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[linux-lvm] LVM Mirror question



Hi Everyone…

 

I have a difficult LVM question that I’m wrestling with.  Hopefully someone can help.

 

I have two hosts with 50 gigs of local RAID5 storage.  (I am using only local storage due to performance problems with our SAN, so shared storage is out of the picture.)  I have that divided into three LVM partitions on each host, 5 gigs for /, 5 gigs for swap, and 40 gigs mounted on /var/lib/pgsql.  I need to do a real-time mirror of /var/lib/pgsql (LogVol02) to the second host.  I was trying to use LVM to do that via Network Block Device.  So on host2 I exported LogVol02 via NBD, and imported it into host1.  I then added that to VolGroup00 and used lvconvert to establish the mirror.  That all worked great.  The problem is that I don’t know how to reverse that process then and mount LogVol02 in host2 without destroying the partition, with or without NBD; the second host doesn’t have any information on the LVM partition so it wouldn’t know how to do anything with it.  That’s where I’m stuck.

 

Basically what I’m after is I need to do a real-time mirror of the postgres database volume to a second host for recovery in case of an emergency.  If there’s a way I can use LVM to do this, or if someone can suggest a better way, I’m all ears. 

 

Thanks,

 

Scot Kreienkamp

La-Z-Boy Inc.

 


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