Setting RAID level and group size

View the spare disks to know which ones are available to put in a new aggregate by entering the following command:

aggr status -s

Result

The device number, shelf number, and capacity of each spare disk on the storage system is listed.

For an aggregate, specify RAID group level and RAID group size by entering the following command:

aggr create aggr [-m] [-t {raid4|raid_dp}] 

[-r raid_group_size] disk_list

aggr is the name of the aggregate you want to create.

or

For a traditional volume, specify RAID group level and RAID group size by entering the following command:

aggr create vol [-v] [-m] [-t {raid4|raid_dp}] 

[-r raid_group_size] disk_list

vol is the name of the traditional volume you want to create.

-m specifies the optional creation of a SyncMirror-replicated volume if you want to supplement RAID protection with SyncMirror protection. A SyncMirror license is required for this feature.

-t {raid4|raid_dp} specifies the level of RAID protection (RAID4 or RAID-DP) that you want to provide. If no RAID level is specified, the default value raid_dp is applied to an aggregate or the default value raid4 is applied to a traditional volume.

RAID-DP is the default for both aggregates and traditional volumes on storage systems that support ATA disks.

-r raid-group-size is the number of disks per RAID group that you want. If no RAID group size is specified, the default value for your storage system model is applied. For a listing of default and maximum RAID group sizes, see Maximum and default RAID group sizes.

disk_list specifies the disks to include in the volume that you want to create. It can be expressed in the following formats:

• ndisks[@disk-size]

  ndisks is the number of disks to use. It must be at least 2.

  disk-size is the disk size to use, in gigabytes. You must have at least ndisks available disks of the size you specify.

• -d disk_name1 disk_name2... disk_nameN

  disk_name1, disk_name2, and disk_nameN are disk IDs of one or more available disks; use a space to separate multiple disks.

Example

The following command creates the aggregate newaggr. Since RAID-DP is the default, it does not have to be specified. RAID group size is 16 disks. Since the aggregate consists of 32 disks, those disks will form two RAID groups, rg0 and rg1:

aggr create newaggr -r 16 32@72

(Optional) To verify the RAID structure of the aggregate that you just created, enter the appropriate command:

aggr status aggr -r

Result

The parity and data disks for each RAID group in the aggregate just created are listed. In aggregates and traditional volumes with RAID-DP protection, you will see parity, dParity, and data disks listed for each RAID group. In aggregates and traditional volumes with RAID4 protection, you will see parity and data disks listed for each RAID group.

(Optional) To verify that spare disks of sufficient number and size exist on the storage system to serve as replacement disks in event of disk failure in one of the RAID groups in the aggregate that you just created, enter the following command:

aggr status -s