2011-10-24 03:34 AM
I am expecting implementation of fas 3160A and 4 disk shelves ds4234, each with 600GB sas HDD, only block access (FC SAN)
System will be configured with ontap 8.0.2
My idea is to assign 2 shelves to filer1 and 2 shelves to filer2
Then i will have 48-3=45 free disks for data on each filer.
First idea is to create 3 aggregates per filer, existing of 15 disks per aggregate (6 aggreagtes total)
But since this is ontap 8.0.2 with support for larger aggregates, i have some ideas
First, on website i checked that 3160 supports maximum 28 disks per aggregate (http://www.netapp.com/us/products/storage-systems/fas3100/fas3100-tech-specs.html). Is this true also with ontap 8.x?
From the link i cannot see ontap version, can i assign more disks per aggregate with 8.x version on this model? And if i can, what do you think of an idea to create 2 large aggregates (one per filer)? I would get more space, but will this overload CPU's and cache on filers?
So i need some advices from your experience : 3x15 disks aggregates per filer, or larger aggregates (ofc if supported - lets say 45 disks aggregate with 2 spares)
2011-10-24 04:07 AM
one more thing :
from "storage system tehnical faq" guide i have found table as attached
So i think that optimal solution would be to create 1 aggregate per filler consisting of 45 (3 disks are for root vol) disks
in raid dp. Is raid group size of 15 good for this?
Is this OK overall?
2011-10-24 04:08 AM
Actually with 32-bit aggregates (pre-ONTAP 8 & ONTAP 8.x as well), you can have up to 33x 600GB drives in one aggregate. With 64-bit aggregates (ONTAP 8.x), you can have up to 105x 600GB drives in a single aggregate on FAS3160.
This doc explains a lot of detail around RAID group sizes, aggregate limits, spares policies, etc:
2011-10-24 04:12 AM
You've almost answered your own question!
There is no need for a dedicated root aggregate in my opinion. You do need, however, spare disks, ideally 2 per controller.
So you are good to go with:
- 45 disks, RG size 15, 3 hot spares per controller
- 46 disks, RG size 16, 2 hot spares per controller