New RAID-5 algorithm on V4R5 ?

[Philipp Rusch <Philipp.Rusch@xxxxxxxxxxxx>]

Hi all,

I noticed while being at a transition job from one AS/400 to another,
that there is a difference in how V4R4 and V4R5 handles disk sets on
a 2740 controller.
I used to calculate the resulting capacity when "raiding" a set of disks
on a 274x controller as a loss of about 20% of total capacity.
When working on a 620-2179 with V4R4 and 6713 disks (8.58 GB)we
got a resulting capacity of about 6400 MB each, the same disks gave
me round about 7512 MB on a system 170-2385 with V4R5 and both systems
were using a 2740 RAID controller.
Looks to me as if we have a better algorithm as before, because only
about 10% is used up for running RAID-5 on that set.

Anyone to confirm this ?


Regards from germany, Philipp Rusch


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| EDV Beratung Rusch          EDP Consulting Rusch                |
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