Hi, every one:
Yesterday, I created a 4*2T raid5 just for test, the kernel 2.6.38 was used.
When the array was in recovery, there was IO errors occurred in sdb.
I used "cat /proc/mdstat" to see the status of the array, and "smartctl -A /dev/sdb" of sde.
The outputs were the following:
#cat /proc/mdstat
Personalities : [raid0] [raid6] [raid5] [raid4]
md127 : active raid5 sdd[3] sdc[2] sdb[1](F) sda[0]
5860540032 blocks super 1.2 level 5, 128k chunk, algorithm 2 [4/3] [U_UU]
unused devices: <none>
#smartctl -A /dev/sdb
smartctl 5.39.1 2010-01-28 r3054 [tilegx-unknown-linux-gnu] (local build)
Copyright (C) 2002-10 by Bruce Allen, http://smartmontools.sourceforge.net
Probable ATA device behind a SAT layer
"sdb" was set to "Faulty", and there were no outputs about S.M.A.R.T. of "sdb".
Then I used "reboot" to restart my system. Unfortunately,
The system seemed hanged at down and didn't start up. The outputs were the following:
2012-10-17 20:09:16 umount: can't remount /dev/md127 read-only
2012-10-17 20:09:16 umount: can't remount /dev/sdq2 read-only
2012-10-17 20:09:16 umount: devpts busy - remounted read-only
2012-10-17 20:09:17 umount: sysfs busy - remounted read-only
2012-10-17 20:09:17 umount: proc busy - remounted read-only
2012-10-17 20:09:17 umount: can't remount tmpfs read-only
2012-10-17 20:09:17 umount: can't remount rootfs read-only
2012-10-17 20:09:17 The system is going down NOW!
2012-10-17 20:09:17 Sent SIGTERM to all processes
2012-10-17 20:09:18 md: md127 in immediate safe mode
2012-10-17 20:09:18 Sent SIGKILL to all processes
2012-10-17 20:09:18 Requesting system reboot
2012-10-17 20:09:19 gbe2: link up, 100 Mbps
2012-10-17 20:09:19 md: stopping all md devices.
2012-10-17 20:09:20 sd 1:0:7:0: [sdd] Synchronizing SCSI cache
2012-10-17 20:09:20 BUG: failure at /home/mde4xx/childhood/iDCN_trunk/2.Software/Tilera_src/src/linux-2.6.38.8/drivers/md/md.c:6620/md_write_start()!
2012-10-17 20:09:20 Kernel panic - not syncing: BUG!
2012-10-17 20:09:20
2012-10-17 20:09:20 Starting stack dump of tid 7923, pid 7923 (kworker/1:1) on cpu 1 at cycle 43939696870501
2012-10-17 20:09:20 frame 0: 0xfffffff7001935a0 dump_stack+0x0/0x20 (sp 0xfffffe407863fc18)
2012-10-17 20:09:20 frame 1: 0xfffffff700520960 panic+0x150/0x3a0 (sp 0xfffffe407863fc18)
2012-10-17 20:09:20 frame 2: 0xfffffff700577f08 md_write_start+0x2d8/0x320 (sp 0xfffffe407863fcc0)
2012-10-17 20:09:20 sd 1:0:6:0: [sdo] Synchronizing SCSI cache
2012-10-17 20:09:20 frame 3: 0xfffffff710334268 make_request.cold+0x110/0xc20 [raid456] (sp 0xfffffe407863fd10)
2012-10-17 20:09:20 frame 4: 0xfffffff7007aa078 md_submit_flush_data+0x88/0xe0 (sp 0xfffffe407863fe28)
2012-10-17 20:09:20 frame 5: 0xfffffff7002999e8 process_one_work+0x1e8/0x538 (sp 0xfffffe407863fe48)
2012-10-17 20:09:20 sd 1:0:5:0: [sdn] Synchronizing SCSI cache
2012-10-17 20:09:20 frame 6: 0xfffffff700274f78 worker_thread+0x378/0x898 (sp 0xfffffe407863fea0)
2012-10-17 20:09:20 frame 7: 0xfffffff7000f0530 kthread+0xe0/0xe8 (sp 0xfffffe407863ff80)
2012-10-17 20:09:20 sd 1:0:4:0: [sdm] Synchronizing SCSI cache
2012-10-17 20:09:20 frame 8: 0xfffffff7000bab38 start_kernel_thread+0x18/0x20 (sp 0xfffffe407863ffe8)
2012-10-17 20:09:20 Stack dump complete
2012-10-17 20:09:20 Client requested halt.
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