HP-UX 11i v3 Native Multi-Pathing for Mass Storage (August 2012)

Total I/Os processed = 73880

Total I/Os processed = 73780

Configuring automatic path recovery

By default, failed lunpath automatic recovery uses the basic ping and immediate path recovery

policies. This section gives examples of how you can change the default configuration to meet

requirements for different use cases.

The following settable attributes control how automatic path recovery is performed. For more

information, see scsimgr_esdisk(7).

• ping_type — Path ping policy (none, basic, or extended)

• ping_recovery — Path recovery policy (immediate, count-based, or time-based)

• ping_count_threshold — Minimum number of successful pings before the path is considered

back online (if ping recover policy is count-based).

• ping_time_threshold — Minimum time in seconds pings must consistently succeed before the

path is considered back online.

Note

Valid for the HP-UX 11i v3 March 2008 release and later.

Disabling automatic path recovery

To disable automatic path recovery for disk16, enter the following command:

# scsimgr set_attr –D /dev/rdisk/disk16 -a ping_type=none

Value of attribute ping_type set successfully

Configuring extended path ping

The following example shows how to configure extended path ping for all disk devices with the same

vendor identifier as disk17. For that purpose, the user has registered a settable attribute scope for

disk devices with the appropriate vendor identifier and set the ping_type attribute for this scope.

1. Determine the settable attribute scope name as follows:

# scsimgr ddr_name -D /dev/rdisk/disk17 vid

SETTABLE ATTRIBUTE SCOPE

"/escsi/esdisk/0x0/COMPAQ "

2. Register the settable attribute scope name if it is not yet registered, as follows:

# scsimgr ddr_add -N "/escsi/esdisk/0x0/COMPAQ "

scsimgr:WARNING: Adding a settable attribute scope may impact system operation if some

attribute values are changed at this scope.

Do you really want to continue? (y/n)? y

scsimgr: DDR entry '/escsi/esdisk/0x0/COMPAQ ' added successfully

3. Change the value of the ping_type attribute to extended for

/escsi/esdisk/0x0/COMPAQ, as follows:

# scsimgr set_attr –N “/escsi/esdisk/0x0/COMPAQ " -a ping_type=extended

Value of attribute ping_type set successfully

Setting a count-based deferred path recovery policy

The following example shows how to consider failed lunpaths of disk17 to be back online only after

20 successful pings. The example assumes the ping_type attribute is already set to basic or

extended for disk17.