At Sat, 9 Jan 2010 08:17:11 -0500 CentOS mailing list <centos at centos.org> wrote: > > On Fri, Jan 08, 2010 at 11:02:12PM -0500, Robert Heller wrote: > > At Fri, 8 Jan 2010 22:40:21 -0500 CentOS mailing list <centos at centos.org> wrote: > > > Now I've moved those 5 disks onto a CentOS5 machine and the RAID array > > > is being rebuilt. However the LVM structures weren't detected at boot > > > time. I was able to "vgscan" and 'vgchange -a y' to bring the volume > > > online and then fsck the logical volumes. > > > > > > But I was concerned this didn't happen at boot time. Do I need to do > > > anything else, or have the commands I've run done sufficient? > > > > > > FWIW, this machine has no other LVM (nor RAID) disks on it. > > > > This is why. Unless the machine 'knows' to look for LVM (eg has the > > mumble mumble in /etc/lvm/), it wouldn't look for it during start up. And > > unless it's root file system is on LVM its initrd won't have the > > "vgscan" and 'vgchange -a y' commands in the init script. > > So what's the fix? How do I get the right "mumble mumble"? :-) You do a "vgscan" and 'vgchange -a y' manually. This should put the right stuff in /etc/lvm/. It is rare/unusual to 'add' LVM volumns to a running system from some 'outside' source (as you did via a disk transplant). Linux installers will do the "vgscan" and 'vgchange -a y' during the install process and vgcreate updates /etc/lvm/, so the problem rarely comes up. > > Thanks! > > > > (only 5 more hours for the rebuild to complete!) > > > > > > > And hopefully, you won't get a disk error in the those errors and lose > > the whole array. > > % cat /proc/mdstat > Personalities : [raid6] [raid5] [raid4] > md3 : active raid5 sdf1[4] sde4[3] sdd3[2] sdc2[1] sdb1[0] > 3907039744 blocks level 5, 64k chunk, algorithm 2 [5/5] [UUUUU] > > unused devices: <none> > > No problem :-) > -- Robert Heller -- 978-544-6933 Deepwoods Software -- Download the Model Railroad System http://www.deepsoft.com/ -- Binaries for Linux and MS-Windows heller at deepsoft.com -- http://www.deepsoft.com/ModelRailroadSystem/