The REMOTEDISK command allows you to mark disk units as remote disk units. You can use this command to improve performance for a mirrored set that contains some disk units that are near the system and other disk units that are farther away. Once a member is marked as a remote disk, the system avoids sending read operations to that disk, and sends the read operations to local disks instead.

The REMOTEDISK command can also be applied to non-mirrored disk units, but has no effect on the performance of such units. If the remote disk later becomes a member of a mirrored set, the system biases read operations away from that disk unit.

This REMOTEDISK specification takes effect immediately and is preserved across halt/loads.

Syntax

Explanation

REMOTEDISK PK <unit numbers>

Reports whether the specified disk units are local or remote units. If a specified unit is a member of a mirrored set, this command displays the local or remote condition for each member of the set.

REMOTEDISK + PK <unit numbers>

Marks the specified units as remote disks.

REMOTEDISK − PK <unit numbers>

Marks the specified units as local disks. This is the default setting.

Examples

Example 1

The following command marks disk unit 705 as a remote disk unit:

REMOTEDISK + PK 705

Example 2

The following command marks disk unit 710 as a local disk unit:

REMOTEDISK - PK 710