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    SubjectRe: Are linux-fs's drive-fault-tolerant by concept?
    On Sat, 19 Apr 2003 19:18:56 +0200
    Florian Weimer <fw@deneb.enyo.de> wrote:

    > Stephan von Krawczynski <skraw@ithnet.com> writes:
    >
    > > Most I came across have only small problems (few dead sectors),
    >
    > IDE disks automatically remap defective sectors, so you won't see any
    > of them unless the disk is already quite broken.

    One year ago I thought basically the same, just to give you some info on todays' case (on 2.4.21-pre7-ac1):

    Apr 18 22:08:53 admin kernel: 3w-xxxx: scsi2: Command failed: status = 0xc7, flags = 0x4, unit #0.
    Apr 18 22:08:57 admin kernel: 3w-xxxx: scsi2: AEN: ERROR: Drive error: Port #0.
    Apr 18 22:08:57 admin kernel: 3w-xxxx: scsi2: Command failed: status = 0xc7, flags = 0x80, unit #0.
    Apr 18 22:08:58 admin kernel: 3w-xxxx: scsi2: Reset succeeded.
    Apr 18 22:10:11 admin kernel: 3w-xxxx: scsi2: Command failed: status = 0xc7, flags = 0x4b, unit #0.
    Apr 18 22:10:13 admin kernel: 3w-xxxx: scsi2: Reset succeeded.
    Apr 18 22:11:20 admin kernel: 3w-xxxx: scsi2: Command failed: status = 0xc7, flags = 0x58, unit #0.
    Apr 18 22:11:23 admin kernel: 3w-xxxx: scsi2: Reset succeeded.
    Apr 18 23:11:27 admin kernel: 3w-xxxx: scsi2: Command failed: status = 0xc7, flags = 0x1b, unit #0.
    Apr 18 23:11:27 admin kernel: 3w-xxxx: scsi2: Command failed: status = 0xc7, flags = 0x1b, unit #0.
    Apr 18 23:11:31 admin kernel: 3w-xxxx: scsi2: Reset succeeded.

    Apr 19 00:15:47 admin kernel: 3w-xxxx: scsi2: Command failed: status = 0xc7, flags = 0x1b, unit #0.
    Apr 19 00:15:47 admin kernel: 3w-xxxx: scsi2: Command failed: status = 0xc7, flags = 0x1b, unit #0.
    Apr 19 00:15:48 admin kernel: 3w-xxxx: scsi2: Reset succeeded.
    Apr 19 00:16:03 admin kernel: 3w-xxxx: scsi2: Command failed: status = 0xc7, flags = 0x80, unit #0.
    Apr 19 00:16:07 admin kernel: 3w-xxxx: scsi2: AEN: ERROR: Drive error: Port #0.
    Apr 19 00:16:09 admin kernel: 3w-xxxx: scsi2: Reset succeeded.
    Apr 19 00:16:26 admin kernel: 3w-xxxx: scsi2: Command failed: status = 0xcb, flags = 0x37, unit #1.
    Apr 19 00:16:26 admin kernel: 3w-xxxx: scsi2: AEN: ERROR: Drive error: Port #0.
    Apr 19 00:16:26 admin kernel: 3w-xxxx: scsi2: Command failed: status = 0xcb, flags = 0x37, unit #1.
    Apr 19 00:16:26 admin kernel: I/O error: dev 08:21, sector 125092104
    Apr 19 00:16:26 admin kernel: 3w-xxxx: scsi2: Command failed: status = 0xcb, flags = 0x37, unit #1.
    Apr 19 00:16:26 admin kernel: I/O error: dev 08:21, sector 125092104
    Apr 19 00:28:06 admin kernel: 3w-xxxx: scsi2: Command failed: status = 0xc7, flags = 0x24, unit #0.
    Apr 19 00:28:10 admin kernel: 3w-xxxx: scsi2: Command failed: status = 0xc7, flags = 0x80, unit #0.
    Apr 19 00:28:36 admin kernel: 3w-xxxx: scsi2: Unit #0: Command (f7419c00) timed out, resetting card.
    Apr 19 00:28:43 admin kernel: 3w-xxxx: scsi2: Reset succeeded.
    Apr 19 00:56:23 admin kernel: 3w-xxxx: scsi2: Command failed: status = 0xc7, flags = 0x80, unit #0.
    Apr 19 00:56:23 admin kernel: 3w-xxxx: scsi2: Command failed: status = 0xc7, flags = 0x4, unit #0.
    Apr 19 00:56:23 admin kernel: 3w-xxxx: scsi2: Command failed: status = 0xc7, flags = 0x9, unit #0.
    Apr 19 00:56:23 admin kernel: 3w-xxxx: scsi2: Command failed: status = 0xc7, flags = 0x80, unit #0.
    Apr 19 00:56:23 admin last message repeated 2 times

    Apr 19 00:56:27 admin kernel: 3w-xxxx: scsi2: AEN: ERROR: Drive error: Port #0.
    Apr 19 00:56:27 admin kernel: 3w-xxxx: scsi2: Command failed: status = 0xc7, flags = 0x80, unit #0.
    Apr 19 00:56:54 admin kernel: 3w-xxxx: scsi2: Unit #0: Command (f7415200) timed out, resetting card.
    Apr 19 00:56:54 admin kernel: 3w-xxxx: scsi2: Command failed: status = 0xc7, flags = 0x80, unit #0.
    Apr 19 00:56:56 admin kernel: 3w-xxxx: scsi2: Reset succeeded.
    Apr 19 00:57:30 admin kernel: 3w-xxxx: scsi2: Command failed: status = 0xc7, flags = 0x1b, unit #0.
    Apr 19 00:57:34 admin kernel: 3w-xxxx: scsi2: AEN: WARNING: ATA port timeout: Port #0.
    Apr 19 00:57:59 admin kernel: 3w-xxxx: scsi2: Command failed: status = 0xc7, flags = 0x1b, unit #0.
    Apr 19 00:58:03 admin kernel: 3w-xxxx: scsi2: AEN: WARNING: ATA port timeout: Port #0.
    Apr 19 00:58:29 admin kernel: 3w-xxxx: scsi2: Command failed: status = 0xc7, flags = 0x1b, unit #0.
    Apr 19 00:58:32 admin kernel: 3w-xxxx: scsi2: AEN: WARNING: ATA port timeout: Port #0.
    Apr 19 00:58:58 admin kernel: 3w-xxxx: scsi2: Command failed: status = 0xc7, flags = 0x1b, unit #0.
    Apr 19 00:59:02 admin kernel: 3w-xxxx: scsi2: AEN: WARNING: ATA port timeout: Port #0.
    Apr 19 00:59:27 admin kernel: 3w-xxxx: scsi2: Command failed: status = 0xc7, flags = 0x1b, unit #0.
    Apr 19 00:59:31 admin kernel: 3w-xxxx: scsi2: AEN: WARNING: ATA port timeout: Port #0.
    Apr 19 00:59:56 admin kernel: 3w-xxxx: scsi2: Command failed: status = 0xc7, flags = 0x1b, unit #0.

    And then reiserfs is going mad:

    Apr 19 00:59:56 admin kernel: I/O error: dev 08:11, sector 53320
    Apr 19 00:59:56 admin kernel: journal-601, buffer write failed
    Apr 19 00:59:56 admin kernel: kernel BUG at prints.c:334!
    Apr 19 00:59:56 admin kernel: invalid operand: 0000
    Apr 19 00:59:56 admin kernel: CPU: 1
    Apr 19 00:59:56 admin kernel: EIP: 0010:[reiserfs_panic+56/112] Not tainted
    Apr 19 00:59:56 admin kernel: EIP: 0010:[<c0188128>] Not tainted
    Apr 19 00:59:56 admin kernel: EFLAGS: 00010282
    Apr 19 00:59:56 admin kernel: eax: 00000024 ebx: f6ce8c00 ecx: 00000001 edx: c02cb6cc
    Apr 19 00:59:56 admin kernel: esi: 00000000 edi: f6ce8c00 ebp: 00000006 esp: c34f5eb8
    Apr 19 00:59:56 admin kernel: ds: 0018 es: 0018 ss: 0018
    Apr 19 00:59:56 admin kernel: Process kupdated (pid: 9, stackpage=c34f5000)
    Apr 19 00:59:56 admin kernel: Stack: c029a58c c036c5c0 f6ce8c00 f8c136b4 c019352a f6ce8c00 c02a3220 00001000
    Apr 19 00:59:56 admin kernel: e32965c0 00000009 00000007 00000000 da2b6c80 00000000 00000014 dde3b000
    Apr 19 00:59:56 admin kernel: 00000004 c01976a1 f6ce8c00 f8c136b4 00000001 00000006 f8c1c3c4 00000004
    Apr 19 00:59:56 admin kernel: Call Trace: [flush_commit_list+714/1104] [do_journal_end+1649/2976] [flush_old_commits+292/448] [reiserfs_write_super+112/128] [syn
    Apr 19 00:59:56 admin kernel: Call Trace: [<c019352a>] [<c01976a1>] [<c01968b4>] [<c0184e40>] [<c014894c>]
    Apr 19 00:59:56 admin kernel: [sync_old_buffers+60/176] [kupdate+253/320] [rest_init+0/96] [rest_init+0/96] [arch_kernel_thread+46/64] [kupdate+0/320]
    Apr 19 00:59:56 admin kernel: [<c01479ac>] [<c0147d1d>] [<c0105000>] [<c0105000>] [<c010581e>] [<c0147c20>]
    Apr 19 00:59:56 admin kernel:

    Apr 19 00:59:56 admin kernel: Code: 0f 0b 4e 01 58 d4 29 c0 85 db 74 0e 0f b7 43 08 89 04 24 e8
    Apr 19 00:59:56 admin kernel: SCSI disk error : host 2 channel 0 id 0 lun 0 return code = 2
    Apr 19 00:59:56 admin kernel: I/O error: dev 08:11, sector 285225664
    Apr 19 00:59:56 admin kernel: I/O error: dev 08:11, sector 285225672
    Apr 19 00:59:56 admin kernel: SCSI disk error : host 2 channel 0 id 0 lun 0 return code = 2
    Apr 19 00:59:56 admin kernel: I/O error: dev 08:11, sector 285226176
    Apr 19 00:59:56 admin kernel: I/O error: dev 08:11, sector 285226184
    Apr 19 00:59:56 admin kernel: SCSI disk error : host 2 channel 0 id 0 lun 0 return code = 2
    Apr 19 00:59:56 admin kernel: I/O error: dev 08:11, sector 285225920
    Apr 19 00:59:56 admin kernel: I/O error: dev 08:11, sector 285225928
    Apr 19 00:59:56 admin kernel: SCSI disk error : host 2 channel 0 id 0 lun 0 return code = 2
    Apr 19 00:59:56 admin kernel: I/O error: dev 08:11, sector 285226432
    Apr 19 00:59:56 admin kernel: I/O error: dev 08:11, sector 285226440
    Apr 19 00:59:56 admin kernel: SCSI disk error : host 2 channel 0 id 0 lun 0 return code = 2
    Apr 19 00:59:56 admin kernel: I/O error: dev 08:11, sector 285226688
    Apr 19 00:59:56 admin kernel: I/O error: dev 08:11, sector 285226696
    Apr 19 00:59:56 admin kernel: SCSI disk error : host 2 channel 0 id 0 lun 0 return code = 2
    Apr 19 00:59:56 admin kernel: I/O error: dev 08:11, sector 285226944
    Apr 19 00:59:56 admin kernel: I/O error: dev 08:11, sector 285226952
    Apr 19 01:00:00 admin kernel: 3w-xxxx: scsi2: AEN: WARNING: ATA port timeout: Port #0.

    Things turn out a bit more complicated as you may notice ...

    Regards,
    Stephan


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