本来应该只有连接到主存储的通道才会在/dev下生成设备文件，但是有一定几率出现：备存储的通道被linux识别到了，但是无法使用，于是在oracle服务器上报通道io错误。

这个错误不会对生产造成实质影响，如果要干掉鬼盘，需要存储那边进行排查，并且客户端服务器需要重启。

messages日志报错：

Oct 31 14:10:58 p2ccdbbj01 kernel: end_request: I/O error, dev sdap, sector 0
Oct 31 14:10:58 p2ccdbbj01 kernel: end_request: I/O error, dev sdap, sector 8
Oct 31 14:10:58 p2ccdbbj01 kernel: end_request: I/O error, dev sdap, sector 0
Oct 31 14:10:58 p2ccdbbj01 kernel: end_request: I/O error, dev sdaq, sector 0
Oct 31 14:10:58 p2ccdbbj01 kernel: end_request: I/O error, dev sdaq, sector 0
Oct 31 14:10:58 p2ccdbbj01 kernel: end_request: I/O error, dev sdaq, sector 2097024
Oct 31 14:10:58 p2ccdbbj01 kernel: end_request: I/O error, dev sdaq, sector 2097136
Oct 31 14:10:58 p2ccdbbj01 kernel: end_request: I/O error, dev sdaq, sector 0
Oct 31 14:10:58 p2ccdbbj01 kernel: end_request: I/O error, dev sdaq, sector 8
Oct 31 14:10:58 p2ccdbbj01 kernel: end_request: I/O error, dev sdaq, sector 0
Oct 31 14:10:58 p2ccdbbj01 kernel: end_request: I/O error, dev sdcf, sector 0
Oct 31 14:10:58 p2ccdbbj01 kernel: end_request: I/O error, dev sdcg, sector 0
Oct 31 14:10:58 p2ccdbbj01 kernel: end_request: I/O error, dev sdap, sector 0
Oct 31 14:10:58 p2ccdbbj01 kernel: end_request: I/O error, dev sdaq, sector 0
Oct 31 14:10:58 p2ccdbbj01 kernel: end_request: I/O error, dev sdcf, sector 0
Oct 31 14:10:58 p2ccdbbj01 kernel: end_request: I/O error, dev sdcg, sector 0
Oct 31 14:10:58 p2ccdbbj01 kernel: end_request: I/O error, dev sdap, sector 0
Oct 31 14:10:58 p2ccdbbj01 kernel: end_request: I/O error, dev sdaq, sector 0
Oct 31 14:10:59 p2ccdbbj01 kernel: end_request: I/O error, dev sdcf, sector 0
Oct 31 14:10:59 p2ccdbbj01 kernel: end_request: I/O error, dev sdcg, sector 0

/proc/partitions可以看到sdcf等

  69    16     153600 sdcd
  69    17     153570 sdcd1
  69    32     153600 sdce
  69    33     153570 sdce1
  69    48    1048576 sdcf
  69    64    1048576 sdcg
253     0  208666624 dm-0
253     1  208666624 dm-1
253     2  418381824 dm-2

但是用fdisk -l  | grep sdcf看不到报错的设备

最后在/dev/disks/by-path下发现，出问题的设备的确是fc设备，只是后面的地址和其它通道出入很大

lrwxrwxrwx 1 root root 11 Oct 30 18:20 pci-0000:42:00.0-fc-0x5006016446e037ac:0x0012000000000000-part1 -> ../../sdbj1
lrwxrwxrwx 1 root root 10 Oct 30 18:20 pci-0000:42:00.0-fc-0x5006016446e037ac:0x0013000000000000 -> ../../sdbk
lrwxrwxrwx 1 root root 11 Oct 30 18:20 pci-0000:42:00.0-fc-0x5006016446e037ac:0x0013000000000000-part1 -> ../../sdbk1
lrwxrwxrwx 1 root root 10 Oct 30 18:20 pci-0000:42:00.0-fc-0x5006016446e03829:0x0000000000000000 -> ../../sdcf
lrwxrwxrwx 1 root root 10 Oct 30 18:20 pci-0000:42:00.0-fc-0x5006016b46e037ac:0x0000000000000000 -> ../../sdbl
lrwxrwxrwx 1 root root 11 Oct 30 18:21 pci-0000:42:00.0-fc-0x5006016b46e037ac:0x0000000000000000-part1 -> ../../sdbl1
lrwxrwxrwx 1 root root 10 Oct 30 18:20 pci-0000:42:00.0-fc-0x5006016b46e037ac:0x0001000000000000 -> ../../sdbm
lrwxrwxrwx 1 root root 11 Oct 30 18:20 pci-0000:42:00.0-fc-0x5006016b46e037ac:0x0001000000000000-part1 -> ../../sdbm1

lrwxrwxrwx 1 root root 10 Oct 30 18:20 pci-0000:42:00.0-fc-0x5006016b46e03829:0x0000000000000000 -> ../../sdcg