On Fri, 2007-05-25 at 18:36 +1000, David Chinner wrote: > On Fri, May 25, 2007 at 12:43:51AM -0500, Alberto Alonso wrote: > > I think his point was that going into a read only mode causes a > > less catastrophic situation (ie. a web server can still serve > > pages). > > Sure - but once you've detected one corruption or had metadata > I/O errors, can you trust the rest of the filesystem? > > > I think that is a valid point, rather than shutting down > > the file system completely, an automatic switch to where the least > > disruption of service can occur is always desired. > > I consider the possibility of serving out bad data (i.e after > a remount to readonly) to be the worst possible disruption of > service that can happen ;) I guess it does depend on the nature of the failure. A write failure on block 2000 does not imply corruption of the other 2TB of data. I wish I knew more on the internals of file systems, unfortunately since I don't, I was just commenting on feature that would be nice, but maybe there is no way to implement them. I figured that a dynamic table with bad blocks could be kept, if an attempt to access those blocks is generated (read or write) an I/O error is returned, if the block is not on the list, the access is processed. This would help a server with large file systems continue operations for most users. > > I personally have found the XFS file system to be great for > > my needs (except issues with NFS interaction, where the bug report > > never got answered), but that doesn't mean it can not be improved. > > Got a pointer? I can't seem to find it. I'm pretty sure I used bugzilla to report it. I did find the kernel dump file though, so here it is: Oct 3 15:34:07 localhost kernel: xfs_iget_core: ambiguous vns: vp/0xd1e69c80, invp/0xc989e380 Oct 3 15:34:07 localhost kernel: ------------[ cut here ]------------ Oct 3 15:34:07 localhost kernel: kernel BUG at fs/xfs/support/debug.c:106! Oct 3 15:34:07 localhost kernel: invalid operand: 0000 [#1] Oct 3 15:34:07 localhost kernel: PREEMPT SMP Oct 3 15:34:07 localhost kernel: Modules linked in: af_packet iptable_filter ip_tables nfsd exportfs lockd sunrpc ipv6xfs capability commoncap ext3 jbd mbc ache aic7xxx i2c_dev tsdev floppy mousedev parport_pc parport psmouse evdev pcspkrhw_random shpchp pciehp pci_hotplug intel_agp intel_mch_agp agpgart uhci_h cd usbcore piix ide_core e1000 cfi_cmdset_0001 cfi_util mtdpart mtdcore jedec_probe gen_probe chipreg dm_mod w83781d i2c_sensor i2c_i801 i2c_core raid5 xor genrtc sd_mod aic79xx scsi_mod raid1 md unix font vesafb cfbcopyarea cfbimgblt cfbfillrect Oct 3 15:34:07 localhost kernel: CPU: 0 Oct 3 15:34:07 localhost kernel: EIP: 0060:[__crc_pm_idle +3334982/5290900] Not tainted Oct 3 15:34:07 localhost kernel: EFLAGS: 00010246 (2.6.8-2-686-smp) Oct 3 15:34:07 localhost kernel: EIP is at cmn_err+0xc5/0xe0 [xfs] Oct 3 15:34:07 localhost kernel: eax: 00000000 ebx: f602c000 ecx: c02dcfbc edx: c02dcfbc Oct 3 15:34:07 localhost kernel: esi: f8c40e28 edi: f8c56a3e ebp: 00000293 esp: f602da08 Oct 3 15:34:07 localhost kernel: ds: 007b es: 007b ss: 0068 Oct 3 15:34:07 localhost kernel: Process nfsd (pid: 2740, threadinfo=f602c000 task=f71a7210) Oct 3 15:34:07 localhost kernel: Stack: f8c40e28 f8c40def f8c56a00 00000000 f602c000 074aa1aa f8c41700 ea2f0a40 Oct 3 15:34:07 localhost kernel: f8c0a745 00000000 f8c41700 d1e69c80 c989e380 f7d4cc00 c2934754 074aa1aa Oct 3 15:34:07 localhost kernel: 00000000 f6555624 074aa1aa f7d4cc00 c017d6bd f6555620 00000000 00000000 Oct 3 15:34:07 localhost kernel: Call Trace: Oct 3 15:34:07 localhost kernel: [__crc_pm_idle+3123398/5290900] xfs_iget_core+0x565/0x6b0 [xfs] Oct 3 15:34:07 localhost kernel: [iget_locked+189/256] iget_locked +0xbd/0x100 Oct 3 15:34:07 localhost kernel: [__crc_pm_idle+3124083/5290900] xfs_iget+0x162/0x1a0 [xfs] Oct 3 15:34:07 localhost kernel: [__crc_pm_idle+3252484/5290900] xfs_vget+0x63/0x100 [xfs] Oct 3 15:34:07 localhost kernel: [__crc_pm_idle+3331204/5290900] vfs_vget+0x43/0x50 [xfs] Oct 3 15:34:07 localhost kernel: [__crc_pm_idle+3329570/5290900] linvfs_get_dentry+0x51/0x90 [xfs] Oct 3 15:34:07 localhost kernel: [__crc_pm_idle+1536451/5290900] find_exported_dentry+0x42/0x830 [exportfs] Oct 3 15:34:07 localhost kernel: [__crc_pm_idle+3234969/5290900] xfs_trans_tail_ail+0x38/0x80 [xfs] Oct 3 15:34:07 localhost kernel: [__crc_pm_idle+3174595/5290900] xlog_write+0x102/0x580 [xfs] Oct 3 15:34:07 localhost kernel: [__crc_pm_idle+3234969/5290900] xfs_trans_tail_ail+0x38/0x80 [xfs] Oct 3 15:34:07 localhost kernel: [__crc_pm_idle+3170617/5290900] xlog_assign_tail_lsn+0x18/0x90 [xfs] Oct 3 15:34:07 localhost kernel: [__crc_pm_idle+3234969/5290900] xfs_trans_tail_ail+0x38/0x80 [xfs] Oct 3 15:34:07 localhost kernel: [__crc_pm_idle+3174595/5290900] xlog_write+0x102/0x580 [xfs] Oct 3 15:34:07 localhost kernel: [alloc_skb+71/240] alloc_skb +0x47/0xf0 Oct 3 15:34:07 localhost kernel: [sock_alloc_send_pskb+197/464] sock_alloc_send_pskb+0xc5/0x1d0 Oct 3 15:34:07 localhost kernel: [sock_alloc_send_skb+45/64] sock_alloc_send_skb+0x2d/0x40 Oct 3 15:34:07 localhost kernel: [ip_append_data+1810/2016] ip_append_data+0x712/0x7e0 Oct 3 15:34:07 localhost kernel: [recalc_task_prio+168/416] recalc_task_prio+0xa8/0x1a0 Oct 3 15:34:07 localhost kernel: [__ip_route_output_key+47/288] __ip_route_output_key+0x2f/0x120 Oct 3 15:34:07 localhost kernel: [udp_sendmsg+831/1888] udp_sendmsg +0x33f/0x760 Oct 3 15:34:07 localhost kernel: [ip_generic_getfrag+0/192] ip_generic_getfrag+0x0/0xc0 Oct 3 15:34:07 localhost kernel: [qdisc_restart+23/560] qdisc_restart +0x17/0x230 Oct 3 15:34:07 localhost kernel: [__crc_pm_idle+1539451/5290900] export_decode_fh+0x5a/0x7a [exportfs] Oct 3 15:34:07 localhost kernel: [__crc_pm_idle+4695505/5290900] nfsd_acceptable+0x0/0x140 [nfsd] Oct 3 15:34:07 localhost kernel: [__crc_pm_idle+4696349/5290900] fh_verify+0x20c/0x5a0 [nfsd] Oct 3 15:34:07 localhost kernel: [__crc_pm_idle+4695505/5290900] nfsd_acceptable+0x0/0x140 [nfsd] Oct 3 15:34:07 localhost kernel: [__crc_pm_idle+4702954/5290900] nfsd_open+0x39/0x1a0 [nfsd] Oct 3 15:34:07 localhost kernel: [__crc_pm_idle+4704974/5290900] nfsd_write+0x5d/0x360 [nfsd] Oct 3 15:34:07 localhost kernel: [skb_copy_and_csum_bits+102/784] skb_copy_and_csum_bits+0x66/0x310 Oct 3 15:34:07 localhost kernel: [resched_task+83/144] resched_task +0x53/0x90 Oct 3 15:34:07 localhost kernel: [skb_copy_and_csum_bits+556/784] skb_copy_and_csum_bits+0x22c/0x310 Oct 3 15:34:07 localhost kernel: [__crc_pm_idle+2136279/5290900] skb_read_and_csum_bits+0x46/0x90 [sunrpc] Oct 3 15:34:07 localhost kernel: [kfree_skbmem+36/48] kfree_skbmem +0x24/0x30 Oct 3 15:34:07 localhost kernel: [__kfree_skb+173/336] __kfree_skb +0xad/0x150 Oct 3 15:34:07 localhost kernel: [__crc_pm_idle+2184090/5290900] xdr_partial_copy_from_skb+0x169/0x180 [sunrpc] Oct 3 15:34:07 localhost kernel: [__crc_pm_idle+2180355/5290900] svcauth_unix_accept+0x272/0x2c0 [sunrpc] Oct 3 15:34:07 localhost kernel: [__crc_pm_idle+4735417/5290900] nfsd3_proc_write+0xb8/0x120 [nfsd] Oct 3 15:34:07 localhost kernel: [__crc_pm_idle+4688328/5290900] nfsd_dispatch+0xd7/0x1e0 [nfsd] Oct 3 15:34:07 localhost kernel: [__crc_pm_idle+4688113/5290900] nfsd_dispatch+0x0/0x1e0 [nfsd] Oct 3 15:34:07 localhost kernel: [__crc_pm_idle+2162754/5290900] svc_process+0x4b1/0x619 [sunrpc] Oct 3 15:34:07 localhost kernel: [__crc_pm_idle+4687545/5290900] nfsd +0x248/0x480 [nfsd] Oct 3 15:34:07 localhost kernel: [__crc_pm_idle+4686961/5290900] nfsd +0x0/0x480 [nfsd] Oct 3 15:34:07 localhost kernel: [kernel_thread_helper+5/16] kernel_thread_helper+0x5/0x10 Oct 3 15:34:07 localhost kernel: Code: 0f 0b 6a 00 0f 0e c4 f8 83 c4 10 5b 5e 5f 5d c3 e8 c6 03 66 Oct 3 15:34:07 localhost kernel: <6>note: nfsd[2740] exited with preempt_count 1 Oct 3 15:51:23 localhost kernel: klogd 1.4.1#17, log source = /proc/kmsg started. Oct 3 15:51:23 localhost kernel: Inspecting /boot/System.map-2.6.8-2-686-smp Oct 3 15:51:24 localhost kernel: Loaded 27755 symbols from /boot/System.map-2.6.8-2-686-smp. Oct 3 15:51:24 localhost kernel: Symbols match kernel version 2.6.8. Oct 3 15:51:24 localhost kernel: No module symbols loaded - kernel modules not enabled. Oct 3 15:51:24 localhost kernel: fef0000 (usable) Oct 3 15:51:24 localhost kernel: BIOS-e820: 00000000bfef0000 - 00000000bfefc000 (ACPI data) Oct 3 15:51:24 localhost kernel: BIOS-e820: 00000000bfefc000 - 00000000bff00000 (ACPI NVS) Oct 3 15:51:24 localhost kernel: BIOS-e820: 00000000bff00000 - 00000000bff80000 (usable) Oct 3 15:51:24 localhost kernel: BIOS-e820: 00000000bff80000 - 00000000c0000000 (reserved) Oct 3 15:51:24 localhost kernel: BIOS-e820: 00000000fec00000 - 00000000fec10000 (reserved) Oct 3 15:51:24 localhost kernel: BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved) Oct 3 15:51:24 localhost kernel: BIOS-e820: 00000000ff800000 - 00000000ffc00000 (reserved) Oct 3 15:51:24 localhost kernel: BIOS-e820: 00000000fff00000 - 0000000100000000 (reserved) Oct 3 15:51:24 localhost kernel: 2175MB HIGHMEM available. Oct 3 15:51:24 localhost kernel: 896MB LOWMEM available. Oct 3 15:51:24 localhost kernel: found SMP MP-table at 000f6810 Oct 3 15:51:24 localhost kernel: On node 0 totalpages: 786304 Oct 3 15:51:24 localhost kernel: DMA zone: 4096 pages, LIFO batch:1 Oct 3 15:51:24 localhost kernel: Normal zone: 225280 pages, LIFO batch:16 Oct 3 15:51:24 localhost kernel: HighMem zone: 556928 pages, LIFO batch:16 Oct 3 15:51:24 localhost kernel: DMI present. Thanks, Alberto - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
