On 25/09/12 17:43, Stephen Thompson wrote:
> Our Sun/Oracle service engineer claims that our drives do not require
> cleaning tapes.  Does that sound legit?

In general: true (as in, "Don't do it as a scheduled item"), but all LTO 
drives require cleaning tapes from time to time and sometimes benefit 
from loading one even if the "clean" light isn't on. It primarily 
depends on the cleanliness of the room where the drive is.

> Our throughput is pretty reasonable for our hardware -- we do use disk
> staging and get something like 60Mb/s to tape.

60Mb/s is _slow_ for LTO3. You need to take a serious look at what 
you're using as stage disk and consider using a raid0 array of SSDs in 
order to keep up.

> Lastly, the tapes that get 200 vs 800 are from the same batch of tapes,
same number of uses, and used by the same pair of SL500 drives.  That's
primarily why I wondered if it could be data dependent (or a bacula bug).


What happens if you mark the volumes as "append" and put them back in 
the library?

I've seen transient scsi errors result in tapes being marked as full.

What does smartctl show for the drive and tape in question? (run this 
against the /dev/sg of the tape drive)





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