I need some advise. We have a new Netapp FAS2552 with Data ONTAP 8.3.1P1 which has two LUNs on raid6, one is from SAS and the second is from SSD disks.
The both LUNs are connected by multipath to couple of XenServer 6.5 over 8Gbps FC.
Everything is working great except performance of filesystems on SSD. I tried to test performance of virtual filesystems from linux and windows and the results were almost the same, so I guess the issue is not related to VM.
Google is full of ideas that everything else of raid1 or raid10 on SSD is performance disaster, but Data ONTAP allow me to create only raid4 and raid-dp (raid 6) arrays.
Do you have some advice what I missed? Thanks a lot.
Can you clarify what metric you are using to gauge performance? Throughput, IOPS, latency?
You said you tested performance of "virtual file systems from Linux and Windows and the results were almost the same". Can you describe the testing you did? This will help to determine what bottleneck might be occurring.
Lastly, it's safe to assume there are no QoS policies in place?
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I checked the SAN as well, to see the tests from other side. We have a two redundant FC switches Brocade 5450 on latest FOS 7.3.1b. I did some performance monitoring of all ports on both switches and ran the test against SAS LUN and SSD LUN.
I ran both iozone tests from VM Centos 6.7 on XenServer 6.5 on P3. The Netapp FAS2552 is on P21 and P22.
When I ran 1st test against SAS, which is LUN on aggr1 and owner is node1, you can see traffic is going through P21, which is right:
I don't know why, but XenServer or VM is able to generate traffic around 1Gbps from 8Gbps available or Netapp is able to accept only 1Gbps from 8Gbps. The servers and storage is located in one rack, I checked the BB credits and all ports has value 8. There is no Frames Busied, no Frames Rejected and zero Total Errors on all ports.
Hi, Netapp sell 2554 with SSD and when you complain about SSD performance, they said 2554 is a low end model and you should buy the higher model which has more CPU. The 2554 is limited by CPU to provide optimal performance with SSD. That is advise directly from Netapp.