On 22/07/10, John Drescher (dresche...@gmail.com) wrote: > On Thu, Jul 22, 2010 at 7:07 AM, Rory Campbell-Lange > > I am now using a spool to see what is happening for the locally attached > > Coraid storage. The locally attached storage runs at a (contended) write > > of 77MB/s and read of over 100MB/s as confirmed by the tool ddt. > > > > So I now have a Full backup running off local attached storage (Coraid, > > ext3) to fully local storage (HW RAID with BBU, xfs). However bconsole's > > "status client" still shows activity at around 20-30MB/s > > (Bytes/sec=24,363,733) with bacula-fd reading off the target at around > > 20-30MB/s to make a local 250GB file. Incidentally, ?bacula-sd > > periodically writes to tape at ~ 100MB/s. ... > > Is there a problem with bacula-fd? > > > Have you disabled software compression in your fileset? Also random > filesystem performance even on a raid is not great. While you may be > able to read 500MB/s sequential data if the files needed to backup are > not physically ordered sequentially the rate will greatly reduce. Are > you doing a Full Backup? Is your spool on a different raid than the > source data? If the spool is on the same raid this will cause further > reduced performance because it will be causing more seeks again and > reducing the large sequential operations.
I have disabled software compression and the backup is a Full backup as noted above. The spool is local, the file system being backed up is on a Coraid (ethernet-attached) file system. Your point about non-sequential file access is a good one. Nevertheless 20MB/s is very poor performance. -- Rory Campbell-Lange r...@campbell-lange.net ------------------------------------------------------------------------------ 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 Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
