From: Adams Kevin J (kevin.adams@PHS.COM)
Date: Wed Feb 05 2003 - 13:03:07 EST
Maybe I'm mis-reading the question or the answer, but you can have 2
controllers in a raid5 or raid10 configuration. You can't have more than a
total of 2.
It does depend on controller model, microcode, and fastwrite cache.
I think he wants 2 controllers on 2 systems, sharing the same disks. He
can't, but he can have 1 controller on 2 systems sharing the disks.
I think that was the real question. Not can I make an array out of disks on
2 different controllers. Or did he?
Kevin Adams
-----Original Message-----
From: Jolet, John [mailto:John.Jolet@MISYSHEALTHCARE.COM]
Sent: Tuesday, February 04, 2003 7:13 PM
To: aix-l@Princeton.EDU
Subject: Re: [aix-l] RAID5 with SSA disks
you can't have a single raid cross controllers for raid 5 OR raid 10. you'd
have to set up two raid 5 hdisks, put them in the same vg, create an lv
containing them, put your stuff on one hd and mirror it to the other.
-----Original Message-----
From: BSARMA [mailto:bsarma@BASIT.COM]
Sent: Tuesday, February 04, 2003 6:32 PM
To: aix-l@Princeton.EDU
Subject: RAID5 with SSA disks
Greetings
We have our IBM RS6000s (H70) with SSA disks with HACMP 2 node Cluster
we have 2 SSA controllers in each box.
We are settingup Oracle RAC 2 node cluster for load balancing and failover.
Our application is OLTP.
We want to setup RAID5 using all the controllers (2+2), so that if
Controller1 on Server1 fails it can use Controller2 on server1 and both the
controllers take the io. Same with the other cluster.
But the IBM Service people say that we can not have 2 controllers in RAID5,
please advice.
I appreciate if you can point me towards some documentation or papers.
If this is not possilbe we would like to have Raid 0+1 and Raid5 together
some of the orale stuff (redologs, controlfiles, temporary tablespace (may
be it needs raid 0), rollback segments (undo tablespace).
All these days we have been using raid5, if we plan to use raid 0+1 are
there any plus or negative points to watch.
I have been reading the material about raid, but everybody talks as File
systems. Since We have to use RAW partitions for Oracle OPS or RAC.
I appreciate your experiences or your notes.
Regards and Thanks
BN
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