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RAID-5 Very good
RAID-5 with hot spare better
RAID-6 slightly better than RAID-5 with hot spare
RAID-6 with hot spare = the potential to loose the system is so small as to not matter, and almost a statistical dead heat with mirroring (although not quite as good but far, far and away less expensive)

All this assumes the big dog RAID adapters and a normal I/O footprint that's not really heavy.

Jim Oberholtzer
Chief Technical Architect
Agile Technology Architects


On 3/22/2013 2:03 PM, rob@xxxxxxxxx wrote:
My boss asked me how much disk we were using on one rack. Keep in mind
that this rack supports five lpars, only one of them is guested. My
initial thought was to do a summary of WRKSYSSTS (and whatever I had to
for that one Linux lpar), and ignore the guested lpar. After I summarized
that I thought, maybe I better count the number of each type of disk and
multiply it by the size of that disk type. You know, like 70GB times #
70GB drives, 140GB times # 140 drives, 280GB times # 280GB drives...

We have a few disks.

Turned out there was a TB difference between WRKSYSSTS and the latter
calculation. Oh well, turns out there's a bit of loss due to RAID. Sure
we all knew that but I'm glad I remember that before the boss spec'd up a
new system based on the earlier numbers. I also told him that on my minor
wish list was hot spares...


Rob Berendt
-- IBM Certified System Administrator - IBM i 6.1 Group Dekko Dept 1600 Mail to: 2505 Dekko Drive Garrett, IN 46738 Ship to: Dock 108 6928N 400E Kendallville, IN 46755 http://www.dekko.com
--

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