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Truncated Filesystem

To: xfs@xxxxxxxxxxx
Subject: Truncated Filesystem
From: Benjamin Carr <bcarr@xxxxxxxx>
Date: Fri, 28 Sep 2007 17:40:43 -0400 (EDT)
Sender: xfs-bounce@xxxxxxxxxxx
For the second time in two weeks, a system restart has resulted in a 
truncated filesystem on my server. The server is running 64bit SuSE with a 
fibrechannel connection to a Promise VTrak M500f. The array is populated 
with Hitachi 1TB drives. The filesystem should be ~12TB but is only 1.8TB 
after the system is brough online.

I have tried to collect the relevant information for diagnosing the 
problem. I sought help on #xfs and was referred to the mailing list for 
help.

If you can think of any other useflul information please let me know.

-Ben

----------------------------------------------------------------------------

messages:
Sep 28 16:14:13 climate kernel: attempt to access beyond end of device
Sep 28 16:14:13 climate kernel: sdc1: rw=0, want=25390571776, 
limit=3915735307
Sep 28 16:14:13 climate kernel: I/O error in filesystem ("sdc1") meta-data 
dev sdc1 block 0x5e96560ff       ("xfs_read_buf") error 5 buf count 512
Sep 28 16:14:13 climate kernel: XFS: size check 2 failed

climate:/var/log # file -s /dev/sdc1
/dev/sdc1: SGI XFS filesystem data (blksz 4096, inosz 256, v2 dirs)

climate:/var/log # grep sdc /proc/partitions 
   8    32 12695301632 sdc
   8    33 1957867653 sdc1

climate:/var/log # xfs_db -r /dev/sdc1
xfs_db> sb 0
xfs_db> p
magicnum = 0x58465342
blocksize = 4096
dblocks = 3173821472
rblocks = 0
rextents = 0
uuid = 55e7458f-309a-43e4-90ca-91e72ac63f48
logstart = 2147483652
rootino = 128
rbmino = 129
rsumino = 130
rextsize = 16
agblocks = 99181921
agcount = 32
rbmblocks = 0
logblocks = 32768
versionnum = 0x3084
sectsize = 512
inodesize = 256
inopblock = 16
fname = "\000\000\000\000\000\000\000\000\000\000\000\000"
blocklog = 12
sectlog = 9
inodelog = 8
inopblog = 4
agblklog = 27
rextslog = 0
inprogress = 0
imax_pct = 25
icount = 1472
ifree = 76
fdblocks = 3166809019
frextents = 0
uquotino = 0
gquotino = 0
qflags = 0
flags = 0
shared_vn = 0
inoalignmt = 2
unit = 0
width = 0
dirblklog = 0
logsectlog = 0
logsectsize = 0
logsunit = 0
features2 = 0
xfs_db> sb 1
xfs_db> p
magicnum = 0x58465342
blocksize = 4096
dblocks = 3173821472
rblocks = 0
rextents = 0
uuid = 55e7458f-309a-43e4-90ca-91e72ac63f48
logstart = 2147483652
rootino = null
rbmino = null
rsumino = null
rextsize = 16
agblocks = 99181921
agcount = 32
rbmblocks = 0
logblocks = 32768
versionnum = 0x3084
sectsize = 512
inodesize = 256
inopblock = 16
fname = "\000\000\000\000\000\000\000\000\000\000\000\000"
blocklog = 12
sectlog = 9
inodelog = 8
inopblog = 4
agblklog = 27
rextslog = 0
inprogress = 1
imax_pct = 25
icount = 0
ifree = 0
fdblocks = 3173788576
frextents = 0
uquotino = 0
gquotino = 0
qflags = 0
flags = 0
shared_vn = 0
inoalignmt = 2
unit = 0
width = 0
dirblklog = 0
logsectlog = 0
logsectsize = 0
logsunit = 0
features2 = 0
xfs_db> sb 1
xfs_db> p
magicnum = 0x58465342
blocksize = 4096
dblocks = 3173821472
rblocks = 0
rextents = 0
uuid = 55e7458f-309a-43e4-90ca-91e72ac63f48
logstart = 2147483652
rootino = null
rbmino = null
rsumino = null
rextsize = 16
agblocks = 99181921
agcount = 32
rbmblocks = 0
logblocks = 32768
versionnum = 0x3084
sectsize = 512
inodesize = 256
inopblock = 16
fname = "\000\000\000\000\000\000\000\000\000\000\000\000"
blocklog = 12
sectlog = 9
inodelog = 8
inopblog = 4
agblklog = 27
rextslog = 0
inprogress = 1
imax_pct = 25
icount = 0
ifree = 0
fdblocks = 3173788576
frextents = 0
uquotino = 0
gquotino = 0
qflags = 0
flags = 0
shared_vn = 0
inoalignmt = 2
unit = 0
width = 0
dirblklog = 0
logsectlog = 0
logsectsize = 0
logsunit = 0
features2 = 0

climate:~ # time xfs_check /dev/sdc1
XFS: totally zeroed log
can't seek in filesystem at bb 3967276840
can't read superblock for ag 5
can't seek in filesystem at bb 4760732208
can't read superblock for ag 6
can't seek in filesystem at bb 5554187576
can't read superblock for ag 7
can't seek in filesystem at bb 6347642944
can't read superblock for ag 8
can't seek in filesystem at bb 7141098312
can't read superblock for ag 9
can't seek in filesystem at bb 7934553680
can't read superblock for ag 10
can't seek in filesystem at bb 8728009048
can't read superblock for ag 11
can't seek in filesystem at bb 9521464416
can't read superblock for ag 12
can't seek in filesystem at bb 10314919784
can't read superblock for ag 13
can't seek in filesystem at bb 11108375152
can't read superblock for ag 14
can't seek in filesystem at bb 11901830520
can't read superblock for ag 15
can't seek in filesystem at bb 12695285888
can't read superblock for ag 16
can't seek in filesystem at bb 13488741256
can't read superblock for ag 17
can't seek in filesystem at bb 14282196624
can't read superblock for ag 18
can't seek in filesystem at bb 15075651992
can't read superblock for ag 19
can't seek in filesystem at bb 15869107360
can't read superblock for ag 20
can't seek in filesystem at bb 16662562728
can't read superblock for ag 21
can't seek in filesystem at bb 17456018096
can't read superblock for ag 22
can't seek in filesystem at bb 18249473464
can't read superblock for ag 23
can't seek in filesystem at bb 19042928832
can't read superblock for ag 24
can't seek in filesystem at bb 19836384200
can't read superblock for ag 25
can't seek in filesystem at bb 20629839568
can't read superblock for ag 26
can't seek in filesystem at bb 21423294936
can't read superblock for ag 27
can't seek in filesystem at bb 22216750304
can't read superblock for ag 28
can't seek in filesystem at bb 23010205672
can't read superblock for ag 29
can't seek in filesystem at bb 23803661040
can't read superblock for ag 30
can't seek in filesystem at bb 24597116408
can't read superblock for ag 31


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