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willrodbard
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Different backup speed for different VMs

Post by willrodbard » Jul 16, 2010 1:56 pm

Hi,
I am currently trying to investigate the reason why some of my VMs will backup with an effective rate of 250Mb/s and other only ever peak at about 8-10Mb/s
Came across this post and thought it might apply to me, then I remembered that my VEEAM box is a Windows Server 2003 R2 SP2 64bit server.
Now I know this could be related to the underlying storage, I am investigating vm/LUN placement at the mo as well, however if anyone could shed some light or offer any recommendations I would be grateful
Cheers
Will

Gostev
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Re: Different backup speed for different VMs

Post by Gostev » Jul 16, 2010 2:10 pm

Do you use thick or thin disks on your VMs?

Bunce
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Re: Different backup speed for different VMs

Post by Bunce » Jul 17, 2010 9:02 am

willrodbard wrote:Hi,
I am currently trying to investigate the reason why some of my VMs will backup with an effective rate of 250Mb/s and other only ever peak at about 8-10Mb/s
Will
Maybe because the current statistics offered by Veeam don't really reflect what's happening. AFAIK, the stats take into account the total size of the disks / time taken. Therefore it disregards CBT, Zero'd sectors, compression, etc.

So you may have a VM that is very active during the day, and therefore a greater change rate than another VM. Both may actually be backing-up at the same 'rate', however the current stats would indicate that the less-active VM is backing up faster..

I'm hoping there are improved job statistics in V5 which will help greatly in analysing & determining bandwidth requirements - particularly for replication over WAN links..

TrevorBell
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Re: Different backup speed for different VMs

Post by TrevorBell » Jul 17, 2010 2:26 pm

Gostev wrote:Do you use thick or thin disks on your VMs?

Anton,
Does this have a bearing on the speed of backup ?

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Re: Different backup speed for different VMs

Post by Gostev » Jul 17, 2010 7:37 pm

Sure, this would affect performance rate counter (see response from Bunce's above - covers it well).
I will split this into the new topic, as this discussion is not connected with the topic this was first posted in.

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