RE: performance of internal vs san for 7TB

Jim,

I run a P7-8205 with multiple LPARs.
Production is 100% SSD, excellent performance.
R&D and other LPARs are 10k spinny, 4x slower.

I use Perf Nav from MPG (disk, response time) to monitor my disk and other performance.

Historically, internal has always been faster than SAN, not sure if that has changed.

Paul

-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Jim Oberholtzer
Sent: Tuesday, June 02, 2015 9:53 AM
To: 'Midrange Systems Technical Discussion'
Subject: RE: performance of internal vs san for 7TB

Jim,

Without knowing the limits placed on internal vs. SAN disk at the DR site, I'm not sure how to approach your question. That said, SAN vs. Internal disk should perform nearly the same assuming the SAN is set up properly and the zoning is correct on the SAN switch. Without further information I'd go with the large partition on SAN and the smaller one on internal storage.
Truthfully the SAN disk may outperform the internal disk depending on spindle sizes, types of controllers, etc. In the end if it's a DR test, and the system is recovered and comes up, that's what counts, is it not?

--
Jim Oberholtzer
Chief Technical Architect
Agile Technology Architects


-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Jim Franz
Sent: Tuesday, June 02, 2015 8:35 AM
To: Midrange Systems Technical Discussion
Subject: performance of internal vs san for 7TB

We run a Power 7+ with 2 lpars, one is 1.4TB and other is 6.4TB, all internal disks (19A1 - 236GB).
Our DR provider needs to split that into internal and SAN disk (all at remote data center). How to confirm performance will be similar (or at least acceptable)? What to ask and verify? Must confirm acceptable configuration before annual test.
(switching providers is not an option)

Jim Franz
--
This is the Midrange Systems Technical Discussion (MIDRANGE-L) mailing list To post a message email: MIDRANGE-L@xxxxxxxxxxxx To subscribe, unsubscribe, or change list options,
visit: http://lists.midrange.com/mailman/listinfo/midrange-l
or email: MIDRANGE-L-request@xxxxxxxxxxxx Before posting, please take a moment to review the archives at http://archive.midrange.com/midrange-l.


--
This is the Midrange Systems Technical Discussion (MIDRANGE-L) mailing list To post a message email: MIDRANGE-L@xxxxxxxxxxxx To subscribe, unsubscribe, or change list options,
visit: http://lists.midrange.com/mailman/listinfo/midrange-l
or email: MIDRANGE-L-request@xxxxxxxxxxxx Before posting, please take a moment to review the archives at http://archive.midrange.com/midrange-l.