Users Guide

Probable Cause:
The controller preserves the dirty cache from a virtual disk if the disk becomes offline or is deleted because of missing physical
disks. This preserved dirty cache is called pinned cache, and is preserved until you import the virtual disk, or discard the cache.
Corrective Action:
Use the <Ctrl> <R> utility to import the virtual disk or discard the preserved cache. For the steps used to manage preserved
cache, see Managing preserved cache.
NOTE: Ctrl R is not available for systems set to UEFI boot mode. Use the HII menu to manage preserved cache in these
cases.
Managing preserved cache
About this task
If a virtual disk goes offline or is deleted because of missing physical disks, the controller preserves the dirty cache from the
virtual disk. The preserved dirty cache, known as pinned cache, is preserved until you import the virtual disk or discard the
cache.
NOTE: Certain operations, such as creating a new virtual disk, cannot be performed if preserved cache exists. You have
to enter the BIOS Configuration Utility (<Ctrl> <R>) to resolve the situation before you boot to the operating system.
Messages are displayed notifying you that you must enter the BIOS Configuration Utility (<Ctrl> <R>) to discard the
preserved cache or import the virtual disks with the preserved cache.
CAUTION: If there are any foreign configurations, it is strongly advised that you import the foreign
configuration before you discard the preserved cache. Otherwise, you might lose data that belongs with the
foreign configuration.
To manage the preserved cache:
Steps
1. On the VD Mgmt screen, click on a controller icon.
2. Press <F2> to display the available actions.
3. Select Manage Preserved Cache.
A message is displayed advising you to import the foreign configuration before you discard the preserved cache to avoid
losing data belonging to the foreign configuration. Confirm whether you want to continue. The Manage Preserved Cache
screen displays the affected virtual disks.
4. You can choose to discard the cache on the Manage Preserved Cache screen. If you press Cancel, the process is
cancelled and the Preserved Cache Retained dialog box is displayed. If you choose to discard the cache, you are prompted
to confirm your choice. If you choose to retain the cache, a message is displayed to notify you that you cannot perform
certain operations while the cache exists. Click OK to continue.
Expanding RAID array
Reconfigure or migrate a virtual disk (VDs) to increase the capacity or change the RAID level of the virtual disk. For more
information about reconfiguration of virtual disks, see Starting and target RAID levels for virtual disk reconfiguration and
capacity expansion, and Reconfiguring or migrating virtual disks.
LTO-4 Tape drives are not supported on PERC
Tape drives are not supported on PERC. Use a 6Gbps SAS HBA or an equivalent SAS HBA that is not designed with RAID.
Limitations of HDD size on H310
The PowerEdge RAID Controller H310 does not support HDD size more than 2 TB. HDD size has this limitation.
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Troubleshooting hardware issues