Christoph Litauer schrieb: > Thanks a lot Adam! > In the meantime I discussed my problem on the xfs mailing list. We are > not finished yet, but adding mount option "nobarrier" reduced my > performance problems significantly. I am still in contact to clarify if > it's possible to optimize the usage of inode allocation groups. We will > see ... > > To get a better base for further discussions, I did a few benchmarks > using bonnie++: > > bonnie++ -u root -f -n 10:0:0:1000 -d /backuppc -s0 > > result for file creation per second: 5501 (sequential) > result for file creation per second: 6430 (random) > > Without option nobarrier I had 137 files/second .. >
Well ... this was the good news ... ... now the bad ones ... This morning, 2 backup processes were still running. strace'ing one client process, one can see that rsync is waiting for sending data (select). strace'ing the servers process (BackupPC_dump), one can see that it creates tons of directories ... which is correct as I have learned as the dump is an incremental one. But: BackupPC_dump only creates about 60 directories per second (regarding the number of used inodes). A bonnie++ benchmark _in parallel_ on backuppc's filesystem reports 1450 files/directories per second (minimum). Some of my clients have filesystems containig about 250,000 directories. So the creation of the directory tree lasts about 1.5 hours for each client plus the time for transfering the backup data. I think this maybe the reason why my backups are still running in the morning ... What are your directory creation rates regarding BackupPC_dump? -- Regards Christoph ________________________________________________________________________ Christoph Litauer [EMAIL PROTECTED] Uni Koblenz, Computing Center, http://www.uni-koblenz.de/~litauer Postfach 201602, 56016 Koblenz Fon: +49 261 287-1311, Fax: -100 1311 PGP-Fingerprint: F39C E314 2650 650D 8092 9514 3A56 FBD8 79E3 27B2 ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://sourceforge.net/services/buy/index.php _______________________________________________ BackupPC-users mailing list [email protected] List: https://lists.sourceforge.net/lists/listinfo/backuppc-users Wiki: http://backuppc.wiki.sourceforge.net Project: http://backuppc.sourceforge.net/
