Re: Advice on what dmsetup/fdisk/lvm does!

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On 13/10/09 18:33, Dan Track wrote:

sda and sdb are the same, as there is only one disk but two separate
paths to it, so it shows up twice under different device mappings.

My question now is after restarting mutlipathd, what is the next step?

Do I need to use dmsetup, searching the web I still can't understand
why I need it.

I'm looking to create a logical volume on this disk. Once multipath is
working should I only see one entry in /proc/partitions, instead of
/dev/sda and /dev/sdb?

Posting your configuration file will probably help, but you don't need to touch /dev/sda or /dev/sdb. There should be an entry under /dev/mapper (eg /dev/mapper/SANVOL) or whatever you called it, which is the device you use to create the filesystems, logical volumes, partitions etc. You'll still see /dev/sda and /dev/sdb in /proc/partitions though.

It's also recommended you exclude lvm (/etc/lvm/lvm.conf) from looking at /dev/sda and /dev/sdb, otherwise there's the potential to confuse it.



--
Ian Chapman.

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