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Chapter 9

Setting the Multipaths

9.2

Multipath Configuration Using Native Multipath

Example:

Setting "leg_mpath_enable" to "false"

# scsimgr save_attr -D /dev/rdisk/diskX -a leg_mpath_enable=false

Execute this "leg_mpath_enable" setting command for all LUNs in the ETERNUS AF/DX.

9.2

Multipath Configuration Using Native Multipath

"Native Multipaths" is an OS function available for HP-UX11iv3 onwards.

Native Multipaths can be used to set the I/O load balance policy (load_bal_policy) and enable ALUA

(alua_enabled).

Perform these settings to match the ETERNUS AF/DX model and depending on whether the OS supports

ALUA.

9.2.1

Set the I/O load balance policy to match the ETERNUS AF/DX model being used as shown below. The policy

setting is required for all LUNs in the ETERNUS AF/DX.

I/O load balance policy setting vs ETERNUS AF/DX model

•

ETERNUS AF/DX model

ETERNUS DX60 S2

Models other than the above

Example procedure of I/O load balance policy setting

•

Setting the I/O load balance policy to "round_robin"

# scsimgr save_attr -D /dev/rdisk/disk25 -a load_bal_policy=round_robin

Execute this "load_bal_policy" setting command for all LUNs in the ETERNUS AF/DX.

If the I/O load balance policy is "preferred_path", a priority path must be set. Set the path that is used

when the I/O load is balanced as the priority path.

Example procedure priority path setting

•

Specify the hardware path of the "Lunpath" that is to be the priority path.

# scsimgr save_attr -D /dev/rdisk/disk25 -a preferred_path=

0/3/1/1.0x2041000b5d6a0109.0x0

Lunpath hardware paths can be checked using the "ioscan -m lun" and "scsimgr lun_map" commands.

The desired priority Lunpath hardware path will contain the ETERNUS AF/DX storage system's Fibre Chan-

nel port WWN.

Lunpath hardware path format

HBA_hardware_path. ETERNUS AF/DX_Fibre_Channel_port_WWN. LUN

FUJITSU Storage ETERNUS AF, ETERNUS DX Configuration Guide -Server Connection- (Fibre Channel) for HP-UX

I/O load balance policy setting

preferred_path

round_robin

P3AM-3772-22ENZ0