我有7个系统正在运行下面的设置。有时其他磁盘会脱机，但是仔细检查后，该磁盘将正常运行，并且不会出现故障，并且至少可以正常使用一年。因为这在所有7个系统上都发生，所以我发现不可能有单个部分起作用（例如电缆），而是部分不兼容的部分的组合。
问题是要找到不兼容的确切位置。
（如果您有一种解决方法，可以从命令行对硬盘进行虚拟重新放置，则可以回答/server/523315/re-activate-device -被认为是死的）。
服务器硬件：Dell 1950，Dell R815，Dell R715。
操作系统：
$ uname -a
Linux franklin 3.2.0-4-amd64 #1 SMP Debian 3.2.41-2+deb7u2 x86_64 GNU/Linux
控制器：
$ lspci |grep 22:
22:00.0 Serial Attached SCSI controller: LSI Logic / Symbios Logic SAS2008 PCI-Express Fusion-MPT SAS-2 [Falcon] (rev 03)
$ sas2flash -listall
LSI Corporation SAS2 Flash Utility
Version 15.00.00.00 (2012.11.06)
Copyright (c) 2008-2012 LSI Corporation. All rights reserved
Adapter Selected is a LSI SAS: SAS2008(B2)
Num Ctlr FW Ver NVDATA x86-BIOS PCI Addr
----------------------------------------------------------------------------
1 SAS2008(B2) 15.00.00.00 0f.00.00.04 07.29.00.00 00:22:00:00
Finished Processing Commands Successfully.
Exiting SAS2Flash.
SAS / SATA扩展器，具有单个LSI SAS2X36扩展器芯片的Supermicro 4U SAS / SATA扩展器背板：
cat /sys/devices/pci0000:20/0000:20:03.0/0000:22:00.0/host5/port-5:0/expander-5:0/port-5:0:21/end_device-5:0:21/target5:0:21/5:0:21:0/model
SAS2X36
cat /sys/devices/pci0000:20/0000:20:03.0/0000:22:00.0/host5/port-5:0/expander-5:0/port-5:0:21/end_device-5:0:21/target5:0:21/5:0:21:0/rev
0717
磁盘：
$ cat /sys/devices/pci0000:20/0000:20:03.0/0000:22:00.0/host5/port-5:0/expander-5:0/port-5:0:1/end_device-5:0:1/target5:0:1/5:0:1:0/model
Hitachi HDS72404
$ cat /sys/devices/pci0000:20/0000:20:03.0/0000:22:00.0/host5/port-5:0/expander-5:0/port-5:0:1/end_device-5:0:1/target5:0:1/5:0:1:0/rev
A3B0
一个系统中的磁盘：
$ cat /sys/devices/pci0000:20/0000:20:0b.0/0000:23:00.0/host5/port-5:0/expander-5:0/port-5:0:8/end_device-5:0:8/target5:0:8/5:0:8:0/model
ST3000DM001-9YN1
$ cat /sys/devices/pci0000:20/0000:20:0b.0/0000:23:00.0/host5/port-5:0/expander-5:0/port-5:0:8/end_device-5:0:8/target5:0:8/5:0:8:0/rev
CC4C
系统日志：
sd 5:0:22:0: [sdw] Unhandled error code
mpt2sas1: log_info(0x31120303): originator(PL), code(0x12), sub_code(0x0303)
sd 5:0:22:0: [sdw] Unhandled error code
mpt2sas1: log_info(0x31120303): originator(PL), code(0x12), sub_code(0x0303)
sd 5:0:22:0: [sdw]
mpt2sas1: log_info(0x31120303): originator(PL), code(0x12), sub_code(0x0303)
Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK
sd 5:0:22:0: [sdw] CDB: Write(10): 2a 00 3a 92 b9 00 00 01 00 00
end_request: I/O error, dev sdw, sector 982694144
sd 5:0:22:0: [sdw] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK
sd 5:0:22:0: [sdw] CDB: Write(10): 2a 00 3a 92 b7 00 00 01 00 00
end_request: I/O error, dev sdw, sector 982693632
sd 5:0:22:0: [sdw] Unhandled error code
sd 5:0:22:0: [sdw] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK
sd 5:0:22:0: [sdw] CDB: Read(16):
sd 5:0:22:0: [sdw] Unhandled error code
88 00 00 00 00 01 43 e2 f2 d0 00 00 00 10 00 00
end_request: I/O error, dev sdw, sector 5433914064
sd 5:0:22:0: [sdw] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK
sd 5:0:22:0: [sdw] CDB: Write(10): 2a 00 3a 92 bd 00 00 01 00 00
end_request: I/O error, dev sdw, sector 982695168
sd 5:0:22:0: [sdw] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK
md/raid:md4: Disk failure on sdw, disabling device.
md/raid:md4: Operation continuing on 9 devices.
scsi 5:0:22:0: [sdw] Unhandled error code
scsi 5:0:22:0: [sdw] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK
scsi 5:0:22:0: [sdw] CDB: Write(10): 2a 00 3a 92 b8 00 00 01 00 00
end_request: I/O error, dev sdw, sector 982693888
scsi 5:0:22:0: [sdw] Unhandled error code
scsi 5:0:22:0: [sdw] Result: hostbyte=DID_NO_CONNECT driverbyte=DRIVER_OK
scsi 5:0:22:0: [sdw] CDB: Write(10): 2a 00 3a 92 bc 00 00 01 00 00
end_request: I/O error, dev sdw, sector 982694912
mpt2sas1: removing handle(0x0021), sas_addr(0x500304800182694c)
9
+1开始提出重要问题：）
—
斯文
不良的电缆，如果没有屏蔽层，可能会导致校验和问题。[因此导致读写问题]。您是否尝试过更换电缆？
—
僧侣
电缆已替换为已知产品。我也希望Linux在重置scsi总线后重试该命令。
—
Ole Tange
从到目前为止的经验来看，这些消息表明存在连接问题-不是SMART警报。.也许其他具有丰富BiY经验的人可以为您提供帮助。我所知道的是，由于与SAS相比缺少命令/队列，因此它们在大型设置中远离S-ATA磁盘。我请几个来看一下。
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pauska
@pauska您能否详细说明（带有链接？）您所挖出的内容？
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Ole Tange