You can customize the size of your RAID groups based on your requirements for data availability, performance, and disk utilization.
You change the size of RAID groups on a per-aggregate basis, by setting the raidsize aggregate option. You cannot change the size of individual RAID groups.
The following list outlines some facts about changing the raidsize aggregate option:
- If you increase the raidsize option, more disks or array LUNs will be added to the most recently created RAID group until it reaches the new size.
- All other existing RAID groups in that aggregate remain the same size, unless you explicitly add disks to them.
- You cannot decrease the size of already created RAID groups.
- The new size applies to all subsequently created RAID groups in that aggregate.
Enter the following command: aggr options aggr_name raidsize size
The following command changes the raidsize setting of the aggregate aggr3 to 16 disks or array LUNs:
aggr options aggr3 raidsize 16
When disks are added to an existing volume, the filer will attempt to keep the amount of data stored on each disk about equal.
By adding a minimum of three disks at a time to a volume, the throughput to disk is increased by providing more disks to write to at a given time.