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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Hi Everyone…<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>I have a difficult LVM question that I’m wrestling
with. Hopefully someone can help.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>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 <st1:place w:st="on"><st1:PlaceType
w:st="on">mount</st1:PlaceType> <st1:PlaceName w:st="on">LogVol02</st1:PlaceName></st1:place>
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.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>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. <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Thanks,</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'> <o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Scot Kreienkamp</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>La-Z-Boy Inc.</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
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