我有几台服务器使用 2TB 希捷 GoFlex 外置硬盘进行基本的 cPanel 备份，但其中一台出现问题，并且该硬盘未列为 /dev 中的设备，即使它出现在 lsusb 中。
输出lsusb：
root@server-name [/sys/bus/usb/devices]# lsusb
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
Bus 001 Device 005: ID 0bc2:50a5 Seagate RSS LLC FreeAgent GoFlex Desk USB 3.0
Bus 001 Device 003: ID 04b4:6560 Cypress Semiconductor Corp. CY7C65640 USB-2.0 "TetraHub"
输出ls -lh /dev | grep sd：
root@server-name [/sys/bus/usb/devices]# ls -lh /dev | grep sd
crw-rw---- 1 root tty 2, 61 Mar 6 10:58 ptysd
brw-rw---- 1 root disk 8, 0 Mar 6 10:58 sda
brw-rw---- 1 root disk 8, 1 Mar 6 11:00 sda1
brw-rw---- 1 root disk 8, 2 Mar 6 10:58 sda2
crw-rw---- 1 root tty 3, 61 Mar 6 10:58 ttysd
我试图通过流行的 usbreset.c 脚本重新启动 USB 端口，手动将电源级别设置为挂起/自动，将授权设置为 0（并返回 1）等。但是，这些似乎都没有任何作用它认出了。
输出dmesg：
[2439599.103034] usb 1-3: reset high speed USB device number 4 using ehci_hcd
[2440600.692207] usb 1-3: new high speed USB device number 4 using ehci_hcd
[2440600.858527] usb 1-3: device firmware changed
[2440600.858547] usb 1-3: USB disconnect, device number 4
[2440600.961020] usb 1-3: new high speed USB device number 5 using ehci_hcd
[2440601.128405] usb 1-3: New USB device found, idVendor=0bc2, idProduct=50a5
[2440601.128410] usb 1-3: New USB device strings: Mfr=2, Product=3, SerialNumber=1
[2440601.128414] usb 1-3: Product: GoFlex Desk
[2440601.128416] usb 1-3: Manufacturer: Seagate
[2440601.128417] usb 1-3: SerialNumber: NA0M0LAZ
[2440601.128510] usb 1-3: configuration #1 chosen from 1 choice
[2440601.128844] scsi5 : SCSI emulation for USB Mass Storage devices
[2440601.129201] usb-storage: device found at 5
[2440601.129203] usb-storage: waiting for device to settle before scanning
[2440602.129185] usb-storage: device scan complete
[2440622.803210] usb 1-3: reset high speed USB device number 5 using ehci_hcd
[2440643.797143] usb 1-3: reset high speed USB device number 5 using ehci_hcd
[2440664.797199] usb 1-3: reset high speed USB device number 5 using ehci_hcd
[2440685.797139] usb 1-3: reset high speed USB device number 5 using ehci_hcd
最后，lsblk如果有帮助，输出 :
root@server-name [~/usbreset]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
loop0 7:0 0 500M 0 loop /tmp
sda 8:0 0 135.5G 0 disk
├─sda1 8:1 0 500M 0 part /boot
└─sda2 8:2 0 135G 0 part
├─vg_angel-lv_root (dm-0) 253:0 0 50G 0 lvm /
├─vg_angel-lv_swap (dm-1) 253:1 0 7.9G 0 lvm [SWAP]
└─vg_angel-lv_home (dm-2) 253:2 0 77.2G 0 lvm /home
sr0 11:0 1 1024M 0 rom
输出cat /proc/scsi/scsi：
root@server-name [~/usbreset]# cat /proc/scsi/scsi
Attached devices:
Host: scsi0 Channel: 00 Id: 32 Lun: 00
Vendor: DP Model: BACKPLANE Rev: 1.05
Type: Enclosure ANSI SCSI revision: 05
Host: scsi0 Channel: 02 Id: 00 Lun: 00
Vendor: DELL Model: PERC 6/i Rev: 1.11
Type: Direct-Access ANSI SCSI revision: 05
Host: scsi1 Channel: 00 Id: 00 Lun: 00
Vendor: HL-DT-ST Model: CD-ROM GCR-8240N Rev: 1.10
Type: CD-ROM ANSI SCSI revision: 05
的输出cat /proc/usb-storage/5
root@server-name [~/usbreset]# cat /proc/scsi/usb-storage/5
Host scsi5: usb-storage
Vendor: Seagate
Product: GoFlex Desk
Serial Number: NA0M0LAZ
Protocol: Transparent SCSI
Transport: Bulk
Quirks:
如果您在所有具有相同驱动程序的服务器上使用相同型号的磁盘和相同型号的主板（或 USB 卡），并且所有驱动程序都可以正常工作，那么问题很可能是硬件问题。
我要尝试更换的第一件硬件是电缆，因为这是最容易更换的部分。如果这没有帮助，我会在两台服务器之间交换两个磁盘，以查看问题是跟随磁盘还是停留在同一台服务器上。
我猜你已经停止了udev。另请参阅我对您的问题的评论。