Re: SSA cabling

From: Patrick B. O'Brien (pobrien@DOIT.NV.GOV)
Date: Wed Nov 12 2003 - 18:31:34 EST

The SSA Service Guide, contains great examples; you then get it from the horse's mouth.

-----Original Message-----
From: Adams Kevin J [mailto:kevin.adams@PHS.COM]
Sent: Wednesday, November 12, 2003 3:21 PM
To: aix-l@Princeton.EDU
Subject: Re: SSA cabling

I always try to use all the connectors by creating loops as follows:

ssa0:b2:j4----j1:b2:ssa1
ssa0:b1:j5----j8:b1:ssa1
ssa0:a2:j16---j13:a2:ssa1
ssa0:a2:j9----j12:a2:ssa1

There has been some debate as to whether you actually get more bandwidth and
thruput this way.

Kevin Adams
PacifiCare Behavioral Health
Principal Systems Analyst
AIX CATE

-----Original Message-----
From: -ray [mailto:ray@OPS.SELU.EDU]
Sent: Wednesday, November 12, 2003 1:59 PM
To: aix-l@Princeton.EDU
Subject: [aix-l] SSA cabling

All,

I'm setting up a new 7133 drawer and need some advice on cabling. Our
current drawer is connected to two adapters. 2 RAID-0 stripes, and an AIX
mirror. Is the correct cabling? It's been running in production like
this for years:

SSA1 7133 SSA2
B2 4 |-- 1 B2
           |
B1 5 | 16--| B1
           | |
A2 ---- 8 | 13 |--A2
    |-------
A1 -- 9 12 A1
        | |
        ---------------

So on the 1st adapter, A2->8, A1->1, 2nd adapter A2->16, A1->9.

For the new drawer, i'd like to do RAID-10 in hardware. It's also connect
to two separate adapters. The first config i did looks like this and
seems to work fine:

1st adapter A2->8, A1->9, 2nd adapter A2->1, A1->16.

But the "Understanding SSA Subsystems" book seems to suggest this cabling
for a "Simple loop with two adapters":

1st adapter A2->8, A1->9, 2nd adapter B2->1, B1>16.

Any advice as to which is more correct?

ray 

--
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Ray DeJean                                       http://www.r-a-y.org
Systems Engineer                    Southeastern Louisiana University
IBM Certified Specialist              AIX Administration, AIX Support
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