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3. Boot the system and import the foreign configuration that is detected. You can do one of the following:
– Press <F> to automatically import the foreign configuration.
– Enter the BIOS Configuration Utility and navigate to the Foreign Configuration View.
NOTE: For more information on accessing the BIOS Configuration Utility, see the topic Entering The BIOS
Configuration Utility.
NOTE: For more information on Foreign Configuration View, see the topic Foreign Configuration View.
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 the topic Driver Installation.
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 that 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. 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.
Conditions Under Which Write-Back Is Employed
Write-Back caching is used under all conditions in which the battery is present and in good condition.
Conditions Under Which Forced Write-Back With No Battery Is Employed
CAUTION: It is recommended that you use a power backup system when forcing Write-Back to ensure there is no
loss of data if the system suddenly loses power.
Write-Back mode is available when you select Force WB with no battery. When Forced Write-Back mode is selected,
the virtual disk is in Write-Back mode even if the battery is not present.
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