I have a SATA disk in an external USB docking station. The computer it
is attached to is on UPS, but the external disk has only surge
protection.
When the power goes out for a moment, the disk, which was /dev/sdc,
seems to come back as /dev/sdd. The disk has a partition that is part
of an LVM volume group, and the file system on the disk is inaccessible.
I've had to restart the system to get the disk back.
Is there a better way (aside from getting the disk on UPS)?
Debian Lenny (mostly), 2.6.26-2-686 stock Debian kernel on Pentium 4
chip w/hyperthreading. The disk uses the GPT partition format.
Most recent incident:
<log>
#power fails
Mar 7 11:21:18 corn kernel: [182529.931888] ethfast: Link is Down
Mar 7 11:21:18 corn kernel: [182530.140155] usb 5-3: USB disconnect, address 4
Mar 7 11:21:18 corn kernel: [182530.140155] usb 5-3.1: USB disconnect, address 7
Mar 7 11:21:18 corn kernel: [182530.140155] usb 5-3.2: USB disconnect, address 8
Mar 7 11:21:18 corn kernel: [182530.140155] usblp0: removed
Mar 7 11:21:18 corn kernel: [182530.375701] usb 5-4: USB disconnect, address 5
#power resumes
Mar 7 11:21:21 corn kernel: [182533.121591] usb 5-3: new high speed USB device using ehci_hcd and address 9
Mar 7 11:21:21 corn kernel: [182533.179788] hub 5-0:1.0: unable to enumerate USB device on port 3
Mar 7 11:21:30 corn kernel: [182542.755370] __ratelimit: 4 messages suppressed
Mar 7 11:21:30 corn kernel: [182542.755379] Buffer I/O error on device dm-15, logical block 8210
Mar 7 11:21:30 corn kernel: [182542.755384] lost page write due to I/O error on dm-15