Changing the size of RAID groups

Maximum and default RAID group sizes

You can change the size of RAID groups that will be created on an aggregate or a traditional volume.

Maximum and default RAID group sizes vary according to the storage system and level of RAID group protection provided. The default RAID group sizes are generally recommended.

Maximum and default RAID-DP group sizes and defaults

The following table lists the minimum, maximum, and default RAID-DP group sizes supported on NetApp storage systems.

Storage system	Minimum group size	Maximum group size	Default group size
R200	3	16	14
R150	3	16	12
R100	3	12	12
Aggregates with ATA disks on other NetApp storage systems	3	16	14
All other NetApp storage systems	3	28	16

Maximum and default RAID4 group sizes and defaults

The following table lists the minimum, maximum, and default RAID4 group sizes supported on NetApp storage systems.

Storage system	Minimum group size	Maximum group size	Default group size
R200	2	7	7
R150	2	6	6
R100	2	8	8
FAS250	2	14	7
Aggregates with ATA disks on other NetApp storage systems	2	7	7
All other NetApp storage systems	2	14	8

Note
If, as a result of a software upgrade from an older version of Data ONTAP, traditional volumes exist that contain RAID4 groups larger than the maximum group size for the storage system, convert the traditional volumes in question to RAID-DP as soon as possible.

Changing the maximum size of RAID groups

The aggr option raidsize option specifies the maximum RAID group size that can be reached by adding disks to an aggregate. For backward compatibility, you can also use the vol option raidsize option when you change the raidsize option of a traditional volume's containing aggregate.

You can increase the raidsize option to allow more disks to be added to the most recently created RAID group.
The new raidsize setting also applies to subsequently created RAID groups in an aggregate. Either increasing or decreasing raidsize settings will apply to future RAID groups.
You cannot decrease the size of already created RAID groups.
Existing RAID groups remain the same size they were before the raidsize setting was changed.

Changing the raidsize setting

To change the raidsize setting for an existing aggregate, complete the following step.

Step	Action
1	Enter the following command: aggr options aggr_name raidsize size aggr_name is the aggregate whose `raidsize` setting you are changing. size is the number of disks you want in the most recently created and all future RAID groups in this aggregate. Example The following command changes the `raidsize` setting of the aggregate yeraggr to 16 disks: aggr options yeraggr raidsize 16 For backward compatibility, you can also enter the following command for traditional volumes: vol options vol_name raidsize size Example The following command changes the `raidsize` setting of the traditional volume yervol to 16 disks: vol options yervol raidsize 16

Step

Action

Enter the following command:

aggr options aggr_name raidsize size

aggr_name is the aggregate whose raidsize setting you are changing.

size is the number of disks you want in the most recently created and all future RAID groups in this aggregate.

Example

The following command changes the raidsize setting of the aggregate yeraggr to 16 disks:

aggr options yeraggr raidsize 16

For backward compatibility, you can also enter the following command for traditional volumes:

vol options vol_name raidsize size

Example

The following command changes the raidsize setting of the traditional volume yervol to 16 disks:

vol options yervol raidsize 16

For information about adding disks to existing RAID groups, see Adding disks to aggregates.

Verifying the raidsize setting

To verify the size of raidsize setting in an aggregate, enter the aggr options aggr_name command.

For backward compatibility, you can also enter the vol options vol_name command for traditional volumes.

Changing the size of existing RAID groups

If you increased the raidsize setting for an aggregate or a traditional volume, you can also use the -g raidgroup option in the aggr add command or in the vol add command to add disks to an existing RAID group. For information about adding disks to existing RAID groups, see Adding disks to a specific RAID group in an aggregate.