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Re: [BackupPC-users] Poor backup performance
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From: John T. Y. <jo...@fl...> - 2007-03-28 21:48:44
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Actually, i'm using tar for backups. --John Evren Yurtesen wrote: > I figured that --cheksum-seed option will help me, although I cant say yet > if it is working or not, I guess it will take a while until checksum caches > are written for all the files. Do you have this option enabled? > > Thanks, > Evren > > John T. Yocum wrote: >> 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/ >> |
