HP StorageWorks Modular Smart Array 1000 HP Array Configuration Utility User G - Page 55

Re-enabling a failed logical drive, Enabling or disabling the drive cache

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modify ssd=# where is a controller and # is a number between 1 and 30. This number determines the delay time in seconds, but you do not need to include units with the command. Example command: => ctrl sn=P56350D9IP903J modify ssd=3 Re-enabling a failed logical drive If a logical drive has failed and the data on it is invalid or non-recoverable, you can re-enable the logical drive so that it can be reused. This process preserves the structure of the logical drive and merely deletes data, whereas a delete command applied to a logical drive deletes the logical drive structure as well as the data. Syntax: modify reenable [forced] Example command: => ctrl slot=3 ld 1 modify reenable forced 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: modify drivewritecache=enable|disable [forced] where 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 it or re-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: modify aa=enable|disable where is a logical drive. Example command: => ctrl slot=3 ld 1 modify aa=enable Disabling a redundant controller This command disables a redundant controller that is in an Active-Standby configuration. IMPORTANT: The redundant controller cannot be re-enabled after you have disabled it. Syntax: Using the Command Line Interface 55

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Using the Command Line Interface
55
<target> modify ssd=#
where
<target>
is a controller and
#
is a number between 1 and 30. This number determines the delay
time in seconds, but you do not need to include units with the command.
Example command:
=> ctrl sn=P56350D9IP903J modify ssd=3
Re-enabling a failed logical drive
If a logical drive has failed and the data on it is invalid or non-recoverable, you can re-enable the logical
drive so that it can be reused. This process preserves the structure of the logical drive and merely deletes
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
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 it or re-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
Disabling a redundant controller
This command disables a redundant controller that is in an Active-Standby configuration.
IMPORTANT:
The redundant controller cannot be re-enabled after you have disabled it.
Syntax: