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Features 23
4
Exit the
BIOS Configuration Utility
and reboot the system.
5
Ensure that all the latest drivers for the
PERC H710, H710P, or H810
card
(available at
support.dell.com
) are installed.
For more information, see "Driver Installation" on page 43.
Virtual Disk Write Cache Policies
NOTE: PERC H310 only supports Write-Through mode.
The write cache policy of a virtual disk determines how the controller handles
writes to the virtual disk. Write-Back and Write-Through are the two write
cache policies and can be set on virtual disks individually.
All RAID volumes are presented as Write-Through to the operating system
(Windows and Linux) independent of the actual write cache policy of the
virtual disk (except PERC H310, which only supports Write-Back). The
PERC cards manage the data in cache independently of the operating system
or any applications.
NOTE: Use the Dell OpenManage storage management application or the BIOS
Configuration Utility to view and manage virtual disk cache settings.
Write-Back and Write-Through
In Write-Through caching, the controller sends a data transfer completion
signal to the host system when the disk subsystem has received all the data
in a transaction.
In Write-Back caching, the controller sends a data transfer completion signal
to the host 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.
The risk of using Write-Back cache is that the cached data can be lost if
there is a power failure before it is written to the storage device. This risk is
mitigated by using a Non-Volatile Cache on the PERC H710, H710P or H810
card.
NOTE: The default cache setting for virtual disks is Write-Back caching.
NOTE: Certain data patterns and configurations perform better with a
Write-Through cache policy.