当 mpt2sas SAS卡连接的磁盘设备出现故障，会在 /var/log/kern 中看到类似如下报错
Feb 15 20:05:28 host1.example.com kernel: : mpt2sas0: log_info(0x31111000): originator(PL), code(0x11), sub_code(0x1000)
Feb 15 20:05:28 host1.example.com kernel: : sd 0:0:11:0: timing out command, waited 360s
Feb 15 20:05:28 host1.example.com kernel: : sd 0:0:11:0: [sdl] Unhandled error code
Feb 15 20:05:28 host1.example.com kernel: : sd 0:0:11:0: [sdl] Result: hostbyte=DID_BUS_BUSY driverbyte=DRIVER_OK
Feb 15 20:05:28 host1.example.com kernel: : sd 0:0:11:0: [sdl] CDB: Write(10): 2a 00 93 9d de ff 00 00 08 00
Feb 15 20:05:28 host1.example.com kernel: : end_request: I/O error, dev sdl, sector 2476596991
Feb 15 20:05:28 host1.example.com kernel: : mpt2sas0: log_info(0x31111000): originator(PL), code(0x11), sub_code(0x1000)
Feb 15 20:05:28 host1.example.com kernel: : sd 0:0:11:0: timing out command, waited 360s
Feb 15 20:05:28 host1.example.com kernel: : sd 0:0:11:0: [sdl] Unhandled error code
Feb 15 20:05:28 host1.example.com kernel: : sd 0:0:11:0: [sdl] Result: hostbyte=DID_BUS_BUSY driverbyte=DRIVER_OK
Feb 15 20:05:28 host1.example.com kernel: : sd 0:0:11:0: [sdl] CDB: Write(10): 2a 00 b2 c8 c5 e7 00 00 08 00
Feb 15 20:05:28 host1.example.com kernel: : end_request: I/O error, dev sdl, sector 2999502311
此时需要检查和处理磁盘 /dev/sdl ，将该磁盘对应的文件系统挂载卸除（如果仍然有io，还需要通过 lsiutil 将磁盘offline）
首先检查磁盘io，确定故障磁盘是否存在磁盘读写，具体数值见 avgqu-sz
输入iostat命令
$iostat -xm 1 /dev/sdl
输出显示
Linux 2.6.32.36xen (host1.example.com) 02/15/2016 _x86_64_ (8 CPU)
avg-cpu: %user %nice %system %iowait %steal %idle
6.11 0.11 11.13 4.02 0.57 78.06
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
sdl 0.19 54.14 3.40 6.05 0.26 0.24 107.94 0.01 3.78 5.50 2.82 3.83 3.62
avg-cpu: %user %nice %system %iowait %steal %idle
2.48 0.92 5.59 17.06 0.21 73.74
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
sdl 0.00 0.00 0.00 0.00 0.00 0.00 0.00 42.00 0.00 0.00 0.00 0.00 100.00
avg-cpu: %user %nice %system %iowait %steal %idle
4.18 0.81 7.91 21.98 0.22 64.91
上述输出显示
avgqu-sz
使用umonut命令卸载磁盘
sudo umount -l /dev/sdl1 && echo 1 | sudo tee /sys/block/sdl/device/delete
此时用df -h检查磁盘 /dev/sdl 已经卸载
不过，还要使用 iostat -xm 1 sdl 检查一下，确保/dev/sdl设备符消失(不再显示输出)。否则需要借助SAS工具来设置磁盘offline。
例如这里再次使用 iostat -xm 1 sdl 发现输出中依然有 sdl 行:
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
sdl 0.00 0.00 0.00 0.00 0.00 0.00 0.00 42.00 0.00 0.00 0.00 0.00 100.00
avg-cpu: %user %nice %system %iowait %steal %idle
2.84 0.78 6.88 15.39 0.21 73.90
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
sdl 0.00 0.00 0.00 0.00 0.00 0.00 0.00 42.00 0.00 0.00 0.00 0.00 100.00
avg-cpu: %user %nice %system %iowait %steal %idle
4.21 0.93 6.21 18.70 0.14 69.81
使用 lsiutil 工具来 offline 磁盘
首先使用lsscsi来显示sdl磁盘对应的设备通道
lsscsi
显示输出
[0:0:0:0] disk ATA ST2000NM0011 SN02 /dev/sda
[0:0:1:0] disk ATA ST2000NM0011 SN02 /dev/sdb
[0:0:2:0] disk ATA ST2000NM0011 SN02 /dev/sdc
[0:0:3:0] disk ATA ST2000NM0011 SN02 /dev/sdd
[0:0:4:0] disk ATA ST2000NM0011 SN02 /dev/sde
[0:0:5:0] disk ATA ST2000NM0011 SN02 /dev/sdf
[0:0:6:0] disk ATA ST2000NM0011 SN02 /dev/sdg
[0:0:7:0] disk ATA ST2000NM0011 SN02 /dev/sdh
[0:0:8:0] disk ATA ST2000NM0011 SN02 /dev/sdi
[0:0:9:0] disk ATA ST2000NM0011 SN02 /dev/sdj
[0:0:10:0] disk ATA ST2000NM0011 SN02 /dev/sdk
[0:0:12:0] enclosu SAS/SATA Expander RevA -
这里看不到/dev/sdl（已经在操作系统中卸载了），但是可以看出按照顺序， /dev/sdl 对应的是 [0:0:11:0]
lsiutil交互程序
sudo lsiutil，交互式下依次输入1、16，找到11对应的Handle（4位字符串）
以下是交互案例
sudo lsiutil
LSI Logic MPT Configuration Utility, Version 1.67, September 15, 2011
1 MPT Port found
Port Name Chip Vendor/Type/Rev MPT Rev Firmware Rev IOC
1. ioc0 LSI Logic SAS2308 B0 200 0a640600 0
Select a device: [1-1 or 0 to quit]
这里输入 1 则显示下级菜单
1. Identify firmware, BIOS, and/or FCode
2. Download firmware (update the FLASH)
4. Download/erase BIOS and/or FCode (update the FLASH)
8. Scan for devices
10. Change IOC settings (interrupt coalescing)
13. Change SAS IO Unit settings
16. Display attached devices
20. Diagnostics
21. RAID actions
23. Reset target
42. Display operating system names for devices
43. Diagnostic Buffer actions
45. Concatenate SAS firmware and NVDATA files
59. Dump PCI config space
60. Show non-default settings
61. Restore default settings
66. Show SAS discovery errors
69. Show board manufacturing information
97. Reset SAS link, HARD RESET
98. Reset SAS link
99. Reset port
e Enable expert mode in menus
p Enable paged mode
w Enable logging
Main menu, select an option: [1-99 or e/p/w or 0 to quit]
这里再输入 16 显示连接的设备
SAS2308's links are 6.0 G, 6.0 G, 6.0 G, 6.0 G, 6.0 G, 6.0 G, 6.0 G, 6.0 G
B___T SASAddress PhyNum Handle Parent Type
5cccc81f16727000 0001 SAS Initiator
5cccc81f16727001 0002 SAS Initiator
5cccc81f16727002 0003 SAS Initiator
5cccc81f16727003 0004 SAS Initiator
5cccc81f16727004 0005 SAS Initiator
5cccc81f16727005 0006 SAS Initiator
5cccc81f16727006 0007 SAS Initiator
5cccc81f16727007 0008 SAS Initiator
500e004aaaaaaa3f 0 0009 0001 Edge Expander
0 0 500e004aaaaaaa00 0 000a 0009 SATA Target
0 1 500e004aaaaaaa01 1 000b 0009 SATA Target
0 2 500e004aaaaaaa02 2 000c 0009 SATA Target
0 3 500e004aaaaaaa03 3 000d 0009 SATA Target
0 4 500e004aaaaaaa04 4 000e 0009 SATA Target
0 5 500e004aaaaaaa05 5 000f 0009 SATA Target
0 6 500e004aaaaaaa06 6 0010 0009 SATA Target
0 7 500e004aaaaaaa07 7 0011 0009 SATA Target
0 8 500e004aaaaaaa08 8 0012 0009 SATA Target
0 9 500e004aaaaaaa09 9 0013 0009 SATA Target
0 10 500e004aaaaaaa0a 10 0014 0009 SATA Target
0 10 500e004aaaaaaa0b 11 0015 0009 SATA Target
0 12 500e004aaaaaaa3e 24 0016 0009 SAS Initiator and Target
Type NumPhys PhyNum Handle PhyNum Handle Port Speed
Adapter 8 0 0001 --> 16 0009 0 6.0
1 0001 --> 17 0009 0 6.0
2 0001 --> 18 0009 0 6.0
3 0001 --> 19 0009 0 6.0
4 0001 --> 20 0009 0 6.0
5 0001 --> 21 0009 0 6.0
6 0001 --> 22 0009 0 6.0
7 0001 --> 23 0009 0 6.0
Expander 25 0 0009 --> 0 000a 0 6.0
1 0009 --> 0 000b 0 6.0
2 0009 --> 0 000c 0 6.0
3 0009 --> 0 000d 0 6.0
4 0009 --> 0 000e 0 6.0
5 0009 --> 0 000f 0 6.0
6 0009 --> 0 0010 0 6.0
7 0009 --> 0 0011 0 6.0
8 0009 --> 0 0012 0 6.0
9 0009 --> 0 0013 0 6.0
10 0009 --> 0 0014 0 6.0
11 0009 --> 0 0015 0 6.0
16 0009 --> 0 0001 0 6.0
17 0009 --> 1 0001 0 6.0
18 0009 --> 2 0001 0 6.0
19 0009 --> 3 0001 0 6.0
20 0009 --> 4 0001 0 6.0
21 0009 --> 5 0001 0 6.0
22 0009 --> 6 0001 0 6.0
23 0009 --> 7 0001 0 6.0
24 0009 --> 24 0016 0 6.0
Enclosure Handle Slots SASAddress B___T (SEP)
0001 8 5cccc81f16727000
0002 0 500e004aaaaaaa00 0 12
Main menu, select an option: [1-99 or e/p/w or 0 to quit]
可以看到其中有一行对应PhyNum数值11的设备的Handle数值串是0015
0 10 500e004aaaaaaa0b 11 0015 0009 SATA Target
这个0015的Handle就是后续我们要offline的设备
再输入命令对应的数值80表示要offline设备
Main menu, select an option: [1-99 or e/p/w or 0 to quit] 80
Enter handle: [0000-FFFF or RETURN to quit]
输入坏盘的Handle数值，也就是输入0015 。
看到Setting SAS phy offline 表示完成
连续输入0、0 退出lsiutil
此时再输入一次检查磁盘
iostat -xm 1 sdl
这时看到输出中avgqu-sz的输出就是空白了，表示这个磁盘已经被 lsiutil 成功 offline
Linux 2.6.32.36xen (host1.example.com) 02/15/2016 _x86_64_ (8 CPU)
avg-cpu: %user %nice %system %iowait %steal %idle
6.11 0.11 11.13 4.02 0.57 78.06
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
avg-cpu: %user %nice %system %iowait %steal %idle
5.98 0.76 10.82 35.17 0.23 47.05
Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu-sz await r_await w_await svctm %util
avg-cpu: %user %nice %system %iowait %steal %idle
3.48 0.65 7.98 36.26 0.22 51.41
踢盘成功后，日志kern显示 device sdl1 错误消失
Feb 15 20:05:43 host1.example.com kernel: : EXT4-fs error (device sdl1): ext4_discard_preallocations: Error in loading buddy information for 14366
Feb 15 20:05:43 host1.example.com kernel: : EXT4-fs error (device sdl1): ext4_discard_preallocations: Error in loading buddy information for 6082
Feb 15 20:05:43 host1.example.com kernel: : EXT4-fs error (device sdl1): ext4_discard_preallocations: Error in loading buddy information for 5970
Feb 15 20:05:44 host1.example.com kernel: : EXT4-fs error (device sdl1): ext4_discard_preallocations: Error in loading buddy information for 14242
Feb 15 20:05:44 host1.example.com kernel: : EXT4-fs error (device sdl1): ext4_discard_preallocations: Error in loading buddy information for 6030
Feb 15 20:05:44 host1.example.com kernel: : EXT4-fs error (device sdl1): ext4_discard_preallocations: Error in loading buddy information for 14230
Feb 15 20:05:44 host1.example.com kernel: : EXT4-fs error (device sdl1): ext4_discard_preallocations: Error in loading buddy information for 14252
Feb 15 20:05:44 host1.example.com kernel: : EXT4-fs error (device sdl1): ext4_put_super: Couldn't clean up the journal
处理完成