Tape Media Set / Drive deadlock

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Tape Media Set / Drive deadlock

Veeam Logoby gadget » Wed May 13, 2015 12:34 am

Hi All,

We have an issue whereby when our weekly backups run longer than usual the duplication to tape naturally also runs late (obviously expected) - now when this causes us a problem is when it then causes the following daily backup to queue (weekly and daily tapes are different media pools). The scenario is this;

  • VM to Tape job detects both full and incremental backup files ('weekly' and 'daily')
  • VM to Tape job locks the drive AND the weekly pool, and begins backing up
  • File to Tape job incremental is triggered (time-based trigger)
  • File to Tape job locks the daily pool, but is unable to continue due to no drive
  • VM to Tape job completes the weekly duplication, and begins the daily duplication
  • VM to Tape job is unable to continue due to the daily pool being locked by the File to Tape job, but doesn't release the lock on the drive, creating a deadlock - neither job proceeds. Ever.
Granted, this is an extraordinary situation - normally the weekly backups complete within their allocated time and this doesn't happen - but twice now in the last two months they've run over due to failures/retrys and this has been the result.

Support (case # 00882109) haven't been overly helpful so far (suggested breaking up the media sets which isn't practical due to tape utilisation issues) - to me it seems like a logic bug in the software (why lock a media set when you're unable to lock a drive to use that media) - would be extremely happy if someone could point out that it's something that I'm doing wrong! :lol:

Cheers,
Ben.
gadget
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Re: Tape Media Set / Drive deadlock

Veeam Logoby Dima P. » Tue May 26, 2015 2:15 pm

Hello Ben,
Thanks for the detailed explanation of your issue and sorry for the late response! The existing logic will be reworked in the upcoming major release, meanwhile, I can only advise to tune the tape job schedule to avoid the described job interference.
Dima P.
Veeam Software
 
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