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DWFleming

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DWFleming

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May 26th, 2011 13:00

Finding missing space

Excuse such a newbie question so I apologize in advance.

While documenting some space for a report I issued $ nas_pool -size clar-r5_economy

name         = clar_r5_economy
used_mb      = 4870116
avail_mb     = 1138950
total_mb     = 6009066
potential_mb = 3297876

Then I checked this against known configured file systems in this pool I get a total used of 4717476. Why would I not be seeing some missing space (roughly 150 gb)?  Is this related to the reference to potential_mb?

I don't get the same result when issuing the same for clar_r5_performance:

name         = clar_r5_performance
used_mb      = 6430758
avail_mb     = 765318
total_mb     = 7196076
potential_mb = 0

The total used, total available, and total amounts are spot on.

  • DWFleming

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    Posted May 26th, 2011 13:00

    This was what I found on the fs_dedupe -l  (one file system is suspended -- I'm looking into that, one shows no space saved and one shows activity).  All other file systems are currently showing they are not enabled for deduplication.

    Id                                 = 72
    Name                               = TEST-FS
    Deduplication                      = On
    Status                             = Idle
    As of the last file system scan (Tue May 24 13:15:14 CDT 2011):
       Files scanned                   = 3
       Files deduped                   = 0 (0% of total files)
       File system capacity            = 303495 MB
       Original data size              = 301400 MB (99% of current file system capacity)
       Space saved                     = 0 MB (0% of original data size)

    Id                                 = 73
    Name                               = TEST_USR-FS
    Deduplication                      = Suspended
    As of the last file system scan (Wed Feb  2 14:28:38 CST 2011):
       Files scanned                   = 748194
       Files deduped                   = 171393 (20% of total files)
       File system capacity            = 426530 MB
       Original data size              = 393088 MB (92% of current file system capacity)
       Space saved                     = 25980 MB (6% of original data size)

    Id                                 = 74
    Name                               = TEST_DATA-FS
    Deduplication                      = On
    Status                             = Idle
    As of the last file system scan (Wed May 25 16:57:28 CDT 2011):
       Files scanned                   = 3759
       Files deduped                   = 1924 (13% of total files)
       File system capacity            = 403349 MB
       Original data size              = 2117 MB (0% of current file system capacity)
       Space saved                     = 1408 MB (66% of original data size)

    This is the result of the list for pools:

    $ nas_pool -list
    id      inuse   acl     name
    3       y       0       clar_r5_performance
    4       y       0       clar_r5_economy
    10      y       0       clarata_archive

    Sorry for not having a ready answer so I'm not sure how to include the root_vdm's you requested.

  • dynamox

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    Posted May 26th, 2011 13:00

    easy to check "fs_dedupe -l"   ..when you added space for all file systems, did you add root_vdm's as well ?

  • dynamox

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    Posted May 26th, 2011 13:00

    Using snapsure or replication ? Those two will consume some space.

  • dynamox

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    Posted May 26th, 2011 13:00

    what if you run "nas_fs -query:type==uxfs -format:'%s,%s\n' -Fields:name,sizevalues"

    first column after fs name is file system capacity in MB, does that add up to your number ?

  • DWFleming

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    Posted May 26th, 2011 13:00

    Hey thanks for a fast reply.  No neither are in use (at some point maybe replication with a VNX system) and no snapsure at this time. Is it possible one or more file systems have deduplication?

  • dynamox

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    Posted May 26th, 2011 14:00

    OS file systems do not reside in AVM pools, hmm ..i can't think of anything else. Let's see if EMC guys know

  • DWFleming

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    Posted May 26th, 2011 14:00

    No all these sizes are the same I get from the Celerra Manager (which I used to determine the total amount).  Would the OS be located in this disk area possibly?

  • Rainer_EMC

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    Posted May 27th, 2011 01:00

    Did you account for SAVVOLs used by checkpoints or replication ?

    Since they aren’t file systems you would see them in the fs list

    Rainer

  • DWFleming

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    Posted May 27th, 2011 05:00

    Good morning Rainer.   I dont have any replication going at (yet) and no checkpoints configured.

    I only see this with the clar_r5_economy pool.  The clar_r5_performance is accurate.

    Would this have anything to do with the economy pool having potential_mb and the performance pool not having a potential_mb space?

  • Narahari1

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    Posted May 27th, 2011 09:00

    Is there a possibility of NDMP backup using checkpoints and that consuming some space? Also there could be savvol usage by dedupe process too. Do 'fs_ckpt fsname -list -all' for all the file systems in that pool, and look for any checkpoints.