Users Guide

Non-RAID disks
A non-RAID disk is a single disk to the host, and not a RAID volume. The only supported cache policy for non-RAID disks is
Write-Through.
Physical disk power management
Physical disk power management is a power-saving feature of PERC 10 series cards. The feature allows disks to be spun down
based on disk configuration and I/O activity. The feature is supported on all rotating SAS and SATA disks, and includes
unconfigured and hot-spare disks. The physical disk power management feature is disabled by default. You can enable the
feature in the Dell Open Manage Storage Management application or in the Human Interface Infrastructure (HII) configuration
utility. For more information on HII configuration and physical disk power management, see Enabling physical disk power
management. For more information on using the Dell Open Manage Storage Management application, see the Dell OpenManage
documentation at www.dell.com/openmanagemanuals.
PERC H840 enclosure support
The H840 card is an external card. The H840 card supports:
● Up to eight enclosures using single path configuration.
● Up to four enclosure using multipath configuration.
To set up a configuration with redundant paths, both ports on a controller must be cabled to the ports of a single enclosure.
NOTE:
The PERC H840 card supports redundant paths when used with Dell PowerVault MD14XX series disk storage
enclosures.
NOTE: The Enhanced HBA mode is not supported on PERC H840.
Features 19