   22.09T   17.91T  56%/1%   /store/nmnh_ggi
nas:/mnt/pool_03/public              270.00T   22.55T  247.45T   9%/1%   /store/public
nas:/mnt/pool_01/sao_atmos           299.97T   68.73T  231.24T  23%/1%   /store/sao_atmos
nas:/mnt/pool_01/sao_sylvain         100.00T    8.39T   91.61T   9%/1%   /store/sylvain
nas:/mnt/pool_02/nmnh_schultzt        40.00T    2.49T   37.51T   7%/1%   /store/schultzt
nas:/mnt/pool_02/wrbu                 40.00T  618.24G   39.40T   2%/1%   /store/wrbu

Use

   % disk-usage -help

to see how else to use it.

You can, for instance, get the disk quotas and the max size with:

% disk-usage -d all+ -quotas
                                                                 quotas:  disk space    #inodes     max
Filesystem                              Size     Used    Avail Capacity    soft/hard    soft/hard   size Mounted on
netapp-n1:/vol_home                    6.40T    3.05T    3.35T  48%/38%     50G/100G    1.8M/2.0M   10T /home
netapp-n2:/vol_data_genomics          36.00T    4.83T   31.17T  14%/2%     486G/512G    1.2M/1.3M   30T /data/genomics
netapp-n2:/vol_data/*                 27.00T    8.65T   18.35T  33%/19%    1.9T/2.0T    4.8M/5.0M   40T /data/*
netapp-n1:/vol_pool_bio              200.00G   30.25G  169.75G  16%/1%     1.9T/2.0T    4.8M/5.0M    -  /pool/biology
netapp-n2:/vol_pool_genomics          55.00T   37.98T   17.02T  70%/15%    1.9T/2.0T    4.8M/5.0M    -  /pool/genomics
netapp-n1:/vol_pool_sao               37.00T    7.68T   29.32T  21%/1%     1.9T/2.0T    4.8M/5.0M    -  /pool/*
emc-isilon:/ifs/nfs/hydra             60.00T   39.82T   20.18T  67%/1%         -            -        -  /pool/isilon
gpfs01:genomics                      400.00T   94.60T  305.40T  24%/9%     9.0T/10.0T    25M/26M     -  /scratch/genomics
gpfs01:sao                           400.00T    5.04T  394.96T   2%/1%     9.0T/10.0T    25M/26M     -  /scratch/sao
netapp-n1:/vol_pool_kistlerl          21.00T   18.50T    2.50T  89%/1%    20.0T/21.0T    50M/53M     -  /pool/kistlerl
netapp-n2:/vol_pool_kozakk            11.00T    7.82T    3.18T  72%/1%    10.5T/11.0T    26M/28M     -  /pool/kozakk
netapp-n1:/vol_pool_nmnh_ggi          21.00T   14.79T    6.21T  71%/8%    15.0T/15.8T    37M/39M     -  /pool/nmnh_ggi
netapp-n1:/vol_pool_sao_access        21.00T    2.37T   18.63T  12%/2%    15.0T/15.8T    37M/39M     -  /pool/sao_access
netapp-n2:/vol_pool_sao_rtdc           2.00T   62.13G    1.94T   4%/1%     2.9T/3.0T    7.1M/7.5M   10T /pool/sao_rtdc
netapp-n1:/vol_pool_sylvain           30.00T   24.83T    5.17T  83%/36%   28.5T/30.0T    71M/75M     -  /pool/sylvain
gpfs01:nmnh_bradys                    25.00T   58.71G   24.94T   1%/1%         -            -        -  /scratch/bradys
gpfs01:usda_sel                       25.00T  651.81G   24.36T   3%/4%    24.0T/25.0T    52M/62M     -  /scratch/usda_sel
gpfs01:nzp_ccg                        25.00T  924.33G   24.10T   4%/1%    24.0T/25.0T    52M/62M     -  /scratch/nzp_ccg
gpfs01:nmnh_kistlerl                  50.00T   11.93T   38.07T  24%/1%         -            -        -  /scratch/kistlerl
gpfs01:nmnh_meyerc                    25.00T    0.00G   25.00T   0%/1%    24.0T/25.0T    52M/62M     -  /scratch/meyerc
gpfs01:nmnh_ggi                       25.00T    4.85T   20.15T  20%/1%    24.0T/25.0T    52M/62M     -  /scratch/nmnh_ggi
gpfs01:nmnh_lab                       25.00T    0.00G   25.00T   0%/1%     4.0T/5.0T     10M/12M     -  /scratch/nmnh_lab
gpfs01:stri_ap                        25.00T    0.00G   25.00T   0%/1%     4.0T/5.0T     10M/12M     -  /scratch/stri_ap
gpfs01:sao_atmos                     186.00T   51.15T  134.85T  28%/6%    98.0T/100T    252M/261M    -  /scratch/sao_atmos
gpfs01:sao_cga                        25.00T    8.14T   16.86T  33%/4%     7.0T/8.0T     18M/20M     -  /scratch/sao_cga
gpfs01:sao_tess                       50.00T    3.29T   46.71T   7%/4%    36.0T/40.0T    94M/210M    -  /scratch/sao_tess
gpfs01:sao_sylvain                    50.00T    6.63T   43.37T  14%/2%    48.0T/50.0T   115M/128M    -  /scratch/sylvain
gpfs01:nmnh_schultzt                  25.00T  376.87G   24.63T   2%/3%         -            -        -  /scratch/schultzt
gpfs01:wrbu                           40.00T    3.00T   37.00T   8%/1%    38.0T/40.0T    99M/100M    -  /scratch/wrbu
netapp-n1:/vol_pool_admin              3.92T    2.71T    1.21T  70%/5%     5.7T/6.0T     14M/15M    10T /pool/admin
netapp-n1:/vol_pool_galaxy           400.00G  194.15G  205.85G  49%/1%    10.7T/11.3T    27M/28M    15T /pool/galaxy
gpfs01:admin                          20.00T    1.96T   18.04T  10%/21%        -            -        -  /scratch/admin
gpfs01:bioinformatics_dbs             10.00T  868.14G    9.15T   9%/1%         -            -        -  /scratch/dbs
nas:/mnt/pool_01/admin                20.00T    1.67T   18.33T   9%/1%         -            -        -  /store/admin
nas:/mnt/pool_02/nmnh_bradys          40.00T  306.52G   39.70T   1%/1%         -            -        -  /store/bradys
nas:/mnt/pool_02/nmnh_ggi             40.00T   22.09T   17.91T  56%/1%         -            -        -  /store/nmnh_ggi
nas:/mnt/pool_03/public              270.00T   22.55T  247.45T   9%/1%       5T/5T          -        -  /store/public
nas:/mnt/pool_01/sao_atmos           299.97T   68.73T  231.24T  23%/1%         -            -        -  /store/sao_atmos
nas:/mnt/pool_01/sao_sylvain         100.00T    8.39T   91.61T   9%/1%         -            -        -  /store/sylvain
nas:/mnt/pool_02/nmnh_schultzt        40.00T    2.49T   37.51T   7%/1%         -            -        -  /store/schultzt
nas:/mnt/pool_02/wrbu                 40.00T  618.24G   39.40T   2%/1%         -            -        -  /store/wrbu

Monitoring Quota Usage

The Linux command quota is working with the NetApp filers (old and new), although not on the GPFS (/scratch) or the NAS (/store).

For example:

Disk quotas for user hpc (uid 7235): 
     Filesystem  blocks   quota   limit   grace   files   quota   limit   grace
10.61.10.1:/vol_home
                  2203M  51200M    100G           46433   1800k   2000k        
10.61.10.1:/vol_sao
                  1499G   1946G   2048G           1420k   4000k   5000k        
10.61.10.1:/vol_scratch/genomics
                 48501M   2048G   4096G            1263   9000k  10000k        
10.61.200.5:/vol/a2v1/genomics01
                   108M  14336G  15360G             613  10000k  12000k        
10.61.10.1:/vol_home/hydra-2/dingdj
                  2203M  51200M    100G           46433   1800k   2000k        

reports your quotas. The -s stands for --human-readable, hence the 'k' and 'G'. While

    % quota -q

will print only information on filesystems where your usage is over the quota. (man quota)

The command quota+ (need to load tools/local) return disk quota for all the disks (see the quota+ section in Additional Tool).

Other Tools

• We compile a quota report 4x/day and provide tools to parse the quota report.
  • The daily quota report is written around 3:00, 9:00, 15:00, and 21:00
    • in a file called quota_report_YYDDMM_HH.txt, located in /data/sao/hpc/quota-reports/unified/.
  • The string YYDDMM_HH corresponds to the date & hour of the report: "160120_09" for Jan 20 2016 9am report.
  • The format of this file is not very user friendly and users are listed by their user ID.

The Hydra-specific tools, (i.e., requires that you load the tools/local module):

• show-quotas - show quota values
• parse-disk-quota-reports - parse quota reports

Examples

show-quotas - show quota values:

% show-quotas -u sylvain
Limited to user=sylvain
                                                            ------- quota ------
filesys                    type       name                      space     #files
/data/sao:nasm:admin       user       sylvain                   8.0TB    40.000M
/home                      user       sylvain                 100.0GB     2.000M
/pool/sao:nasm             user       sylvain                   2.0TB     5.000M
/scratch/genomics:sao:nasm user       sylvain                  10.0TB    25.000M
/pool/sylvain              user       sylvain                  30.0TB    75.000M

Use

   % show-quotas -h

for the complete usage info.

parse-disk-quota-reports will parse the disk quota report file and produce a more concise report:

% parse-disk-quota-reports
Disk quota report: show usage above 85% of quota, (warning when quota > 95%), as of Wed Nov 20 21:00:05 2019.

Volume=NetApp:vol_data_genomics, mounted as /data/genomics
                     --  disk   --     --  #files --     default quota: 512.0GB/1.25M
Disk                 usage   %quota    usage  %quota     name, affiliation - username (indiv. quota)
-------------------- ------- ------    ------ ------     -------------------------------------------
/data/genomics       512.0GB 100.0%     0.17M  13.4% *** Paul Frandsen, OCIO - frandsenp

Volume=NetApp:vol_data_sao, mounted as /data/admin or /data/nasm or /data/sao
                     --  disk   --     --  #files --     default quota:  2.00TB/5M
Disk                 usage   %quota    usage  %quota     name, affiliation - username (indiv. quota)
-------------------- ------- ------    ------ ------     -------------------------------------------
/data/admin:nasm:sao  1.88TB  94.0%     0.01M   0.1%     uid=11599

Volume=NetApp:vol_home, mounted as /home
                     --  disk   --     --  #files --     default quota: 100.0GB/2M
Disk                 usage   %quota    usage  %quota     name, affiliation - username (indiv. quota)
-------------------- ------- ------    ------ ------     -------------------------------------------
/home                 96.5GB  96.5%     0.41M  20.4% *** Roman Kochanov, SAO/AMP - rkochanov
/home                 96.3GB  96.3%     0.12M   6.2% *** Sofia Moschou, SAO/HEA - smoschou
/home                 95.2GB  95.2%     0.11M   5.6% *** Cheryl Lewis Ames, NMNH/IZ - amesc
/home                 95.2GB  95.2%     0.26M  12.8% *** Yanjun (George) Zhou, SAO/SSP - yjzhou
/home                 92.2GB  92.2%     0.80M  40.1%     Taylor Hains, NMNH/VZ - hainst

Volume=NetApp:vol_pool_genomics, mounted as /pool/genomics
                     --  disk   --     --  #files --     default quota:  2.00TB/5M
Disk                 usage   %quota    usage  %quota     name, affiliation - username (indiv. quota)
-------------------- ------- ------    ------ ------     -------------------------------------------
/pool/genomics        1.71TB  85.5%     1.23M  24.6%     Vanessa Gonzalez, NMNH/LAB - gonzalezv
/pool/genomics        1.70TB  85.0%     1.89M  37.8%     Ying Meng, NMNH - mengy
/pool/genomics        1.45TB  72.5%     4.56M  91.3%     Brett Gonzalez, NMNH - gonzalezb
/pool/genomics       133.9GB   6.5%     4.56M  91.2%     Sarah Lemer, NMNH - lemers

Volume=NetApp:vol_pool_kistlerl, mounted as /pool/kistlerl
                     --  disk   --     --  #files --     default quota: 21.00TB/52M
Disk                 usage   %quota    usage  %quota     name, affiliation - username (indiv. quota)
-------------------- ------- ------    ------ ------     -------------------------------------------
/pool/kistlerl       18.35TB  87.4%     0.88M   1.7%     Logan Kistler, NMNH/Anthropology - kistlerl

Volume=NetApp:vol_pool_nmnh_ggi, mounted as /pool/nmnh_ggi
                     --  disk   --     --  #files --     default quota: 15.75TB/39M
Disk                 usage   %quota    usage  %quota     name, affiliation - username (indiv. quota)
-------------------- ------- ------    ------ ------     -------------------------------------------
/pool/nmnh_ggi       14.78TB  93.8%     8.31M  21.3%     Vanessa Gonzalez, NMNH/LAB - gonzalezv

Volume=NetApp:vol_pool_sao, mounted as /pool/nasm or /pool/sao
                     --  disk   --     --  #files --     default quota:  2.00TB/5M
Disk                 usage   %quota    usage  %quota     name, affiliation - username (indiv. quota)
-------------------- ------- ------    ------ ------     -------------------------------------------
/pool/nasm:sao        1.78TB  89.0%     0.16M   3.2%     Guo-Xin Chen, SAO/SSP-AMP - gchen

reports disk usage when it is above 85% of the quota.

Use

   % parse-disk-quota-reports -h

for the complete usage info, or read the man page (man parse-disk-quota-reports).

• Users whose quotas are above the 85% threshold will receive a warning email one a week (issued on Monday mornings).
  • This is a warning, as long as you are below 100% you are OK.
  • Users won't be able to write on disks on which they have exceeded their hard limits.

6. NetApp Snapshots: How to Recover Old or Deleted Files.

Some of the disks on the NetApp filer have the so called "snapshot mechanism" enabled:

• This allow users to recover deleted files or access an older version of a file.
• Indeed, the NetApp filer makes a "snapshot" copy of the file system (the content of the disk) every so often and keeps these snapshots up to a given age.
• So if we enable hourly snapshot and set a two weeks retention, you can recover a file as it was hours ago, days ago or weeks ago, but only up to two weeks ago.
• The drawback of the snapshot is that when files are deleted, the disk space is not freed until the deleted files age-out, like 2 or 4 weeks later.

How to Use the NetApp Snapshots:

To recover an old version or a deleted file, foo.dat, that was (for example) in /data/genomics/frandsen/important/results/:

• If the file was deleted:

   % cd /data/genomics/.snapshot/XXXX/frandsen/important/results
   % cp -pi foo.dat /data/genomics/frandsen/important/results/foo.dat

• If you want to recover an old version:

   % cd /data/genomics/.snapshot/XXXX/frandsen/important/results
   % cp -pi foo.dat /data/genomics/frandsen/important/results/old-foo.dat

• The "-p" will preserve the file creation date and the "-i" will prevent overwriting an existing file. 
• The "XXXX" is to be replaced by either:
  • hourly.YYYY-MM-DD_HHMM
  • daily.YYYY-MM-DD_0010
  • weekly.YYYY-MM-DD_0015
    where YYY-MM-DD is a date specification (i.e., 2015-11-01)
    
• The files under .snapshot are read-only:
  • they be recovered using cp, tar or rsync; but
  • they cannot be moved (mv) or deleted (rm).

7. Public Disks Scrubber

In order to maintain free disk space on the public disks, we are about to implement disk scrubbing: removing old files and old empty directories.

What is Scrubbing?

We remove old files and old empty directories from a set of disks on a weekly basis.

Old empty directories will be deleted, old files will be, at first, moved away in a staging location, then deleted.

The following instructions explain

• What disks will be scrubbed.
• What to do to access the scrubber's tools.
• How to
  
  • look at the scrubber's report;
  • find out which old empty directories were scrubbed;
  • find out which old files were scrubbed;
  • create a recovery request.

What disks will be scrubbed?

The disks that will be scrubbed are:

• /pool/biology       - 180 days
• /pool/genomics      - 180 days
• /pool/sao           - 180 days
• /scratch/genomics   -  90 days
• /scratch/genomics01 -  90 days
• /scratch/sao        -  90 days
• /scratch/sao01      -  90 days

How to access the scrubber's tools

• load the module:

      module load tools/scrubber

• to get the list of tools, use:

      module help tools/scrubber 

• to get the man page, accessible after loading the module, use:

       man <tool-name>

How to check what will be scrubbed

• To check what files will be scrubbed, use:
  
   find-scrub [-in <dir>] [-age <age>]
  

  this will look for files older than <age> days in <dir>, by default dir=current working directory, and age=173 or 83 days.

• This search taxes the file system (aka disk server), especially if you have a lot of files, so use as needed only.

How to look at the scrubber's results

• To look at the report for what was scrubbed on Jul 21 2016 under /pool/genomics/frandsenp:

       show-scrubber-report /pool/genomics/frandsenp 160721

• To find out which old empty directories where scrubbed:

       list-scrubbed-dirs [-long|-all] /pool/genomics/frandsenp 160721 [<RE>|-n]

 where the <RE> is an optional regular-expression to limit the printout, w/o an RE your get the complete list, unless you specify -n and you get the number of scrubbed directories.

The -long or -all option allows you to get more info (like age, size and owner)

• To find out which old files where scrubbed:

       list-scrubbed-files [-long|-all] /pool/genomics/frandsenp 160721 [<RE>|-n]

 where again the <RE> is an optional regular-expression to limit the printout, w/o an RE your get the complete list, unless you specify -n and you get the number of scrubbed files;

 the -long option will produce a list that includes the files' age and size, -all will list age, size and owner.

• The <RE> (regular expressions) are PERL-style RE:
  • .     means any char,
  •  .*  means any set of chars,
  • [a-z] means any single character between a and z,
  • ^     means start of match,
  • $     means end of match, etc (see gory details here).
• for example:

       '^/pool/genomics/blah/project/.*\.log$'  

means all the files that end in '.log' under '/pool/genomics/blah/project/'

How to produce a list of files to restore

• To produce the list of files to restore as some of  the files scrubbed under /pool/genomics/frandsenp/big-project, you can:

1. create a list with
   list-scrubbed-files /pool/genomics/frandsenp 160721 /pool/genomics/frandsenp/big-project > restore.list
    this will lists all the scrubbed files under 'big-project/' and save the list in restore.list
   
   Note that /pool/genomics/frandsenp/big-project means /pool/genomics/frandsenp/big-project*,
   if you want to restrict to /pool/genomics/frandsenp/big-project, add a '/', i.e.: use /pool/genomics/frandsenp/big-project/
    
2.  edit the file 'restore.list' to trim it, with any text editor (if needed),
    
3. verify with:
   verify-restore-list /pool/genomics/frandsenp  160721 restore.list
   or use
   verify-restore-list -d /pool/genomics/frandsenp  160721 restore.list
     if the verification produced an error.
   
   
4. Only then, and if the verification produced no error, submit your scrubbed file restoration request as follow:
   • SAO users: email the file(s) or the location of the files to Sylvain at hpc@cfa.harvard.edu
   • non-SAO users: email the file(s) or the location of the files to SI-HPC@si.edu

8. SSD Local Disk Space

• Local SSDs (solid state disks) are available on a few nodes available.
• You should contact us if your jobs can benefit from accessing local SSD.
• How to use the SSD is explained here.

Last Updated 20 Nov 2019  SGK/PBF.