MSA2062 configuring MSA DP+ and Performance Tier

[Knaeckebrot]

Hi,

i have an 2062 again. (2 x SSD, 13 x SAS)

I will do an MSA DP+ with the 12 SAS + 1 Hotspare. I´ve read that the 2062 has an "performance tier" license for the 2 SSDs included. So i will not use SSD read cache only, but i will use SSD for r/w cache. Whats the right way to configure this?

I testet it, with dgA01 (RAID1 | 2 SSDs) an dgA02 (MSA-DP+ | 12 SAS). But i´m wondering, that the available Space is cumulating. Is that right?

Thank you

[ArunKKR · Accepted solution]

Hi,

Yes. You are correct.
Creating two separate disk groups under same Pool for SSD and SAS disks would be the correct configuration.
From MSA SMU guide:

A pool is an aggregation of one or more disk groups that serves as a container for volumes.
A disk group is a group of disks of the same type, using a specific RAID level. 
For virtual pools, when volumes are added to the pool, the data is distributed across the pool's disk groups.

Spare disks are not used by MSA-DP+ disk groups since the RAID design provides built-in spare capacity that is spread
across all disks in the disk group.
If a disk fails in an MSA-DP+ disk group and is replaced by a new disk in the same slot as the failed disk, the disk group automatically incorporates the replacement disk into the disk group.
You may expand the DP+ disk group to include 13 drives.

[ArunKKR]

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