Manually switching command devices, Manually switching command devices 26 – HP XP Continuous Access Software User Manual
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HP StorageWorks Disk Array XP RAID Manager: User’s Guide
Manually switching command devices
To avoid having commands terminate abnormally during a failure, RM has
a command device alternating function, which allows you to manually
switch devices.
• When the command device switches
When RM receives an error notification from the operating system, the
RM switches automatically to the alternate device.
You can also alternate command devices manually by issuing a RM
horcctl command. See “horcctl”
• When to issue the horcctl (alternate command device) command
Issue a horcctl command to switch command devices before a
command device is blocked due to online maintenance.
After completing online maintenance, reissue the command. The first
command device is then re-activated.
• How to define alternate command devices
You can define two or more command devices in the HORCM_CMD
section of the configuration definition file. If you specify two or more
devices on the same line, they are recognized as alternating control
devices for the same array. See “HORCM_CMD section”