Paul,
SANs do not inherently provide better performance than internal disk(SSDs or HDDs). They do provide flexibility and capabilities which are not available with internal disk, as you described with the migration to the v9000. One area that Storwize shines with though is EasyTier. I think this is a much better solution for mixing SSD and HDDs than what we can do internal drives on IBM i. EasyTier along with the ability to Flash Copy a partition are very beneficial.
________________________________
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxx> on behalf of Musselman, Paul <pmusselman@xxxxxxxxxxxxxxxx>
Sent: Thursday, December 6, 2018 11:54:23 AM
To: Midrange Systems Technical Discussion
Subject: RE: FC Performance vs SAS
Any disk in the new CPU? Or is everything in the SAN?
You'll never hear about it during the sales pitch, but for some reason, accessing data thru a SAN does have some overhead!
We had a V7000 with everything (including load source) in the SAN. Performance wasn't -bad-, but it didn't have that boost we were looking for. We ended up adding a Texas Memory Systems (as IBM) flash appliance. THEN things were zippy!
Now, the -real- advantage of everything in the SAN was when we migrated to a V9000- no massive save/reload! Business Partner hooked everything together and the data smoothly waltzed onto the new hardware. Nice!
Paul E Musselman
PaulMmn@xxxxxxxxxxxxx
-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxx> On Behalf Of Holger Scherer
Sent: Thursday, December 06, 2018 10:29 AM
To: Midrange-list <midrange-l@xxxxxxxxxxxx>
Subject: FC Performance vs SAS
Hi Friends,
a colleague just called me about an end user having some performance issues:
- old box: Power6 E4A, 32G RAM, 18 Disks 139GB SAS
- new box: Power7+ E1D, 128G RAM, V5000 with 8GBit FC, 24*300G 15k Disk
the new box is slower when running some old style RPG reporting program,
there is not that much I/O and V5000 box gets about 1000 I/O Sek.
If running serial operations (like save into save file) the box can do 14000 I/O
and up to 550MB/Sek.
As we do not have much customers with a small P7 and SAN - does anyone
of you have experience with these types of config?
-h
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