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411
May 16th, 2022 01:00
ME4024 Tiering not working?
Hello,
I have a ME4024, in Pool A with 2 disk groups.
First disk group with 10*2.4TB SAS 10k
Second disk group is now added with 16*1.92TB SSD
Both Raid6.
Tier Affinity of the Volumes from this Pool is set to Performance.
Storage is used for ESXi 6.7 only.
The issue I now have: all data is placed on the SAS disks, and the SSD are not used. Even if I create a new Volume/VMFS and migrate a few VMs to that new VMFS the data is placed on the SAS disks.
Why is the ME4024 avoid using the SSDs?
As far as I understand the Adminguide the SAN should also start to move the data from SAS to SSD since there is enough free space to hold all data, and also place all new data to the SSDs only?
Do I need to remove the SAS disk group from Pool A to get the full benefit of the SSD performance?
DELL-Chris H
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May 16th, 2022 06:00
Haukeee,
Would you confirm a couple things for me?
What firmware version is the enclosure?
What is the status showing for the Disk Group?
What is the status showing for each of the SSD drives?
What is the Raid status showing?
Let me know what you see.
Haukeee
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May 17th, 2022 02:00
Hello,
Firmware is GT280R008-04.
Status is OK for everything, no shown errors.
Storage Information for Storage A is currently showing 106GB allocated for Performance Tier (SSD) and 5148GB Allocated for Standard Tier (the SAS 10k).
I changed Tier Affinity from Performance to "No Affinity".
For me it looks like the ME4 is placing all incoming data to the SAS 10k disk group, and only heavy used blocks are moved to the SSD's.
And there is no way to redirect all data to the SSD's first until it's full?
DELL-Erman O
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May 17th, 2022 04:00
Hello, you can use ME4 as Linear or Virtual mode and for tiering use I'm guessing you are using it as Virtual mode. Among the 3 options you can choose in Tiering, the SSDs will be more prominent, the "No Affinity" option, and I understand that the tiering process works properly when you choose this. As far as I know, less used data blocks are moved to the lower tiers, and the more frequently used blocks are moved to the faster upper tiers. While tiering is used, all information will not be on SSDs.(if it is not All-Flash-Array) Data distribution takes place according to frequency of use and one of the 3 selected settings. The working status after selecting No Affinity seems fine to me.