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February 19th, 2010 07:00

RAID 5 lun size.

I'm getting my first introduction to SANs on a CX3-40.  I've created a lun and I'm confused about the size.

I've created a RAID 5 lun using 10-133GB disks.  When I look at the properties of the lun, it shows raw capacity of 1006GB and User capacity of 906GB. I'd run the calculation beforehand, and was expecting something along the lines of 1197GB.

What am I missing?

9 Legend

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20.4K Posts

February 19th, 2010 19:00

did you create this LUN with the first 5 disks in DAE 0 ? Those 5 disks contain Clariion flare (Clariion operating system), so that takes up some space.

9 Legend

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20.4K Posts

February 22nd, 2010 07:00

no problem, try to avoid using the first 5 disks for anything that generates a lot of i/o.

February 22nd, 2010 07:00

That is exactly what I'm doing wrong.

Thanks!

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