Re: [Bacula-users] LTO2 get filled at 136GB or 85GB

> hi,
> 
> i am running Bacula 5.0.2 on Debian Lenny amd64 with a Certance LTO2 streamer.
> 
> since a while my backupjobs does not get finished, as bacula says
> 
> 
> 10-Jun 06:54 lx01-sd JobId 2422: Despooling elapsed time = 00:00:51, Transfer
> rate = 22.89 M Bytes/second
> 10-Jun 06:56 lx01-sd JobId 2422: Writing spooled data to Volume. Despooling
> 1,167,755,347 bytes ...
> 10-Jun 06:57 lx01-sd JobId 2422: Despooling elapsed time = 00:00:48, Transfer
> rate = 24.32 M Bytes/second
> 10-Jun 06:58 lx01-sd JobId 2422: Writing spooled data to Volume. Despooling
> 1,167,755,351 bytes ...
> 10-Jun 06:59 lx01-sd JobId 2422: End of Volume "LX03DO01" at 159:2982 on
> device "Certlto2" (/dev/nst0). Write of 64512 bytes got -1.
> 10-Jun 06:59 lx01-sd JobId 2422: Re-read of last block succeeded.
> 10-Jun 06:59 lx01-sd JobId 2422: End of medium on Volume "LX03DO01"
> Bytes=158,745,581,568 Blocks=2,460,713 at 10-Jun-2011 06:59.
> 
> LTO2 should be able to store 200GB on a media?
> 

158GB is probably a bit low. 85GB is definitely a problem. Is this something 
that has been getting worse over time? How old are the tapes?

Does your tape drive vendor provide any drive assessment tools? Eg HP provide 
Library & Tape Tools.

LTO is pretty smart and the heads are organised so that immediately after the 
media passes under the write head it passes under the read head and the data 
just written is read. If there is a problem reading it the data is rewritten. 
Obviously every time a block has to be rewritten the effective capacity of the 
tape is reduced. The drive assessment tools should tell you how much this is 
happening (margin, I think) and otherwise report the condition of the drive and 
the tapes.

Some of our tapes are down to about 175GB capacity. Curiously it is the set of 
5 tapes used on Fridays that are suffering from this problem which is strange 
as they are used about 5 times less than the other tapes.

James
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