Multipathing Software

Anubhav Dhingra
Frequent Advisor

Multipathing Software


We have rx8640 Server running RHEL 4.0 Update 6 , connected to EVA 6100. We dont have multipathing configured on OS and getting similar errors like below.

vgdisplay -v
vgdisplay : Found duplicate PV : using /dev/sda not /dev/sda

we have 6 vdisks presented from EVA 6100 (connected through 2 SAN switches) so we have 3 alternate paths for each Vdisks.

I am a HP-UX engineer and in that alternate paths are taken care by pv links. please suggest how to configure multipathing in Linux.
Ivan Lyanguzov
Valued Contributor

Re: Multipathing Software

Hi Anubhav!

You need to install HP DM:

Instructions on configuration can be found in Red Hat's manuals on dm-multipath.
Ivan Lyanguzov
Valued Contributor

Re: Multipathing Software

Instructions on configuration are in release notes for HP DM.
Steven E. Protter
Exalted Contributor

Re: Multipathing Software


Built in multi pathing should be sufficient. It is easy to configure and dos not require a lot of Linux skills.

Steven E Protter
Owner of ISN Corporation
dirk dierickx
Honored Contributor

Re: Multipathing Software

guide from the RH knowledge base: