Mike_Sphar@bmc.com writes:
I've read this and other similar documents, but it doesn't really answer my specific question. Basically:
Company purchases filer with 4 full shelves of 14 disks.
Netapp recommends 16-disk raid groups at install time.
Aggregate is created using 3 full raid groups of 16 disks, per best practices recommendations of adding full raid groups
Filer is left with 8 spares (not 7 as I incorrectly mentioned before)
My options at this point seem to be: 1) add another raid group of 6 disks or 2) leave 8 spares until some future time when capital budgets may purchase more shelves. I don't think increasing the raid group size is an option as I don't believe you can increase the size of existing already-full raid groups?
If you are using RAID_DP then 16-disk raid groups won't be the largest that ONTAP allows, will they? You can do
aggr options [name] raidsize 18
and then add two disks to each existing raid group with
aggr add [name] -f -g rg0 2 aggr add [name] -f -g rg1 2 aggr add [name] -f -g rg2 2
(always supposing you don't need to retain the ability to revert to a pre-6.2 ONTAP: see the notes about the -g option in the na_aggr man page)
Whether that's desirable or not, I'm not sure, but it should at least be possible.