Forum Discussion
Server 2019: Poor write performance on S2D two node cluster
Hi ,
Your nodes don’t comply with S2D requirements. Additionally, I would not recommend to measure performance by windows file copying, you’ll find arguments here:
https://blogs.technet.microsoft.com/josebda/2014/08/18/using-file-copy-to-measure-storage-performance-why-its-not-a-good-idea-and-what-you-should-do-instead/
Better use DiskSPD from MS.
Regarding the storage solution, you can look at virtual SAN vendors. I have a good experience of using Starwind vSAN for 2 servers cluster. The performance is better and no problem with configuration. You can find guide here:
https://www.starwindsoftware.com/resource-library/starwind-virtual-san-hyperconverged-2-node-scenario-with-hyper-v-cluster-on-windows-server-2016
MicrosoftCan you try Set-ClusterS2DDisk -CanBeClaimed:$false -PhysicalDisk $disk
Note the colon.
On the error: Set-ClusterS2DDisk : Failed to set cache mode on disks connected to node 'h11'
Have your created cache tiers manually?
Also, after running set-ClusterS2dDisk, check the Get-Disk output to see available disk.
I tried to run command using column but it still returns the same error.
PS C:\Windows\system32> $disk=get-physicaldisk -FriendlyName "*Samsung SSD*" | ? {$_.size -eq "512110190592" -and $_.deviceid -ne 0}
Set-ClusterS2DDisk -CanBeClaimed:$false -PhysicalDisk $disk
Set-ClusterS2DDisk : Failed to set cache mode on disks connected to node 'h11'. Run cluster validation, including the Storage Spaces Direct tests, to verify the configuration
At line:2 char:1
+ Set-ClusterS2DDisk -CanBeClaimed:$false -PhysicalDisk $disk
+ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ CategoryInfo : NotSpecified: (:) [Set-ClusterStorageSpacesDirectDisk], CimException
+ FullyQualifiedErrorId : HRESULT 0x8007139f,Microsoft.Management.Infrastructure.CimCmdlets.InvokeCimMethodCommand,Set-ClusterStorageSpacesDirectDisk
I enabled S2D with cache disabled (Enable-ClusterS2D -cachestate disabled)
I even did not know about cache tiers. How can I check their status? If I use Get-StorageTiers I only see my storage tier:
PS C:\Windows\system32> get-storagetier
FriendlyName TierClass MediaType ResiliencySettingName FaultDomainRedundancy Size FootprintOnPool StorageEfficiency
------------ --------- --------- --------------------- --------------------- ---- --------------- -----------------
Capacity Unknown SSD Mirror 1 0 B 0 B
MirrorOnSSD Unknown SSD Mirror 1 0 B 0 B
ssd-volume-1-MirrorOnSSD Capacity SSD Mirror 1 930 GB 1.82 TB 50.00%
Oh, I remembered I have turned deduplication on. Might be it disturbs something?
PS C:\Windows\system32> Get-DedupStatus | fl *
ObjectId : \\?\Volume{079e5b9b-7f17-4bea-bbd6-6de7bed066fd}\
Capacity : 998512787456
FreeSpace : 503428747264
InPolicyFilesCount : 13
InPolicyFilesSize : 868141497962
LastGarbageCollectionResult : 0
LastGarbageCollectionResultMessage : The operation completed successfully.
LastGarbageCollectionTime : 1/26/2019 4:39:45 AM
LastOptimizationResult : 0
LastOptimizationResultMessage : The operation completed successfully.
LastOptimizationTime : 1/28/2019 10:41:21 AM
LastScrubbingResult : 0
LastScrubbingResultMessage : The operation completed successfully.
LastScrubbingTime : 1/26/2019 4:40:48 AM
OptimizedFilesCount : 13
OptimizedFilesSavingsRate : 50
OptimizedFilesSize : 868141497962
SavedSpace : 440480093290
SavingsRate : 47
UnoptimizedSize : 935564133482
UsedSpace : 495084040192
Volume : C:\ClusterStorage\ssd-volume-1
VolumeId : \\?\Volume{079e5b9b-7f17-4bea-bbd6-6de7bed066fd}\
PSComputerName :
CimClass : ROOT/Microsoft/Windows/Deduplication:MSFT_DedupVolumeStatus
CimInstanceProperties : {Capacity, FreeSpace, InPolicyFilesCount, InPolicyFilesSize...}
CimSystemProperties : Microsoft.Management.Infrastructure.CimSystemProperties