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dcampregher
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Maximum performance on a single disk

Post by dcampregher » Feb 13, 2019 5:42 pm

Hello!

If the VM have 10 VHD disks and i set the concurrent streams to 1, i can run the backup at 170MB/s. Only is possible to run at more than 170MB/s if i run two or more disks at same time.

I think that if i can run a backup up to 400MB/s with 03 disks, why i can't achieve this same performance with only one disk ?

Is there a limit on the Veeam or Windows side ? Or a metric to apply in this cases ? We are testing a scenario where the VMs have dozen of disks and in some cases the disks need to be copied in a dedicated JOB.

Mike Resseler
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Re: Maximum performance on a single disk

Post by Mike Resseler » Feb 14, 2019 6:36 am

Hi Diogo,

First: Are you also running those 03 disks with 1 concurrent task?

dcampregher
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Re: Maximum performance on a single disk

Post by dcampregher » Feb 14, 2019 9:49 am

These 03 disks with 03 concurrent tasks.

Mike Resseler
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Re: Maximum performance on a single disk

Post by Mike Resseler » Feb 15, 2019 6:30 am

Diogo,

When you are doing these 3 disks with 3 tasks, if parallel processing is enabled (and I assume so) each task will work with 1 disk to improve the total backup speed and have the time for a snapshot to be open less long. That means that with that one task you are maxing something out (most likely I think the stream of data that lands on the repository, check at the bottleneck for the job) while with 3 tasks you will have items in parallel and as long as the resources can handle it you get better results.

Makes sense?

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