Hi Richard On 16/07/10, richard ([email protected]) wrote: > Rory Campbell-Lange wrote: > > > Currently I'm getting a throughput of around 10MB/sec to tape, which > > seems pretty low. iotop is showing reading off disk at around > > 17-20MB/sec and one of the 8 cores on this Xeon E5520 (2267MHz) is > > running at 100%. Hardware compression is disabled on the tape changer. > > > > Are there any obvious ways to improve this? Does the problem look like > > gzip, and if so is pigz (parallel gzip) an option? > > Bacula compression is single threaded, so could we be the problem. > > Why are you not using the hardware compression? It adds no throughput > overhead.
I've enabled hardware compression and throughput speed has improved to around 80MB/sec which is better but still not fantastic. It is coming off disk at around 90-100MB/sec so the diffence must be partly down to the hw compression. As a matter of interest, is hardware compression an issue if the data needs to come off these tapes onto another LTO4 drive? It is important that this data can be read for a long time into the future. Kind regards Rory -- Rory Campbell-Lange [email protected] ------------------------------------------------------------------------------ This SF.net email is sponsored by Sprint What will you do first with EVO, the first 4G phone? Visit sprint.com/first -- http://p.sf.net/sfu/sprint-com-first _______________________________________________ Bacula-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/bacula-users
