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Input/Output error

To: xfs@xxxxxxxxxxx
Subject: Input/Output error
From: Srinivasan T <srinivasan@xxxxxxxxxxxxx>
Date: Tue, 22 Feb 2011 21:14:24 +0530
User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.2.12) Gecko/20101027 Lightning/1.0b2 Thunderbird/3.1.6
Hi,

We are running an C++ application in AWS EC2 instance (CentOS 5.4) mounted with an EBS Volume (say /mymountpoint). We do more simultaneous writes to the EBS Volume from our application. But at some point we get 'ERROR: Input/output error'. After this, 'ls -l /mymountpoint' command itself fails with the i/o error. The filesystem which we use for the EBS Volume is xfs.

I unmounted the drive and done xfs_check and again mounted the drive. Now, everything seems to be working fine. But the issue still persists everytime when we do simultaneous writes.

I believe the following details will be useful,

[root@domU-12-31-39-07-81-36 StoreGrid]# cat /etc/redhat-release
CentOS release 5.4 (Final)

[root@domU-12-31-39-07-81-36 StoreGrid]# df -lTi
Filesystem    Type    Inodes   IUsed   IFree IUse% Mounted on
/dev/sda1     ext3   1310720  107566 1203154    9% /
/dev/sdb      ext3   19546112      11 19546101    1% /mnt
none         tmpfs    186059       1  186058    1% /dev/shm
/dev/sdh       xfs   1934272  495857 1438415   26% /mymountpoint

[root@domU-12-31-39-07-81-36 StoreGrid]# uname -a
Linux domU-12-31-39-07-81-36 2.6.21.7-2.fc8xen #1 SMP Fri Feb 15 12:39:36 EST 2008 i686 i686 i386 GNU/Linux

Output of dmesg :

SGI XFS with ACLs, security attributes, large block numbers, no debug enabled
SGI XFS Quota Management subsystem
Filesystem "sdh": Disabling barriers, not supported by the underlying device
XFS mounting filesystem sdh
Ending clean XFS mount for filesystem: sdh
Filesystem "sdh": XFS internal error xfs_trans_cancel at line 1138 of file fs/xfs/xfs_trans.c.  Caller 0xee201944
 [<ee2032fe>] xfs_trans_cancel+0x59/0xe3 [xfs]
 [<ee201944>] xfs_rename+0x8f8/0x954 [xfs]
 [<ee201944>] xfs_rename+0x8f8/0x954 [xfs]
 [<ee21458c>] xfs_vn_rename+0x30/0x70 [xfs]
 [<c10bb5e3>] selinux_inode_rename+0x11f/0x16d
 [<c1078d88>] vfs_rename+0x2c3/0x441
 [<c107a77f>] sys_renameat+0x15a/0x1b4
 [<c1074b7f>] sys_stat64+0xf/0x23
 [<c1072d3b>] __fput+0x140/0x16a
 [<c10841ee>] mntput_no_expire+0x11/0x6a
 [<c107a800>] sys_rename+0x27/0x2b
 [<c1005688>] syscall_call+0x7/0xb
 =======================
xfs_force_shutdown(sdh,0x8) called from line 1139 of file fs/xfs/xfs_trans.c.  Return address = 0xee217778
Filesystem "sdh": Corruption of in-memory data detected.  Shutting down filesystem: sdh
Please umount the filesystem, and rectify the problem(s)
I/O error in filesystem ("sdh") meta-data dev sdh block 0x3c0001       ("xfs_trans_read_buf") error 5 buf count 512
I/O error in filesystem ("sdh") meta-data dev sdh block 0x780001       ("xfs_trans_read_buf") error 5 buf count 512
xfs_force_shutdown(sdh,0x1) called from line 423 of file fs/xfs/xfs_rw.c.  Return address = 0xee217778
xfs_force_shutdown(sdh,0x1) called from line 423 of file fs/xfs/xfs_rw.c.  Return address = 0xee217778
Filesystem "sdh": Disabling barriers, not supported by the underlying device
XFS mounting filesystem sdh
Starting XFS recovery on filesystem: sdh (logdev: internal)
Ending XFS recovery on filesystem: sdh (logdev: internal)


The XFS utilities are in v2.9.4

Any help would be appreciated.

Regards,
Srinivasan
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