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    Input/Output error


    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,

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

    Code:
    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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    This looks like it's a bug in the fs code. You might want to try searching the xfs devs' bugzilla to see if this is a known issue. If it's not, you might want to open a bug report:

    http://oss.sgi.com/bugzilla/buglist....tatus=REOPENED
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