John T. Yocum wrote: > Actually, i'm using tar for backups. Do the backups take longer also or only the transferred data is getting smaller? It might be so that you are transferring less data so your average transferred data is going smaller.?
> --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. >>> >>> [EMAIL PROTECTED] ~]# 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. 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