Setting the preferred path mode, Disabling a redundant controller – HP Smart Storage Administrator User Manual
Page 66
Operations 66
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If you do not specify a stripe size, the CLI uses the default stripe size value for the RAID level that you
specify.
Example commands:
=> ctrl slot=3 ld 1 modify raid=1
=> ctrl slot=4 ld 2 modify ss=16
=> ctrl slot=2 ld 3 modify raid=5 ss=16
Setting the preferred path mode
The preferred path mode determines how I/O traffic to the logical drives is managed on controllers that are
in an active/active configuration.
•
In Automatic mode, the storage system automatically selects a suitable path for I/O traffic to each
logical drive depending on the host I/O patterns at the time. Because the optimum path can vary with
time, I/O traffic for any given logical drive can be directed through either controller.
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In Manual mode, all I/O traffic to a given logical drive is directed through a designated controller. In
this case, you must also specify the preferred controller for each logical drive ("
" on page
Syntax:
<target> modify [preferredpathmode=automatic|manual|?]
where <target> is a redundant controller.
Example command:
controller ch="lab 3" modify ppm=manual
Assigning a redundant controller to a logical drive
When you have set the preferred path mode ("
Setting the preferred path mode
" on page
) in a redundant
system to Manual, you must use the chassisslot command to assign each logical drive in the system to
one of the redundant controllers.
Syntax:
<target> modify [chassisslot=#|?]
where <target> is a valid logical drive on a controller that is in an active/active configuration and #
denotes the chassis slot number of the redundant controller. (To obtain the chassis slot number, use the show
command on the controller.)
Example command:
controller ch="lab 3" ld 1 modify chs=2
Disabling a redundant controller
This command disables a redundant controller that is in an Active-Standby configuration.
IMPORTANT:
The redundant controller cannot be re-enabled after you have disabled it.
Syntax:
<target> modify redundantcontroller=disable
where <target> is a controller that has an enabled redundant controller.
Example command:
=> ctrl ch="redundant Lab4" modify rc=disable