SCF Reference Manual for the Storage Subsystem (G06.28+, H06.05+, J06.03+)

Displaying Information about Encrypted Disks
To display information about encrypted disks, see “Displaying Information about Encrypted Disks”
(page 58).
Changing the Speed of Encryption Key Rotation
While an encryption key rotation operation is in progress, you can use the ALTER command to
change its speed.
Considerations for Changing the Speed of an Encryption Key Rotation
• The defaults are 50 for ENCRYPTRATE and 4 for ENCRYPTPRIORITY. The default values limit
potential interference with system performance.
• To speed up the encryption key rotation (even though this change might slow system
performance), increase the ENCRYPTPRIOITY value and/or increase the ENCRYPTRATE value.
• You may change these values only while an encryption key rotation is in progress. The new
values affect the ongoing encryption key rotation from the point at which you entered the new
values. They have no effect on future encryption key rotations.
Example of Changing the Speed of an Encryption Key Rotation
This command establishes an encryption priority of 6 and an encryption rate of 70:
ALTER $ENCM21-P, ENCRYPTIONPRIORITY 6, ENCRYPTRATE 70
Handling Power Failures
Hard Disk Drives (HDDs) and Solid State Drives (SSDs)
When WRITECACHE is enable, the HDD and SSD DRAM caches need to be written to disk media
after a power fail.
CAUTION: HP strongly recommends that the drive be protected by a cabinet or an HP rack
mounted UPS.
For information about caching in the event of power failure, refer to “Considerations for
WRITECACHE” (page 94).
Storage CLIMs
A Storage CLIM with the write cache enable option selected and a local HP rack mount UPS on
that rack can preserve power long enough for the cached data to be flushed to disk.
CAUTION: If the WRITECACHE disk attribute is ENABLED and there is no HP rack mounted UPS,
data in the disk cache might not be written to the disk media and you could lose data.
Handling Power Failures 117