On May 2, 2007, at 5:59 AM, Jamie Lists wrote: > Hey Scott, > this may sound weird but have pretty much the same setup as you and > we're finding the cause of our terrible backup speeds to be a problem > with ssh speeds on centos. > > We don't know why this is happening yet but are working on it. Also > we're on centos 4.4.
I doubt ssh has changed much between CentOS 4.4 and 5 which is what I'm on. > Anyway try it yourself and see what you come up with. > > On the mac server your backing up use an sftp program such as transmit > and copy a file over sftp to your backup server. On a 100M switch were > only getting copy speeds of 2MB/s. The Mac and the Linux server and connected by GigE on the same switch. An NFS copy of some some 600MB ISO files shows about 15MB/s average. This is measured on the Linux server using iptraf. I'm fairly certain it's not my network. :) During the BackupPC run, I noticed top showed virtually no wait and mostly ran at 80% cpu. That could be due to the compression (default value 3 in use). Disk is cheap so I'm not real worried about saving 10-15% using compression. > Same setup and machines only useing the ftp protocol were getting > 10MB/s > So something is balled up with openssh on centos i think > > Maybe see if that's your problem - Jamie So you're suggesting I replace ssh with sftp under BackupPC and retest? Any info on configuring that as I didn't see it in the BackupPC docs. Thus far my test plan is: 1) Retest full backup now that ssh -c blowfish is set and see what performance looks like 2) Retest full backup with ssh -c blowfish and compression set to 0 3) Test ssh + tar speeds from the Linux server outside of BackupPC to verify performance being seen 4) Any other testing suggested, rsh or sftp for example. One goal I have is to not have to modify the OS X clients at all. Meaning, I should be able to do a fresh 10.4 install, apply the Apple updates, then enable whatever access is needed before I can start recovery. I would rather not have to remember to install xtar or what- not. I appreciate the advice. -- Scott ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ BackupPC-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/backuppc-users http://backuppc.sourceforge.net/
