On 09/25/2012 10:43 AM, Alan Brown wrote: > 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.
Why do you say that's slow when the max speed appears to be 80? http://en.wikipedia.org/wiki/Linear_Tape-Open > >> 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) > > > -- Stephen Thompson Berkeley Seismological Laboratory step...@seismo.berkeley.edu 215 McCone Hall # 4760 404.538.7077 (phone) University of California, Berkeley 510.643.5811 (fax) Berkeley, CA 94720-4760 ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
