User's Manual

Data in the cache may also be lost in case of unintended cable or power failure. In the event of such a failure, Storage Management preserves the data
written on the preserved or dirty cache until you recover the virtual disk or clear the cache.
This feature is available only on SAS controllers with firmware version 6.1 and later.
The status of the controller is affected by the preserved cache. The controller status is displayed as degraded if the controller has preserved cache.
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CAUTION: You may not be able to use Storage Management to manage the preserved cache in some cases. As an example, consider you have a
RAID 1 level with two disks
—
D1 and D2. If you now remove D2, the virtual disk is degraded and the data in the controller cache is written to D1.
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Manage Preserved Cache
You can discard the preserved cache only if all of the following conditions are met:
l The controller does not have any foreign configuration. Select Click for Preview to view details of the foreign configuration. See "Foreign Configuration
Operations."
l The controller does not have any offline or missing virtual disks. If there are offline or missing virtual disks, ensure you have a backup of these virtual
disks.
l Cables to any virtual disk are not disconnected.
Manage Security Key
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Does my controller support this feature? See "Supported Features."
The Manage Security Key task enables you to create a new Security Key or change/delete an existing Security Key on a security-capable controller.
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To locate this task in Storage Management, do one of the following:
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1. Select Storage in the Storage tree.
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2. On the Storage Dashboard page, select Manage Security Key... from the Available Tasks drop down menu.
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3. Click Execute.
Or:
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1. Expand the Storage tree object to display the controller objects.
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2. Select a security-capable controller object.
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3. Select the Information/Configuration subtab.
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4. Select Manage Security Key... from the Controller Tasks drop down menu.
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5. Click Execute.
If the controller is security capable and a Security Key is not present, then the Create Security Key page is displayed. Else, the Change or Delete Security
page is displayed.
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Create Security Key
To create a security key on the selected controller do the following:
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1. Enter a Security Key Identifier.
A Security Key Identifier can contain numerals, lowercase alphabets, uppercase alphabets, non-alphanumeric characters, or a combination of any of
these.
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2. Enter a Passphrase.
A Passphrase must contain at least one numeral, one lowercase alphabet, one uppercase alphabet, and one non-alphanumeric character (except
RAID 1 level with two disks—D1 and D2. If you now remove D2, the virtual disk is degraded and the data in the controller cache is written to D1.
At this point, D1 has the latest data. Now, if you re-insert D2 and pull out D1, the virtual disk will still be degraded and will not have the latest
data.
NOTE: This task is available only on PERC H800 and PERC H700 controllers.