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  3. July 2020

Re: Mixing SSD & Spinny

Extraneous comment inline!



On 7/1/2020 12:24 PM, Roger Harman wrote:
One of our sister companies has a Power 8 (8286-42A - V7R1) with a mix of SSD (58B9) & Spinny (19B1) disk.

By capacity, 1/3 is SSD and 2/3 is Spinny.
By count, 11 are SSD and 28 Spinny.

I don't know how many RAID sets.
Boy, for a minute this sounded like a "when will the trains collide" algebra problem!!
Am I right in assuming that, given an even spread of data (all show 78% used), they're constrained by the spinny disks and not getting maximum benefit of the SSD's? I don't think any files are pinned to SSD.

They have performance issues, particularly at month-end, and I'm trying to get some talking points for a new Power 9 with all SSD. I think it sells itself just on the maintenance costs but need more ammunition.

Thanks.

Roger Harman
COMMON Certified Application Developer - ILE RPG on IBM i on Power








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