Users Guide

If full initialization of a virtual disk is performed, background initialization is not required. During full initialization, the host is
not able to access the virtual disk. If the system reboots during a full initialization, the operation terminates and a background
initialization process starts on the virtual disk.
It is always recommended to do a full initialization on drives that previously contained data. Full initialization can take up to 1-2
minutes per GB. The speed of initialization depends on the controller model, speed of hard drives, and the firmware version.
The full initialize task initializes one physical disk at a time.
NOTE: Full initialize is supported only in real-time. Only few controllers support full initialization.
Encrypting virtual disks
When encryption is disabled on a controller (that is, the security key is deleted), manually enable encryption for virtual disks
created using SED drives. If the virtual disk is created after encryption is enabled on a controller, the virtual disk is automatically
encrypted. It is automatically configured as an encrypted virtual disk unless the enabled encryption option is disabled during the
virtual disk creation.
You must have Login and Server Control privilege to manage the encryption keys.
Assigning or unassigning dedicated hot spares
A dedicated hot spare is an unused backup disk that is assigned to a virtual disk. When a physical disk in the virtual disk fails, the
hot spare is activated to replace the failed physical disk without interrupting the system or requiring your intervention.
You must have Login and Server Control privilege to run this operation.
Only T10 PI (DIF) capable physical disks can be assigned as a hot spare to T10 PI (DIF) enabled virtual disks. Any non T10 PI
(DIF) drives that are assigned as dedicated hot spare will not be a hot spare if T10 PI (DIF) is enabled on a virtual disk later on.
You can assign only 4K drives as hot spare to 4K virtual disks.
If you have assigned a physical disk as a dedicated hot spare in Add to Pending Operation mode, the pending operation is
created but a job is not created. Then, if you try to unassign the dedicated hot spare, the assign dedicated hot spare pending
operation is cleared.
If you have unassigned a physical disk as a dedicated hot spare in Add to Pending Operation mode, the pending operation is
created but a job is not created. Then, if you try to assign the dedicated hot spare, the unassign dedicated hot spare pending
operation is cleared.
NOTE:
While the log export operation is in progress, you cannot view information about dedicated hot spares on the
Manage Virtual Disks page. After the log export operation is complete, reload or refresh the Manage Virtual Disks page
to view the information.
Managing virtual disks using web interface
1. In the iDRAC web interface, go to Overview > Storage > Virtual Disks > Manage.
The Manage Virtual Disks page is displayed.
2. From the Controller drop-down menu, select the controller for which you want to manage the virtual disks.
3. For one or more Virtual Disks, from each Action drop-down menu, select an action.
You can specify more than one action for a virtual drive. When you select an action, an additional Action drop-down menu
is displayed. Select another action from this drop-down menu. The action that is already selected does not appear in the
additional Action drop-down menus. Also, the Remove link is displayed next to the selected action. Click this link to remove
the selected action.
● Delete
● Edit Policy: Read Cache — Change the read cache policy to one of the following options:
○ No Read Ahead
○ Read Ahead
○ Adaptive Read Ahead
NOTE:
Previous generations of PERC controllers support read policy settings of No Read Ahead, Read Ahead,
and Adaptive Read Ahead. With PERC 8 and PERC 9, the Read Ahead and Adaptive Read Ahead settings are
functionally equivalent at the controller level. For backward compatibility purposes, some systems management
202 Managing storage devices