Re: Strange Behavior with Added Drives?

Parity space (RAID overhead) was reserved by the first 6 drives when the set
was originally built so the RAID controller didn't need to reserve space
from the 7th & 8th drive.

No big deal and there's no problem.

You could break the RAID set and rebuild it to spread the reserved space
over all 8 drives but frankly it's a lot of effort for virtually no payoff.

On Thu, Oct 27, 2011 at 4:43 PM, Bill <brobins3d@xxxxxxxxx> wrote:

We've got a new 8202/720 that originally came with 6 drives that I
formatted to Raid 6. System's been up and running but not in production
for over a month. I decided to add another 2 to fill out the cabinet
before the unit was placed into production.

When the drives were to the system and then to the Protection Pool, they
show up with a different capacity than the original 6:

Size % I/O Request Read Write Read Unit
Type (M) Used Rqs Size (K) Rqs Rqs (K)
1 198C 93046 15.2 .0 .0 .0 .0 .0
2 198C 93046 15.2 .0 .0 .0 .0 .0
3 198C 93046 15.2 .0 .0 .0 .0 .0
4 198C 93046 15.2 .0 .0 .0 .0 .0
5 198C 93046 15.2 .0 .0 .0 .0 .0
6 198C 93046 15.2 .0 .0 .0 .0 .0
7 198C 139569 15.2 .0 .0 .0 .0 .0
8 198C 139569 15.2 .0 .0 .0 .0 .0

Everything I've read so far just notes that Raid 6 effectively removes
the capacity of 2 drives from the set, there's nothing that mentions
behavior like the above with a quantity over 6. Does the sizes reported
above make sense?

Bill


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