User`s guide

After restoring power to the system, and restarting the controllers, check

the battery status before accessing any write-back enabled units from

the operating system. The battery status must say ‘‘good,’’ unless the

CACHE_POLICY=B qualiﬁer is set. Remember that if you have the CACHE_

POLICY=B set, and you decide to use your RAIDsets or mirrorsets, you risk

losing data if power should be lost before the batteries have recharged. To

verify the status of the batteries, enter the following commands:

CLI> SHOW THIS_CONTROLLER

CLI> SHOW OTHER_CONTROLLER

If the battery status is not ‘‘good,’’ you will not be able to

access the RAIDset or mirrorset units until the batteries have

recharged unless you have the SET THIS_CONTROLLER or

SET OTHER_CONTROLLER CACHE_POLICY=B qualiﬁer set.

Note

The CACHE_POLICY=A and CACHE_POLICY=B qualiﬁers are available

for HS array controllers using ﬁrmware Version 2.5 or greater.

5.18 Using DISMOUNT or SHUTDOWN Before Moving Devices

Whenever you need to move devices to another shelf or another system, you must

ﬂush any cached data to those devices ﬁrst.

• For HSJ or HSD30 Array Controllers: If you have RAIDset or mirrorset

units, or single devices with write-back caching turned on, you must dismount

(host operating system command) the units to be moved in order to ﬂush all

data from the cache.

• For HSZ Array Controllers: If you have RAIDset or mirrorset units, or

single devices with write-back caching turned on, you may use one of the

following methods to rundown the metadata:

Use the controller SHUTDOWN command

Set NORUN on all units

Controller Operations 5–45