背景

     近日操作移动一台R620 外接MD1400的设备。系统关机、服务器、存储断电、移机、链接、加电、开机，一气呵成。

但是。。。。。

系统起来后，fdisk -l 没有发现MD1400的硬盘信息，/var/log/message 日志如下

Jun 23 20:30:44 xz001 kernel: scsi 12:0:0:0: Direct-Access     iDRAC    SECUPD           0329 PQ: 0 ANSI: 0 CCS
Jun 23 20:30:44 xz001 kernel: sd 12:0:0:0: Attached scsi generic sg2 type 0
Jun 23 20:30:44 xz001 kernel: sd 12:0:0:0: [sdb] 2112 512-byte logical blocks: (1.08 MB/1.03 MiB)
Jun 23 20:30:44 xz001 kernel: sd 12:0:0:0: [sdb] Write Protect is off
Jun 23 20:30:44 xz001 kernel: sd 12:0:0:0: [sdb] Assuming drive cache: write through
Jun 23 20:30:44 xz001 kernel: sd 12:0:0:0: [sdb] Assuming drive cache: write through
Jun 23 20:30:44 xz001 kernel: sdb:
Jun 23 20:30:44 xz001 kernel: sd 12:0:0:0: [sdb] Assuming drive cache: write through
Jun 23 20:30:44 xz001 kernel: sd 12:0:0:0: [sdb] Attached SCSI removable disk
Jun 23 20:30:46 xz001 ntpd[5490]: Deferring DNS for 0.centos.pool.ntp.org 1
Jun 23 20:30:59 xz001 kernel: usb 1-1.6.2: USB disconnect, device number 5
Jun 23 20:31:05 xz001 kernel: usb 1-1.6.2: new high speed USB device number 6 using ehci_hcd
Jun 23 20:31:05 xz001 kernel: usb 1-1.6.2: New USB device found, idVendor=0624, idProduct=0250
Jun 23 20:31:05 xz001 kernel: usb 1-1.6.2: New USB device strings: Mfr=4, Product=5, SerialNumber=6
Jun 23 20:31:05 xz001 kernel: usb 1-1.6.2: Product: Mass Storage Function
Jun 23 20:31:05 xz001 kernel: usb 1-1.6.2: Manufacturer: Avocent
Jun 23 20:31:05 xz001 kernel: usb 1-1.6.2: SerialNumber: 20120731
Jun 23 20:31:05 xz001 kernel: usb 1-1.6.2: configuration #1 chosen from 1 choice
Jun 23 20:31:05 xz001 kernel: scsi13 : SCSI emulation for USB Mass Storage devices
Jun 23 20:31:06 xz001 kernel: scsi 13:0:0:0: Direct-Access     iDRAC    SECUPD           0329 PQ: 0 ANSI: 0 CCS
Jun 23 20:31:06 xz001 kernel: sd 13:0:0:0: Attached scsi generic sg2 type 0
Jun 23 20:31:06 xz001 kernel: sd 13:0:0:0: [sdb] 2112 512-byte logical blocks: (1.08 MB/1.03 MiB)
Jun 23 20:31:06 xz001 kernel: sd 13:0:0:0: [sdb] Write Protect is off
Jun 23 20:31:06 xz001 kernel: sd 13:0:0:0: [sdb] Assuming drive cache: write through
Jun 23 20:31:06 xz001 kernel: sd 13:0:0:0: [sdb] Assuming drive cache: write through
Jun 23 20:31:06 xz001 kernel: sdb:
Jun 23 20:31:06 xz001 kernel: sd 13:0:0:0: [sdb] Assuming drive cache: write through
Jun 23 20:31:06 xz001 kernel: sd 13:0:0:0: [sdb] Attached SCSI removable disk
Jun 23 20:31:21 xz001 kernel: usb 1-1.6.2: USB disconnect, device number 6
Jun 23 20:31:24 xz001 kernel: usbcore: deregistering interface driver usb-storage