From: Mark Lamport (lamport@KCMETRO.CC.MO.US)
Date: Thu Nov 13 2003 - 11:17:38 EST
It works for me on AIX 4.3.3 ML 11 and AIX 5.2 ML02, 6230 adapters, and
7133-D40 drawers.
----- Original Message -----
From: "John Jolet" <john.jolet@FXFN.COM>
Newsgroups: bit.listserv.aix-l
To: <aix-l@Princeton.EDU>
Sent: Wednesday, November 12, 2003 6:07 PM
Subject: Re: SSA cabling
> when i set up a raid 10 on ssa last time, it would not let me span
adapters with the raid, which i found odd at the time.
>
> -----Original Message-----
> From: IBM AIX Discussion List [mailto:aix-l@Princeton.EDU]On Behalf Of
> Mark Lamport
> Sent: Wednesday, November 12, 2003 5:42 PM
> To: aix-l@Princeton.EDU
> Subject: Re: SSA cabling
>
>
> If your adding a drawer and you have 2 adapters, and plan on having a raid
> 10, I would set up for redundant drawers with redundant ssa adapters so if
> any single adapter or drawer fails you system will remain running in
> degraded mode.
> Let's say you want to set up a raid 10 for 72gig and have 9 gig drives;
>
> ssa0 a1 to drawer 1 slot 1
> ssa1 a1 to drawer 2 slot 1
> ssa0 a2 to drawer 1 slot 8
> ssa1 a2 to drawer 2 slot 8
>
> Identify your pdisks via diag and then create your raid 10 array setting
the
> pdisks in drawer 1 slots 1-8 as primary and drawer 2 slots 1 -8 as
> secondary.
> Map it all out in a diagram and you will see your covered. The exception
I
> have found is if you have write cache then both ssa adapters talk to each
> other to coordinate writes and if a write cache card fails you could be
> screwed. Another key thing to keep in mind is all disks in an array must
be
> contained in 1 loop but you can have several arrays within a loop.
>
>
> Mark Lamport
>
> ----- Original Message -----
> From: "-ray" <ray@OPS.SELU.EDU>
> Newsgroups: bit.listserv.aix-l
> To: <aix-l@Princeton.EDU>
> Sent: Wednesday, November 12, 2003 3:59 PM
> Subject: 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
> > --
> > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
> > Ray DeJean http://www.r-a-y.org
> > Systems Engineer Southeastern Louisiana University
> > IBM Certified Specialist AIX Administration, AIX Support
> > =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
> >
>
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