When I configured a 997 box with a model 20 disc array it was nice when a
disc failed.  I was able to hot swap it out with out going down.

BUT......
with just 1 disc array you create a bottle-neck, you have just 1 pipeline
for data to use.  This gets ugly when you do lots of OLT and batch jobs at
the same time.

also.
when I hot swapped the bad disc, system performance crept along until the
new disc caught up with it's mirrored disc.

Just a couple of things to consider.

-----Original Message-----
From: Mark Landin [mailto:[log in to unmask]]
Sent: Monday, March 24, 2003 1:33 PM
To: [log in to unmask]
Subject: Re: [HP3000-L] Model 20 Disk array


 On Mon, 24 Mar 2003 10:32:10 -0600 (Central Standard Time), Stuart
Diamond <[log in to unmask]> wrote:

>Can someone advise if the model 20 disk array on the entire system will
work like software mirroring.  Will this replace the need for software disk
mirroring?  Sabing us a bunch of money if software costs?  It will be hot
swapable if we use J-Bods.
>
>Stu Diamond
>HP Systems Manager
>Symbol Technologies Inc.

Yes the model 20 can be used to host the MPEXL_SYSTEM_VOLUME_SET,
including LDEV 1 (boot device). This would remove the need to buy
Mirror/iX, which only works on User Volumes anyway.

It seems that some, if not all, Model 20 disk arrays are going off HP
support "soon". Be sure to verify the exact date for end-of-support
before you go investing in one.

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