Hello John, Many Thanks . I have tested the raw drive speed with vdump and bs=1024, The drive speed is around 35MB/s during vdump.
The tape drive is SCSI LVD.I had tried replacing the cable twice.but no improvement in speed through bacula. Does a spool file on raid0 increases the despooling speed significantly. Because my spooling directory is /var/backup and it is not raided and no spool size limit is set. We use a single processor machine with 4 GB memory and the spool folder is ext3. Is your despooling speed with Compression or not? Either software or hardware compression? Thanks & Regards, Bhaskaran -----Original Message----- From: John Drescher [mailto:[EMAIL PROTECTED] Sent: Wednesday, February 20, 2008 4:55 PM To: Rathinasamy, Bhaskaran (ext) Cc: bacula-users@lists.sourceforge.net Subject: Re: [Bacula-users] Increase DeSpooling Speed. On Feb 20, 2008 10:38 AM, Rathinasamy, Bhaskaran (ext) <[EMAIL PROTECTED]> wrote: > Hello, > > We have a LTO-3 Ultrium Tape Library.Bacula 2.2.7 is implemented in SLES > 9. > > The despooling speed to the tape is 7.8 MB/sec always, even with > hardware compression and no hardware compression. > Is your tape drive scsi? Possiblty the problem is a scsi problem. You can test raw drive speeds with dd something like: time dd if=/dev/sda of=/dev/nst0 bs=1G count=10 If you have hardware compression on do not use /dev/zero because you will get a very unrealistic result. > > Is it possible to increase the despooling speed. > I get despooling speeds of 30 to 45MB/s on a LTO2 autochanger when using a 2GB spool file. My spool folder is currently on its own xfs filesystem and using software raid0. My bacula-sd machine (different machine from the director) is a 2 processor opteron 248 with 4GB of memory. John ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Bacula-users mailing list Bacula-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/bacula-users
