Modifying the size of RAID groups

Maximum and default RAID group sizes

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

Maximum and default RAID group sizes vary according to the NetApp platform and type of RAID group protection provided. The default RAID group sizes are the sizes that NetApp generally recommends.

Maximum and default RAID DP group sizes

The following table lists the maximum RAID DP group sizes supported on Network Appliance platforms.

Platform	Maximum group size	Default group size	Minimum group size
R100	12	12	3
R150	12	12	3
R200	14	14	3
FAS250	14	7	3
All other NetApp platforms	28	16	3

Note
If as a result of a software upgrade from an older version of Data ONTAP, volumes that contain RAID 4 groups larger than the maximum 28 disks exist, NetApp recommends that you convert the volumes in question to RAID DP as soon as possible.

Maximum and default RAID 4 group sizes

The following table lists the maximum RAID 4 group sizes supported on NetApp platforms.

Platform	Maximum group size	Default group size	Minimum group size
FAS250	14	7	2
R100	8	8	2
R150	6	6	2
R200	7	7	2
All other NetApp platforms	14	8	2

Changing the size of the most recent and future RAID groups

The volume option named raidsize is the maximum RAID group size that can be reached by adding disks to a volume.

You can modify the raidsize setting upward to increase the allowable size of the most recently created RAID group. If you cannot use the raidsize setting to decrease the size of the most recently created RAID group.
The new raidsize setting also applies to subsequently created RAID groups in a volume. Either increased or decreased raidsize settings will apply to future RAID groups.
With the exception of the most recently created RAID group, existing RAID groups remain the whatever size they were before the raidsize setting was changed.

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

Step	Action
1	Enter the following command: vol options vol-name raidsize size vol-name is the volume 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 volume. Example The following command changes the `raidsize` setting of the volume yervol to 16 disks: vol options yervol raidsize 16

Step

Action

Enter the following command:

vol options vol-name raidsize size

vol-name is the volume 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 volume.

Example

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

vol options yervol raidsize 16

See Adding new disks to a RAID group and Forcibly adding disks to volumes for information about adding disks to RAID groups.

Verifying the raidsize setting

To verify the size of raidsize setting in a volume, enter the vol options vol_name command.

Modifying the size of existing RAID groups

You can use -g raidgroup option in the vol add command to increase the size of an existing RAID group. See Adding new disks to a RAID group and Forcibly adding disks to volumes for information about adding disks to existing RAID groups.