>>>>> On Thu, 22 Jul 2010 14:43:53 +0100, Rory Campbell-Lange said: > > 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.
You could try using tar or cpio on large tree of files to get a measure of how fast data can be read from the filesystem and written to the spool. __Martin ------------------------------------------------------------------------------ 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
