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Arcserve r15 raw with allow file restore performance

Posted on 2010-08-26
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Hi,  is it common for the performance of arcserve r15 to drop quite alot when doing raw backups with the allow file level restore option in the agent for virtual machines compared to doing just raw backups?

environment is 2 virtual hosts setup in a clustered shared volume with the VMs being backuped using a HP g2 autoloader connected to a physical backup server using a SAS 3Gbps connection.  Virtulaisation software is hyper v 2008 R2.
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Question by:LBC
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dax_bad earned 2000 total points
ID: 33529212
HI LBC,

We're only on R12 but can't wait til we upgrade to R15 as we are using hyperV R2 as well. So i can say from personal experience, but i would say that the performance degrade is because of the file level backup, where you backup each file to be able to do single file restores, just like you would with sharepoint or Exchange fx. With the RAW option only, you only backup the VHD's which is much faster than backing up xxxxx number of single files.

A general rule of thumb is a small number of large files (Less I/O read/write activty) are backed up faster than a large number of small files.

feks, we choose to backup our exchange on DB level instead of single mail, because its much faster to backup and with a 10GB LAN its quite fast to restore a large db as well.

/Cheers
Daniel
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by:LBC
ID: 33529239
What is your backup strategy ie what do you backup on a daily basis?

Ie do you just do RAW backups for all your servers?
or a combination of RAW plus indiviual files etc?
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by:dax_bad
ID: 33529323
Actually for the time being (until we get R15 as R12 doesnt support RAW vhd backup), we are backing up our virtual servers through the universal agent on the OS, like you are doing with the RAW file level (its basicly the same).

If the performance issue with RAW file level backup is too poor, maybe you should consider only doing RAW vhd backup, and then install a staging hyper V server for single file recoveries, where you can restore the VM to and then start and recover the files needed.

I gueses it depends on how often you actually do single file restores, we hardly ever do that on our servers, only for our file shares which are located on a NAS and backed up through ARCserves NDMP protocol.

Our general setup is Mon-Thu is incremental backup with full on fridays

we have a 300slot ADIC i500 tape library with 4 LTO3 and 2 LTO4 tape streamers, and a EMC Clariion CDL emulating an ADIC i2000 with 24 drives and 300 lots. We clone all File shares and mail data.

We backup around 40TB on a weely basis using this system.

Cheers
Daniel  
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by:dax_bad
ID: 33529330
Well actually come to think of it, R12 does have some HyperV integration, but its quite scarce, so we decided to wait for the R15 implementation and then redesign our setup then.

/Daniel
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