2010-07-01 09:19 AM
I just wiped out a shelf in hopes of adding it to another shelf to create one big aggregate for performance and space needs. From what I've seen, the way we had it setup is not the most ideal way (one aggregate per shelf).
I currently have these aggregates:
Aggr State Status Options
aggr0 online raid_dp, aggr root, nosnap=on, raidsize=18
aggr1 online raid_dp, aggr nosnap=on, raidsize=16
aggr2 online raid_dp, aggr nosnap=on, raidsize=12
aggr3 offline raid_dp, aggr raidsize=12
They're the DSM14K12 (think that's right)... the 14 drive SATA shelves. What is the proper way to do this? I see it says raidsize=12 in aggr2. Does that mean if I try and combine the drives from aggr3 it will create another raidgroup? Is this good or should I try and change the raid size first and then add the disks? Is it better to have one big aggregate/raid size or one aggregate with two raids?
Sorry if I didn't say it right, still learning the NetApp stuff.
2010-07-01 10:01 PM
Max raid group size for SATA disks is 16 (RAID_DP) with 14 being default. So there is no way to put two SATA shelves in one raid group. Depending on how much spare you want 14 or 13 would be fine IMHO (26 or 27 disks in two rg with 2 or 1 spare). If you already have spares available, go for 14 and two full shelves.
Keep in mind that max aggregate size on 7.x is 16TiB; this includes all disks in 7.2 and below and only data disks on 7.3. So look up disk size in storage management guide and compute max possible aggregate size based on it.
2010-07-02 03:01 AM
Pls go through the table below. In your case, you need to go for raid group size 13 which results in 2 RGs with 4 parity disks .
|Drive size||Drive type||Data ONTAP 7.2 and earlier||Data ONTAP 7.3|
|Spindle Count||Number of Parity Disks||Optimal RAID Group Size||Resultant RAID Groups||Spindle Count||Number of Parity Disks||Optimal RAID Group Size||Resultant RAID Groups|