amdump performance problem

2007-03-07 Thread Kenneth Berry
Hello list, I have been working on a performance problem for about a month and I am out of ideas. I hope someone can help me. What is happening is that backups of large DLE that start very early seem to dump at a very slow rate. Where as dumps of DLE on the same host, physical drive, etc. that

Re: amdump performance problem

2007-03-07 Thread Joshua Baker-LePain
On Wed, 7 Mar 2007 at 9:58am, Kenneth Berry wrote I have been working on a performance problem for about a month and I am out of ideas. I hope someone can help me. What is happening is that backups of large DLE that start very early seem to dump at a very slow rate. Where as dumps of DLE on

Re: amdump performance problem

2007-03-07 Thread Kenneth Berry
Thank you for the tip on columnspec, I was about to create another post on that problem. The computer mbthome is both the amanda server and client, it is a Dell PE2650 dual Xeon processor, 2GB Ram. Tape unit is LTO3 on a dedicated SCSI controller. Internal HDD's are four SCSI ultra320 10K

Re: amdump performance problem

2007-03-07 Thread Jon LaBadie
On Wed, Mar 07, 2007 at 09:58:09AM -0600, Kenneth Berry wrote: Hello list, I have been working on a performance problem for about a month and I am out of ideas. I hope someone can help me. What is happening is that backups of large DLE that start very early seem to dump at a very slow

Re: amdump performance problem

2007-03-07 Thread Joshua Baker-LePain
On Wed, 7 Mar 2007 at 11:45am, Kenneth Berry wrote The computer mbthome is both the amanda server and client, it is a Dell PE2650 dual Xeon processor, 2GB Ram. Tape unit is LTO3 on a dedicated SCSI controller. Internal HDD's are four SCSI ultra320 10K configured as hardware RAID5. On top of

Re: amdump performance problem

2007-03-07 Thread Brian Cuttler
I'm sorry to interject without having read the complete thread but I wanted to share (remind of previous emails) that I had a problem with my LTO on Solaris a while back. Turned out the HBA card was failing, the A side was dropping in performance with no additional/errors noticable which the B

Re: amdump performance problem

2007-03-07 Thread Kenneth Berry
Thanks for all the great ideas. I have some comments and questions. From Gene's message: The dump's are not going straight to tape which really does slow things down. One of the way I can tell is that the final DLE dump that has been running since midnight is spooling to disk and the tape is

Re: amdump performance problem

2007-03-07 Thread Joshua Baker-LePain
On Wed, 7 Mar 2007 at 2:30pm, Kenneth Berry wrote ---Sequential Output ---Sequential Input-- --Random-- -Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks--- MachineMB K/sec %CPU K/sec %CPU K/sec %CPU K/sec %CPU K/sec % CPU /sec %CPU

Re: amdump performance problem

2007-03-07 Thread Kenneth Berry
Here are the corrected bonnie++ results. 1.) Below are bonnie results on mbthome:/home/public this is on a percraid controller handled as a single 300GB HDD with LVM allocating the space to the following filesystems /home, /home/public/, and /home/public/Ausk... The dump rate last night for this