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[Linux-cluster] values for gnbd multipath dmsetup



Hello all,

 

We would like to use GFS and GNBD for a SAN setup, but I am having trouble setting up the multipath. Currently I have three GNBD servers mounting the storage and exporting the volumes, I read the information in the post from the previous thread but I am having trouble finding the correct values to echo into

Dmsetup, example from the thread below:

https://www.redhat.com/archives/linux-cluster/2005-April/msg00062.html

 

I found references for

> echo "0 167772160  multipath 0 0 1 1 round-robin 0 2 1 251:0 1000 251:1 1000 " | dmsetup create dm0
>  (251:0 ist the major:minor id of /dev/gnbd0)

 

I can see the major:minor blockid and the size from /sys/block/gnbd0 & gnbd1 so my  attempt looks as so:

 

> echo "0 2293981184  multipath 0 0 1 1 round-robin 0 2 1 251:0 1000 251:1 1000 " | dmsetup create dm0
>  (251:0 ist the major:minor id of /dev/gnbd0)

 

Which gives me an error of:

Device-mapper ioctl cmd 9 failed: Invalid argument

 

What am I doing wrong? Also the vaules from above specifically the “ 0 0 1 1 & 0 2 1” & “1000” from the previous post can someone clarify where these are coming from?

 

We are using a vanilla kernel-2.6.12 with from kernel.org with the cluster software from CVS stabile for 2.6.12, from the path provided at sources.redhat.com/cluster.

 

Kernel Params:

CONFIG_DM_MULTIPATH=m

 

OS=CENTOS4

 

 

 

Brian Urrutia

System Administrator

Price Communications Inc.

 


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