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Chapter 8

Setting the Multipaths

Two types of multipath configurations are available for the connection between the ETERNUS DX and an HP-

UX server: "PV-Links" and "Native Multipaths".

This chapter explains how to set up the "PV-Links" or "Native Multipaths".

8.1

PV-Links" is a Logical Volume Manager (LVM) function, available for all HP-UX versions.

LVM for HP-UX supplies PV-Links as a standard function for configuring paths in a redundant configuration

(path failover function).

PV-Links is set by including multiple paths connected to one physical volume in one volume group.

Only one of the paths will be set as the Active path, with the other paths being made Standby paths.

However, load on the system may be better balanced by spreading the server accesses over multiple Active

paths.

When using PV-Links, note the following:

Confirm that the PV-Links paths have identical target IDs.

•

When set correctly, the device files for all paths that connect to a given ETERNUS DX LUN should all be the

same after the "t" part of the name (e.g. "/dev/dsk/c4t0d0" g"0d0").

For HP-UX11iv3, set the "leg_mpath_enable" parameter to "false" and use LegacyDSF to specify the

•

"pv_path" parameter to create VolumeGroup.

Reference

Device special file type

Legacy DSF

Persistent DSF

Example:

Setting "leg_mpath_enable" to "false"

# scsimgr save_attr -D /dev/rdisk/disk25 -a leg_mpath_enable=false

Using LegacyDSF to specify the "pv_path" parameter to create VolumeGroup

# vgcreate vg01 /dev/dsk/c4t0d0 /dev/dsk/c6t0d0

FUJITSU Storage ETERNUS DX Configuration Guide -Server Connection- (iSCSI) for HP-UX

Example device special file

/dev/dsk/c4t0d0

/dev/rdsk/c4t0d0

/dev/disk/disk25

/dev/rdisk/disk25

P3AM-3402-14ENZ0