Tape backup error

J

jcz

Member
Jun 30, 2021
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Hello.

We have some error of tape backup (Tape backup - Content - New backup). No changer, HP-Ultrium-6250 drive only.

PBS GUI:

2021-06-30T10:25:15+02:00: update media online status
2021-06-30T10:25:15+02:00: media set uuid: ...
2021-06-30T10:25:15+02:00: found 2 groups
2021-06-30T10:25:15+02:00: backup snapshot vm/101/2021-06-22T22:30:01Z
2021-06-30T10:25:15+02:00: allocated new writable media 'weekly-XX'
2021-06-30T10:26:09+02:00: found media label weekly-XX (...)
2021-06-30T10:26:09+02:00: TapeAlertFlags: READ_FAILURE
2021-06-30T10:26:09+02:00: TASK ERROR: aborting due to critical tape alert flags: READ_FAILURE

Syslog:

Jun 30 10:26:09 pbs proxmox-backup-proxy[858]: could not send chunk to reader thread: sending on a closed channel

After that:

root@pbs:~# mt -f /dev/nst0 status
/dev/nst0: Input/output error

Tape is "damaged", but can be formatted and labeled (after reboot). Also i can write and read to/from by dd.

Any idea?

Thx.

J.
 
jcz said:
Hello.

We have some error of tape backup (Tape backup - Content - New backup). No changer, HP-Ultrium-6250 drive only.

PBS GUI:

2021-06-30T10:25:15+02:00: update media online status
2021-06-30T10:25:15+02:00: media set uuid: ...
2021-06-30T10:25:15+02:00: found 2 groups
2021-06-30T10:25:15+02:00: backup snapshot vm/101/2021-06-22T22:30:01Z
2021-06-30T10:25:15+02:00: allocated new writable media 'weekly-XX'
2021-06-30T10:26:09+02:00: found media label weekly-XX (...)
2021-06-30T10:26:09+02:00: TapeAlertFlags: READ_FAILURE
2021-06-30T10:26:09+02:00: TASK ERROR: aborting due to critical tape alert flags: READ_FAILURE
Click to expand...
This indicates that the cartridge is damaged (stored in cartridge memory). Have you already tried with another cartridge?

Also, please use 'pmt' instead of 'mt' command.
 
Last edited:
So... same with other tape :(

root@pbs:~# pmt status
using device /dev/tape/by-id/scsi-HUJ6XXXCAV-sg
Error: SCSI inquiry failed - scsi command failed: transport error
 
ok normally that read_failure flag gets only set if either the tape or the drive produces read errors (meaning one of them could be damaged)

jcz said:
Also i can write and read to/from by dd.
Click to expand...
where to you read write to ?

can you read the exact data back when you write it ?
e.g. try with random data and check if you get the same data back
 
Tested with:

dd if=random.bin of=/dev/nst0 bs=512k
dd if=/dev/nst0 bs=512k of=random.XX

Several times with hash checks. All tests were fine.
 
mhmm how much data did you write on the tape ? (maybe it was to little and was cached by the drive ?)
 
About 5x 1GB. Now i tried 5GB in one file with dd and had almost same error. Maybe drive is really bad :(
 
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