Availability for the Always-On Enterprise
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rizks_2000
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Actual vs. Estimated - 60GB to 72GB

Post by rizks_2000 » Feb 24, 2010 8:11 pm

When setting up a replica job, the actual size is 60GB and then Veeam Backup is adding 20% to that for their estimated space usage. It actually does this on all jobs? Why? Seems like a high amount of storage overhead. I can see a small tad more, but why 20%?

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Re: Actual vs. Estimated - 60GB to 72GB

Post by Gostev » Feb 24, 2010 8:13 pm

Anthony, we assume daily replicas and and amount of changes equal to 10% of VMDK size. This is the estimation formula current product version is using.

rizks_2000
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Re: Actual vs. Estimated - 60GB to 72GB

Post by rizks_2000 » Feb 24, 2010 8:20 pm

so it is actually estimating and provisioning for future differential replica jobs then?

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Re: Actual vs. Estimated - 60GB to 72GB

Post by Gostev » Feb 24, 2010 8:31 pm

Yes, this additional space to host those VRB files (reversed incrementals) to enable failover to earlier point in time in cases of software corruption or virus.

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Re: Actual vs. Estimated - 60GB to 72GB

Post by Gostev » Feb 24, 2010 8:35 pm

I am actually thinking on changing 10% to 5% in the next release. Per feedback real average is about 2% daily across most VMs, so 5% might be better for most cases (except Exchange and SQL which can produce up to 30% daily disk changed due to transaction logs, but 10% is not good for this either, anyway)

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