Multipath Configuration Using Native Multipath; Setting The I/O Load Balance Policy (Load_Bal_Policy) - Fujitsu ETERNUS AF Configuration Manual

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

Setting the I/O Load Balance Policy (load_bal_policy)

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
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