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RE: determine needed disk arms when replacing old disks



fixed

Jim,

If your referring to a new system, and it's production, I would go with a
5913 and a 5887 drawer. RAID-5 or RAID-6 to taste with a hot spare either
way.
Disk units: 19B1 74Y6498 300 GB 15K small form factor SAS disk drive. Plan
for RAID and Hot spare so 15 - 17 units. You'll have up to 24 drives in
that drawer. With that controller you could add another drawer of 24
without an additional controller card if you need to.

Next very strongly consider using virtual partitions. 1 primary - owns all
the hardware and two virtual partitions to run both the "business"
partitions. Saves money on hardware (only one controller etc) and works
amazingly easy. I have several customers set up this way and the
flexibility outweighs the added partition to manage.

The other option is a V3700. I would however strongly recommend VIOS to
virtualize all the resources. That adds some complexity but in the end
looks like my prior suggestion just using VIOS instead of IBM i for the
virtualization. 300GB drives there but you'll need to really carefully plan
RAID sets since V3700 is not at good at RAID as IBM i is.

In short it depends. You can do a traditional LPAR arrangement with
hardware for each partition, works and is easiest to manage but more
expensive in hardware acquisition. You can use IBM i to virtualize or VOIS.


--
Jim Oberholtzer
Chief Technical Architect
Agile Technology Architects

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of J Franz
Sent: Monday, February 10, 2014 11:34 AM
To: Midrange Systems Technical Discussion
Subject: determine needed disk arms when replacing old disks

How does one determine the number of disk arms needed when replacing old
disks in a new system config (720), and existing disks are of various sizes?

We currently have 42 disks, and they vary from 4327's (52Gb, 61Gb, 70Gb) and
4328's (105Gb and 141Gb).
We need to double current 3.2Tb (2 partition - 705Gb and 2.5Tb) I would
think we don't need 42 new SAS drives.
Jim Franz
--
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