我有几台服务器使用 2TB Seagate GoFlex 外置硬盘进行基本的 cPanel 备份，但其中一台出现了问题，该硬盘没有在 /dev 中列为设备，尽管它出现在 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
我尝试通过流行的 usbreset.c 脚本对 USB 端口进行电源循环，手动将电源级别设置为挂起/自动，将授权设置为 0（然后返回 1）等。但是，这些似乎都无法让它被识别。
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，输出lsblk，以防有帮助：
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
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:
答案1
如果在所有服务器上使用相同型号的磁盘和相同型号的主板（或 USB 卡），并且驱动程序相同，并且除了一个之外所有都正常工作，那么问题很可能是硬件问题。
我尝试更换的第一个硬件是电缆，因为这是最容易更换的。如果这没有帮助，我会在两台服务器之间交换两个磁盘，看看问题是出在磁盘上还是在同一台服务器上。
答案2
我猜你已经停止了 udev。另请参阅我对你的问题的评论。