Re: SSA configuration question

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Date:         Fri, 24 Jun 2005 08:19:16 -0600
To: aix-l@Princeton.EDU

At the suggestion of an IBM fellow I'm looking at this redbook also.
http://www.redbooks.ibm.com/redbooks/pdfs/sg245750.pdf

There are some ssa cabling examples I'll refer to.

Mark
>>> Simon.Green@EU.ALTRIA.COM 06/24/05 2:07 am >>>
That all sounds reasonable.
I believe there's some information on that sort of configuration (RAID 0+1,
or vice versa) in one of the "LVM A to Z" Redbooks. Plus the SSA
references, of course.

And yes: the SSA adapters will load balance.

You'll probably get best performance if you keep the adapters in separate
loops. You'll have better availability, though, if they're both in the same
loops. However, SSA adapters are pretty reliable, IME.

--
Simon Green
Altria ITSC Europe s.a.r.l.

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-----Original Message-----
From: IBM AIX Discussion List [mailto:aix-l@Princeton.EDU] On Behalf Of Mark
Schlechte
Sent: 23 June 2005 14:22
To: aix-l@Princeton.EDU
Subject: SSA configuration question

(Let's try that again with a proper subject line)

>>> Mark Schlechte 06/22/05 4:16 PM >>>
Greetings,

Looking to gain a little additional SSA knowledge.
I know that's not the current IBM storage trend but we are still humming
along with our SSA here and want to SAME across 2 SSA 6225 adapters. We are
thinking of either 2 - 6 disk sets or 3 - 4 disk sets as we have 12 internal
disks.
This will be a mix of internal SSA packs and an external D40.
Laslty, this is to be used with Oracle databases.

The question is whether the SSA adapters will load balance the I/O or not.
They have the Fast Write cache on them.

Mark

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• Previous message: Holger.VanKoll_at_SWISSCOM.COM: "Re: Page datasets on SAN"
• Maybe in reply to: Mark Schlechte: "SSA configuration question"
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