RE: Disk Upgrade

I would be very careful replacing unit 2. It may be your load source.
As for mixing sizes, it depends on the work load. It already looks like
you have 35 and 70 GB drives. Do you see those 70 GB drives hit twice
as hard as the 35's? You can replace the 4326's with 4327's and give
yourself a 25% increase in capacity. But if you have already been
running with half your drives twice the size of the other half and have
had no performance issues, then it should be safe to replace the smaller
drives with ones twice the size of the bigger ones.

The most difficult part will be ending the RAID-5 and removing one drive
so you can install a new drive to migrate your load source.




Chris Bipes
Director of Information Services
CrossCheck, Inc.


-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Ron Adams
Sent: Tuesday, November 18, 2008 7:32 AM
To: Midrange Systems Technical Discussion
Subject: Disk Upgrade

We are in need of upgrading our disk space. Below is a snapshot of our
current disk configuration.
Can I just buy a coupe of 140gig 4328 drives and replace the 4326 drives
with them?
I know I will have to stop RAID and restart and all that, but I was
wondering if it will work (and is advisable) with mixed sized drives in
the same pool.

Serial Resource
Unit Number Type Model Name Status
Unprotected
1 21-010AC46 4326 074 DD004 RAID-5/Active
2 21-010629A 4326 074 DD001 RAID-5/Active
3 21-010614C 4326 074 DD002 RAID-5/Active
4 21-0107B16 4326 074 DD003 RAID-5/Active
5 68-0D12E99 4327 078 DD009 RAID-5/Active
6 68-0CE76F8 4327 070 DD010 RAID-5/Active
7 68-0D0ED0F 4327 078 DD008 RAID-5/Active
8 68-0CDA7DE 4327 070 DD011 RAID-5/Active