HP StorageWorks Modular Smart Array 1000 HP StorageWorks 1000/1500 Modular Sma - Page 34

Enabling/disabling automatic path switching

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Enabling/disabling automatic path switching NOTE: This command is available only with active/active firmware (v6.x or later). If implicit path changes are enabled, controller firmware will automatically determine and, as needed, switch controller paths for units based on host request load, according to the specified preferences. Basic command set auto_path_change [prp=#] [mnr=#] [twp=#] [twl=#] Command options enable|disable-enables or disables implicit path switching. prp-specify a proxied percentage (# = 51-100). This is the minimum percentage of proxied requests required to trigger implicit path change. mnr-specify the minimum number of requests that must be issued to the LUN before path changes are enabled (the number is rounded up to the next highest power of two). twp-specify the minimum number of minutes (0-255) to wait at power-up before changing LUN ownership. twl-specify the minimum number of minutes (0-255) to wait before changing LUN ownership again for same unit. Example command and response CLI> set auto_path_change disable Implicit (automatic load-based) LUN ownership changes are currently DISABLED. CLI> set auto_path_change enable Implicit (automatic load-based) LUN ownership changes are currently ENABLED. Implicit LUN ownership change preferences are as follows: Minimum % of proxied requests to trigger implicit path change..: 75% Minimum number of requests to LUN before path change enabled...: 65536 Minimum time to wait before changing ownership after power-up..: 30 minutes Minimum time between ownership changes for LUN 30 minutes CLI> set auto_path_change twp=15 Implicit (automatic load-based) LUN ownership changes are currently ENABLED. Implicit LUN ownership change preferences are as follows: Minimum % of proxied requests to trigger implicit path change..: 75% Minimum number of requests to LUN before path change enabled...: 65536 Minimum time to wait before changing ownership after power-up..: 15 minutes Minimum time between ownership changes for LUN 30 minutes 34 Using the CLI

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34
Using the CLI
Enabling/disabling automatic path switching
NOTE:
This command is available only with active/active firmware (v6.x or later).
If implicit path changes are enabled, controller firmware will automatically determine and, as needed,
switch controller paths for units based on host request load, according to the specified preferences.
Basic command
set auto_path_change <enable|disable> [prp=#] [mnr=#] [twp=#] [twl=#]
Command options
enable|disable
—enables or disables implicit path switching.
prp
—specify a proxied percentage (# = 51-100). This is the minimum percentage of proxied requests
required to trigger implicit path change.
mnr
—specify the minimum number of requests that must be issued to the LUN before path changes are
enabled (the number is rounded up to the next highest power of two).
twp
—specify the minimum number of minutes (0-255) to wait at power-up before changing LUN
ownership.
twl
—specify the minimum number of minutes (0-255) to wait before changing LUN ownership again
for same unit.
Example command and response
CLI> set auto_path_change disable
Implicit (automatic load-based) LUN ownership changes are currently
DISABLED.
CLI> set auto_path_change enable
Implicit (automatic load-based) LUN ownership changes are currently ENABLED.
Implicit LUN ownership change preferences are as follows:
Minimum % of proxied requests to trigger implicit path change..:
75%
Minimum number of requests to LUN before path change enabled...:
65536
Minimum time to wait before changing ownership after power-up..:
30 minutes
Minimum time between ownership changes for LUN
.................
:
30 minutes
CLI> set auto_path_change twp=15
Implicit (automatic load-based) LUN ownership changes are currently ENABLED.
Implicit LUN ownership change preferences are as follows:
Minimum % of proxied requests to trigger implicit path change..:
75%
Minimum number of requests to LUN before path change enabled...:
65536
Minimum time to wait before changing ownership after power-up..:
15 minutes
Minimum time between ownership changes for LUN
.................
:
30 minutes