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Re: [BackupPC-users] Poor backup performance
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From: John T. Y. <jo...@fl...> - 2007-03-28 21:36:24
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Here is the iostat output, the server is doing two full backups at the moment, along with a nightly. Server specs: P4 3.2Ghz, 512MB RAM, 300GB SATA drive. [root@backup2 ~]# iostat Linux 2.6.9-42.0.10.ELsmp (backup2.fluidhosting.com) 03/28/2007 avg-cpu: %user %nice %sys %iowait %idle 2.98 0.00 0.76 50.02 46.24 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn sda 69.48 798.71 428.68 1556126098 835203048 sda1 0.00 0.00 0.00 1556 200 sda2 0.17 2.68 0.57 5219723 1109536 sda3 0.00 0.00 0.00 1073 320 sda4 0.00 0.00 0.00 2 0 sda5 0.23 3.04 1.14 5914146 2215408 sda6 111.33 792.87 426.97 1544752254 831876168 On that server, we're seeing backup speeds as low as .11MB/s which are backups of several thousand files. Some backups are over 1MB/s, but those are servers with only 100ish files. --John Evren Yurtesen wrote: > John T. Yocum wrote: >> According to the 3ware CLI, the cache is enabled. > > I have the same problem with much slower speeds (since I dont use SATA > or raid it makes things worse) My finding is that backuppc is doing a > lot of work while checking the files. Can you check if you are seeing > extreme disk activity in your backup servers at the backup time? > > Thanks, > Evren > >> --John >> >> John Pettitt wrote: >>> Have you checked that the 3ware actually has cache enabled - it has a >>> habit of disabling it if the battery backup is bad or missing and it >>> will make a *huge* difference .... >>> >>> John >>> >>> John T. Yocum wrote: >>>> I'm seeing terrible backup performance on my backup servers, the >>>> speed has slowly degraded over time. Although, I have never seen >>>> speeds higher than 1MB/s. (We have it set to do no more than 2 >>>> backups at a time.) >>>> >>>> Here is our setup: >>>> >>>> Our network is all 100Mb between servers, and switches, and 1Gb >>>> between switches. So, there is enough network capacity for decent >>>> performance. >>>> >>>> The servers being backed up, all have either RAID1 or RAID5 arrays >>>> consisting of 15K RPM SCSI drives. All RAID is done in hardware. >>>> >>>> The backup servers are using 7200RPM SATA drives, connected to 3ware >>>> 8500 or 9000 series controllers. Two the backup servers are using >>>> RAID1, and the other is using RAID5. >>>> >>>> Our backup servers are running CentOS 4.4, with ext3fs for the >>>> backup partition. I have noatime enabled, and data=writeback set to >>>> hopefully improve performance. >>>> >>>> On our backup servers, they are all showing a very high wait during >>>> backups. Here's a screenshot from one of them >>>> http://www.publicmx.com/fh/backup2.jpg. At the time it was doing two >>>> backups, and a nightly. >>>> >>>> Any advice on improving performance, would be much appreciated. >>>> >>>> Thank you, >>>> John >>>> >>>> ------------------------------------------------------------------------- >>>> >>>> Take Surveys. Earn Cash. Influence the Future of IT >>>> Join SourceForge.net's Techsay panel and you'll get the chance to >>>> share your >>>> opinions on IT & business topics through brief surveys-and earn cash >>>> http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV >>>> >>>> _______________________________________________ >>>> BackupPC-users mailing list >>>> Bac...@li... >>>> https://lists.sourceforge.net/lists/listinfo/backuppc-users >>>> http://backuppc.sourceforge.net/ >>>> >>>> >> >> >> ------------------------------------------------------------------------- >> Take Surveys. Earn Cash. Influence the Future of IT >> Join SourceForge.net's Techsay panel and you'll get the chance to >> share your >> opinions on IT & business topics through brief surveys-and earn cash >> http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV >> _______________________________________________ >> BackupPC-users mailing list >> Bac...@li... >> https://lists.sourceforge.net/lists/listinfo/backuppc-users >> http://backuppc.sourceforge.net/ |
