Hi Goeff, 
there are many things that you can do, depending on what you want. 

However, I would not be so concerned about an adapter failing, failing disks 
are much more common.

Here are some things to do/consider:
1. put each adapter on a separate PCI bus.
2. balance the disks over the adapters.
3. if you really don't care if a disk fails, use RAID 0, if the system can't go 
down use RAID 5.
4. Lately I have been using hardware RAID and LVM striping, the reliability and 
performance is very good.
5. If you are putting you TSM DB and LOG on these disks: I might not use any 
kinda of striping: JBOD or RAID 1, is probably better. Using TSM mirroring 
across SSA adapter is probably best too.
6. if your using  filesystems on these disks, use RAID and LVM striping.

Miles




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Miles Purdy 
Miles Purdy 
System Manager
Farm Income Programs Directorate
Winnipeg, MB, CA
purdym AT fipd.gc DOT ca
ph: (204) 984-1602 fax: (204) 983-7557

"If you hold a UNIX shell up to your ear, can you hear the C?"
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>>> GEOFFREY.L.GILL AT SAIC DOT COM 29-Mar-02 5:53:42 PM >>>
>>> GEOFFREY.L.GILL AT SAIC DOT COM 29-Mar-02 5:53:42 PM >>>
Hi all,

I'm working on installing a second SSA drawer in my system. I'd like any
opinions as to best connect this. What I've got is an M80 with 2 SSA
controllers, and now, 2 SSA drawers full of 36gb disks. What would be the
best way to connect this so no matter what happens to the controllers all
the disk would still be available? Is there a different solution I should
use?

Thanks for the help.

Geoff Gill
TSM Administrator
NT Systems Support Engineer
SAIC
E-Mail:    <mailto:gillg AT saic DOT com> gillg AT saic DOT com 
Phone:  (858) 826-4062
Pager:   (877) 905-7154