Users Guide

• Write Back — Indicates that for the given volume, the controller sends a data transfer completion signal to the host system
when the controller cache has received all the data in a transaction. The controller then writes the cached data to the storage
device in the background.
• Force Write Back — When using force write-back caching, the write cache is enabled regardless of whether the controller
has a battery. If the controller does not have a battery and force write-back caching is used, data loss may occur in the event
of a power failure.
• Edit Policy: Disk Cache — Change the disk cache policy to one of the following options:
• Default — Indicates that the disk is using its default write cache mode. For SATA disks, this is enabled and for SAS disks this
is disabled.
• Enabled — Indicates that the disk’s write cache is enabled. This increases performance and the probability of data loss if there
is power loss.
• Disabled — Indicates that the disk’s write cache is disabled. This decreases performance and the probability of data loss.
• Initialize: Fast — Updates the metadata on the physical disks so that all the disk space is available for future write operations.
The initialize option can be completed quickly because existing information on the physical disks is not erased, although future write
operations overwrites any information that remains on the physical disks.
• Initialize: Full — All existing data and file systems are erased.
NOTE:
The Initialize: Full option is not applicable for PERC H330 controllers.
• Check Consistency — To check the consistency of a virtual disk, select Check Consistency from the corresponding drop-
down menu.
NOTE:
Consistency check is not supported on drives set up in RAID0 mode.
• Encrypt Virtual Disk — Encrypts the virtual disk drive. If the controller is encryption capable, you can create, change or delete
the security keys.
NOTE:
The Encrypt Virtual Disk option is available only if the virtual disk is created using the Self-Encrypting
Drive (SED) drives.
• Manage Dedicated Hotspares — Assign or unassign a physical disk as a dedicated hot spare. Only the valid dedicated hot
spares are displayed. If there are no valid dedicated hot spares, then this section does not appear in the drop-down menu.
For more information about these options, see the iDRAC Online Help.
4. From the Apply Operation Mode drop-down menu, select when you want to apply the settings.
5. Click Apply.
Based on the selected operation mode, the settings are applied.
The other options are:
RAID Level Migration — Displays the Disk Name, Current RAID Level, and size of the virtual disk. Allows you to select a New RAID
Level. User may have to add additional drives to existing Virtual disks to migrate to new raid level. This feature is not applicable on
RAID 10, 50 and 60.
Managing virtual disks using RACADM
Use the following commands to manage virtual disks:
• To delete virtual disk:
racadm storage deletevd:<VD FQDD>
• To initialize virtual disk:
racadm storage init:<VD FQDD> -speed {fast|full}
• To check consistency of virtual disks (not supported on RAID0):
racadm storage ccheck:<vdisk fqdd>
To cancel the consistency check:
racadm storage cancelcheck: <vdisks fqdd>
• To encrypt virtual disks:
racadm storage encryptvd:<VD FQDD>
Managing storage devices
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