Users Guide

Table 4. Read policies (continued)
Feature Description
Adaptive read ahead Adaptive read ahead is no longer supported. Selecting adaptive read ahead is equivalent to selecting
the read ahead option.
Virtual disk migration
The PERC 10 series supports migration of virtual disks from one controller to another without taking the target controller offline.
The controller can import RAID virtual disks in optimal, degraded, or partially degraded states. You cannot import a virtual disk
that is offline. When a controller detects a configured physical disk, it flags the physical disk as foreign, and generates an alert
indicating that a foreign disk was detected.
Disk migration pointers:
● Supports migration of virtual disks from PERC H330, H730, H730P, and H830 to the PERC 10 series except for PERC H345.
● Supports migration of volumes created within the PERC 10 series.
● Does not support migration from the PERC 10 series to PERC H330, H730, H730P, H830, H310, H710, H710P, H810.
● Does not support migration from PERC H310, H710, H710P, and H810 to the PERC10 series.
NOTE: The source controller must be offline prior to performing the disk migration.
NOTE: Importing non-RAID drives and uneven span RAID 10 virtual disks from PERC 9 to PERC 10 is not supported.
NOTE: Disks cannot be migrated to older generations of PERC cards.
NOTE: Importing secured virtual disks is supported as long as the appropriate local key management (LKM) is supplied or
configured.
NOTE: RAID 5, 6, 50, and 60 virtual disks cannot be imported in eHBA mode.
NOTE: Virtual disk migration from PERC H740P, H745P, H745, H840 to H345 is not supported.
CAUTION: Do not attempt disk migration during RLM or online capacity expansion (OCE). This causes loss of
the virtual disk.
Virtual disk initialization
PERC 10 series controllers support two types of virtual disk initialization:
● Full initialization
● Fast initialization
CAUTION:
Initializing virtual disks erases files and file systems while keeping the virtual disk configuration
intact.
Full initialization
Performing a full initialization on a virtual disk overwrites all blocks and destroys any data that previously existed on the virtual
disk. Full initialization of a virtual disk eliminates the need for the virtual disk to undergo a background initialization (BGI). Full
initialization can be performed after the virtual disk is created.
You can start a full initialization on a virtual disk by using the Slow Initialize option in the Dell OpenManage storage management
application. For more information on using the HII Configuration Utility to perform a full initialization, see Configuring virtual disk
parameters.
NOTE: If the system reboots during a full initialization, the operation aborts and a BGI begins on the virtual disk.
24 Features