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Hewlett-Packard 166207-B21 - Smart Array 5302/32 RAID Controller Reference Manual

Download Reference manual of HP 166207-B21 - Smart Array 5302/32 RAID Controller Adapter, Controller for Free or View it Online on All-Guides.com. This version of HP 166207-B21 - Smart Array 5302/32 RAID Controller Manual compatible with such list of devices, as: 225338-B21 - Smart Array 532 RAID Controller, ProLiant DL288, ProLiant DL360e, ProLiant DL385p, ProLiant ML350e

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HP Array Configuration Utility 73

data, whereas a delete command applied to a logical drive deletes the logical drive structure as well as

the data.

Syntax:

<target> modify reenable [forced]

Example command:

=> ctrl slot=3 ld 1 modify reenable forced

Changing the controller cache ratio

The controller cache ratio setting determines the amount of memory allocated to read and write

operations. Different types of applications have different optimum settings. You can change the ratio only

if the controller has a battery-backed cache (because only battery-backed cache can be used for write

cache) and if there are logical drives configured on the controller.

Syntax:

<target> modify cr=#/#|?

where <target> is a controller, and #/# is the cache ratio in the format read percentage/write

percentage.

Example command:

=> ctrl slot=3 modify cr=25/75

Enabling or disabling the drive cache

On controllers and drives that support physical drive write cache, you can use this command to enable or

disable the write cache for all drives on the controller.

CAUTION: Because physical drive write cache is not battery-backed, you could lose data if a

power failure occurs during a write process. To minimize this possibility, use a backup power

supply.

Syntax:

<target> modify drivewritecache=enable|disable|? [forced]

where <target> is a controller that supports drive write cache.

Example command:

=> ctrl slot=5 modify dwc=enable

Enabling or disabling the array accelerator

If the controller has an array accelerator, you can disable or enable it for specified logical drives.

NOTE: Disabling the array accelerator for a logical drive reserves use of the accelerator

cache for other logical drives on the array. This feature is useful if you want the other logical

drives to have the maximum possible performance (for example, if the logical drives contain

database information).

Syntax:

<target> modify aa=enable|disable|?

where <target> is a logical drive.

Example command:

=> ctrl slot=3 ld 1 modify aa=enable