On Tue, Feb 22, 2011 at 09:14:24PM +0530, Srinivasan T wrote:
> 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
Looks like an IO error reading the AGF during a transaction. That
would indicate a problem with your storage, not XFS.
Cheers,
Dave.
--
Dave Chinner
david@xxxxxxxxxxxxx
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