Hi Art,

Firstly it won't create a _serious_ performance problem. WAFL stripes across all the disks in the volume, regardsless of the number of RAID groups. Yes, you have another parity disk but you won't have "single drive seek" issues on the raid group with 1 data drive in it. Remember, we're dealing with a RAID-aware filesystem here, not dumb block-level RAID.

However, the space consumption will be an issue for you, at least until you add more drives. Most of my customers run 14 disk RAID groups (MTTDL=~95000 years for the old 18GB drive, I can't imagine it would be worse for the newer drives).

Yep, you need to backup, recreate volume and restore. Don't forget to recreate your qtrees manually before you restore.

OR, if you can temporarily borrowe another shelf from your FLNR (friendly local NetApp reseller), you can create a new volume on the other shelf and volcopy the data to and from it. Much quicker :o)

-----Original Message----- From: Art Hebert [mailto:art@arzoon.com] Sent: Tuesday, 10 December 2002 11:42 AM To: 'toasters@mathworks.com' Subject: Raid Group question

I have a current volume (vol0) that has a raidgroup size of 8. I had 3 spares that weren't being used and I wanted to add them to the volume, but like an idiot didn't check the raidgroup size. Thus when I added the 3 disks to the volume (vol0) 1 went to raidgroup 0 and the other 2 went to raidgroup 1 as a parity drive and a data drive.

This will create a performance problem from what I can tell not mention another parity drive being used.

I'd like to get these two disks back under raid group 0 if I can.

Suggestions on the best way to do this would be appreciated.

I'm thinking the safest way is to back it up and recreate the volumes and restore.

Thanks

art hebert

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