All in the same ASP
Thanks.
Roger Harman
COMMON Certified Application Developer - ILE RPG on IBM i on Power
--
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> on behalf of midrangel@xxxxxxxxxxxxxxxxx <midrangel@xxxxxxxxxxxxxxxxx>
Sent: Wednesday, July 1, 2020 10:45 AM
To: 'Midrange Systems Technical Discussion' <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: RE: Mixing SSD & Spinny
Roger:
It's highly likely you are correct. Usually we put the SSD and spinning
devices in separate ASPs to achieve the type of results you were looking
for.
On a SAN of course EasyTier takes care of all of that for you.
There are techniques to achieve your goals but as you mentioned, none of
them have been tried.
--
Jim Oberholtzer
Agile Technology Architects
-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of Roger
Harman
Sent: Wednesday, July 1, 2020 12:25 PM
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: Mixing SSD & Spinny
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.
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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