Slightly Urgent: XFS No Space Left On Device

[Dave Hall <kdhall@binghamton.edu>]

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Hello,

I have an XFS file system that's getting 'No space left on device' 
errors.  xfs_fsr also complains of 'No space left'.  The XFS Info is:

    # xfs_info /data
    meta-data=/dev/sdb1              isize=256    agcount=19,
    agsize=268435440 blks
              =                       sectsz=512   attr=2
    data     =                       bsize=4096 blocks=4882431488, imaxpct=5
              =                       sunit=16     swidth=160 blks
    naming   =version 2              bsize=4096   ascii-ci=0
    log      =internal               bsize=4096   blocks=521728, version=2
              =                       sectsz=512   sunit=16 blks,
    lazy-count=1
    realtime =none                   extsz=4096   blocks=0, rtextents=0

    # df -h .
    Filesystem            Size  Used Avail Use% Mounted on
    /dev/sdb1              19T   12T  7.0T  62% /data
    # df -ih .
    Filesystem            Inodes   IUsed   IFree IUse% Mounted on
    /dev/sdb1               3.7G    4.7M    3.7G    1% /data


xfs_db freesp shows that AG 0 seems to be full.  I've included the 
freesp for the first few AGs, but the rest seem pretty consistent with 
AGs 1 - 4 that I've included below.

    xfs_db> freesp -s -e 1000000000 -a 0
        from      to extents  blocks    pct
           1 268435440    1930    3795 100.00
    total free extents 1930
    total free blocks 3795
    average free extent size 1.96632
    xfs_db> freesp -s -e 1000000000 -a 1
        from      to extents  blocks    pct
           1 268435440  287006 173832255 100.00
    total free extents 287006
    total free blocks 173832255
    average free extent size 605.675
    xfs_db> freesp -s -e 1000000000 -a 2
        from      to extents  blocks    pct
           1 268435440  272425 94291252 100.00
    total free extents 272425
    total free blocks 94291252
    average free extent size 346.118
    xfs_db> freesp -s -e 1000000000 -a 3
        from      to extents  blocks    pct
           1 268435440  286421 110208404 100.00
    total free extents 286421
    total free blocks 110208404
    average free extent size 384.778
    xfs_db> freesp -s -e 1000000000 -a 4
        from      to extents  blocks    pct
           1 268435440  277220 107118347 100.00
    total free extents 277220
    total free blocks 107118347
    average free extent size 386.402
    xfs_db>

Is there any way to figure out which files/directories are clogging up 
AG 0?  Any other ways to abate this issue?  Any way to assure 
proportional usage of AGs?

Thanks.

-Dave

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