Rmachado wrote:Is there any official recommendation from Veeam about the use of REFS and 64k ? WE're begging a project with 60 - 80 VMS with about 90TB of Storage and 32GB of Ram
Gostev wrote:Yes, we've been in touch with the ReFS development team on this issue for a while now. Right now, they are working with one of our customers who has the issue reproducing most consistently. Internally, we do not have a lab that replicates the issue (and based on our support statistics, it does not seems to be very common in general ).
Based on my HP Hardware, 4 servers like this:
- HP DL380 Gen9 with dual CPU Intel E5-2660 v4 2Ghz, 64 GB of RAM, raid 1 SSD for the OS, and 2 NVMe 800GB disks
- Dual 10 Gbit network cards (HP 560FLR) supporting the offloading of SMB v3 (RDMA capabale)
- 2 x DAS HP D3700 with 25 x 1.8TB 12G 10K SAS disks configured as Raid 6 with HP p441 controller
I have done some storage spaces (and Storage Spaces Direct) testing, and the results were not very promising in terms of performance.
When the annonce of the licensing being Windows Server Datacenter only, we dropped the idea of ever using storage spaces direct.
So we tried to use storage spaces localy, using the NVMe disks as journal disk to improve performance.
But comparing the results using a veeam backup profile with diskspd between our p441 controller in HBA mode with storage spaces and the NVMe as journal disks (write cache for the volume) and parity for the rest of the D3700 disks, and standard Raid 6 with the p441 controller, we decided to stick with the p441 and raid 6 as it was faster and less CPU consuming.
Regarding RAM usage, this is probably due to ReFS, and you can check that with Sysinternals RAMMap.
Gostev wrote:All, here is the official KB article from Microsoft > FIX: Heavy memory usage in ReFS on Windows Server 2016 and Windows 10
Please don't forget to install KB4013429 before applying the registry values, and remember to reboot the server after doing so.
Finally, please do remember to share what option has worked for you!
Thanks for the reply. I've not opened a ticket with Veeam up to this point because I didn't think anything worthwhile could be immediately remedied by support. Would you like those of us who are having ReFS troubles to open a Veeam ticket on this issue, if we have not already done so?
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