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July 28th, 2019 17:00
Setting up Tier at LUN levels on a Dell EMC ME4024 storage
Hi
We are replacing our virtual infrastructure and have procured Dell EMC ME4024 and PowerEdge R640 Server.
10x 1.8TB HDD 10K 512e SAS12 2.5
6x 1.92TB SSD SAS Read Intensive
Is it possible to set Tier at LUN levels ?
If this is possible, will it be a good idea to set up the First LUN as SSD Tier , so that I can run SQL server application on it ( High performance application)
My SQL server VM size is 300Gb
And Second LUN as All Tier ( with Spinning disks) non-performance applications.
Also what raid levels i need to set up for the first LUN and second LUN?
Please suggest what is the best way of setting up this.
Thanks in advance.
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DMONTAGNA
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42 Posts
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July 29th, 2019 07:00
Hi,
ME4024 uses one virtual pool per controller, so, using virtual storage mode, the tiering is done at POOL level, not LUN level.
When you deploy a ME4024 the best practices is to create two virtual pools (one per controller to balance the load), since you have 6x SSD and 10x HDD, the storage will probably recommend to create one pool with 6x SSD and 4x HHD and a second pool with 6 HDD, so, you will have two tiers (performance and standard) on controller A (virtual Pool A), and only standard tier on the controller B (virtual pool B).
In your case, just be sure to create the SQL volume on Virtual Pool A to be sure the "LUN" will make I/O under the performance tier and do not forget to make the volume affinity to the performance tier.
DMONTAGNA
1 Rookie
•
42 Posts
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July 29th, 2019 07:00
ME4024 uses one virtual pool per controller, so, using virtual storage mode, the tiering is done at POOL level, not LUN level.
When you deploy a ME4024 the best practices is to create two virtual pools (one per controller to balance the load), since you have 6x SSD and 10x HDD, the storage will probably recommend to create one pool with 6x SSD and 4x HHD and a second pool with 6 HDD, so, you will have two tiers (performance and standard) on controller A (virtual Pool A), and only standard tier on the controller B (virtual pool B).
In your case, just be sure to create the SQL volume on Virtual Pool A, this way the "LUN" will make I/O under the performance tier, and also, do not forget to set the volume affinity to the performance tier.
Nirro
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November 14th, 2019 12:00
I know this is old but...
Even though it's recommended to create two pools, it's not required. You would gain cpu but the default setup is to mirror write cache so the cache wouldn't necessarily be doubled.
Tiering can be configured at a volume level as well.
What you could do is create a single pool and then for your database volume set the affinity to performance and then the other volumes can use the default tiering.