On Mon, Jun 14, 2010 at 12:17 PM, Keith Edmunds <k...@midnighthax.com> wrote: > We're seeing very slow spooling from a locally-attached disk: > > 12-Jun 10:31 rodney-sd JobId 179: User specified spool size reached. > 12-Jun 10:44 rodney-sd JobId 179: Spooling data again ... > 12-Jun 15:11 rodney-sd JobId 179: User specified spool size reached. > 12-Jun 15:23 rodney-sd JobId 179: Spooling data again ... > 12-Jun 19:59 rodney-sd JobId 179: User specified spool size reached. > 12-Jun 20:12 rodney-sd JobId 179: Spooling data again ... > 12-Jun 23:33 rodney-sd JobId 179: User specified spool size reached. > 12-Jun 23:46 rodney-sd JobId 179: Spooling data again ... > > The spool size is set to 40Gb, so the above shows around 12-13 minutes to > despool 40Gb to tape (sounds reasonable: tape is LT04), but between about > 3.5hrs and 4.5hrs to copy the data to the spooling area. > > Both the spooling area and and source disk are locally mounted SCSI disks. > No other Bacula jobs are running. A manual copy of data from the source > disk to the spooling area seems not unreasonably slow: 11G copied in 5m15s, > which would suggest that the 40Gb spool size should be copied in around 19 > minutes. > > I fully accept that this slow spooling may be due to factors other than > Bacula, but given that manual copy is running around 10-12 faster than the > Bacula spool, I was wondering if there are any known issues with Bacula > spooling? (Also grateful for other suggestions or tests we can run). >
One main other factor is random disk performance on the source filesystem. Since backups are not a sequential operation you will get no where near the performance of copying a large file. Also are you taking about full backups or incrementals/differentials. For the latter 2 backup rate tends to be slow because most of the time is spent finding the changed files. John ------------------------------------------------------------------------------ ThinkGeek and WIRED's GeekDad team up for the Ultimate GeekDad Father's Day Giveaway. ONE MASSIVE PRIZE to the lucky parental unit. See the prize list and enter to win: http://p.sf.net/sfu/thinkgeek-promo _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
