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yara12
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Re: Windows 2019, large REFS and deletes

Post by yara12 » Jul 13, 2019 4:34 am

However, trim/unmap have effect only on thin provisioned storages... I think.

mkretzer
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Re: Windows 2019, large REFS and deletes

Post by mkretzer » Jul 13, 2019 7:24 am

Which we do have. This might at least help a bit. But every little thing helps in our situation.

soehl
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Re: Windows 2019, large REFS and deletes

Post by soehl » Jul 13, 2019 9:37 am

mkretzer wrote:
Jun 27, 2019 5:34 pm
.... not too big volumes (the 600 Tb we have seem to be a little bit too much) was their recommendation for now.
Which size is the MS recommendation?!

Thanks!

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Re: Windows 2019, large REFS and deletes

Post by mkretzer » Jul 13, 2019 12:38 pm

There was no specific recommendation as they are just building their own bigger test systems right now. For us we will set the new limit at ~150 TB.

All the problems should happen per-volumes and not server-global.

But this seem to have one other effect: Right now we have our new system with windows server 1903 and we did first tests. If the backend storage is not fast enough REFS memory usage does not only go to ~300 GB but ~600 GB with two REFS volumes.

So more REFS volumes might benefit from (i am not sure about "need") more RAM.

Gostev
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Re: Windows 2019, large REFS and deletes

Post by Gostev » Jul 14, 2019 9:15 pm

mkretzer wrote:
Jul 13, 2019 7:24 am
[trim/unmap have effect only on thin provisioned storages] Which we do have.
Just wanted to note that Microsoft explicitly does not support thin provisioning on the storage device layer with ReFS.

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Re: Windows 2019, large REFS and deletes

Post by mkretzer » Jul 14, 2019 10:04 pm

How is the storage being thin provisioned or not relevat to the filesystem? It should have no effect on the filesystem...

Do you have a link to that information?

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Re: Windows 2019, large REFS and deletes

Post by Gostev » Jul 15, 2019 5:28 pm

https://docs.microsoft.com/en-us/window ... s-overview
Backup targets include the above supported configurations. Please contact application and storage array vendors for support details on Fiber Channel and iSCSI SANs. For SANs, if features such as thin provisioning, TRIM/UNMAP, or Offloaded Data Transfer (ODX) are required, NTFS must be used.

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