Re: Unload/Reload

[DrFranken <midrange@xxxxxxxxxxxx>]

Each raid set can have only one physical drive size in it. As you see on 
yours the 074s show up as 'smaller' due to the parity strip being on 
those drives while the 070s show up as full capacity. In any case when 
you create a RAID5 set you lose one physical drive worth of capacity to 
the parity data.  (Aside: With RAID6 you lose two)

Yes in theory your set is a bit skewed in that only 4 drives have 
stripes while the others are all 'klingons'. The protection is not 
compromised but performance might be - a little and then mostly if one 
drive is currently failed.

That RAID card can have four RAID sets I believe (memory) so no issue 
there. Neither the controller nor the O/S will care about the 70/140/280 
thing they just do their jobs. However performance can suffer when the 
280s are tasked with four times the workload of the 70s. If your drives 
are 2 to 5% busy today it might not matter to you.  If they are 
constantly in double digits then you're going to care. Worst I ever saw 
was 2, 4, 8, 17, and 35GB Drives in the same ASP. The 35s took it on the 
chin and then when a cache battery checked out (care to guess which RAID 
set was affected??? :-) ) it got ugly bad.

 - DrF

On 9/4/2012 10:57 AM, rob@xxxxxxxxx wrote:
> Thank you.
> Can I have multiple size drives in one raid set?  Or should I start
> another raid set?  If I can have them all in one raid set should I
> end/restart raid on this set anyway to further spread the stripe?
>
> I take it multiple size drives in the same 5787 is not a problem?
>
> I'm still mulling over your other comments about the 70/140/280.
>
>
> Rob Berendt