Les Mikesell wrote:
On Fri, 2005-10-07 at 10:54, Scot L. Harris wrote:
I know the difference between the two but I am looking at LVM groups
made from RAID1 (mdx) drives. I am assuming and hoping that the RAID
will protect the LVM as I am not losing the drive but only a copy.
That is my understanding. The raid portion will protect you from a
drive failure. The trick is to make sure you are alerted when there is
a problem and get the drive replaced.
The only question I have in such a setup is how do you grow an LVM
volume if the space was not already part of the raid group previously
setup? Do the raid tools under linux allow you to grow a raid group by
adding a drive?
I think what you do is build another RAID1 device out of two more
disks, then add the raid device to the LVM and resize the filesystem
to use the space. Does anyone have a real step-by-step to start
an LVM on top of software raid, then expand it later?
That is it. I am going to be trying it. I think I will do it sooner
than later and do a full backup before I do.
I would assume that it would be the same as just adding a single
partition as the LVM only sees the /dev/dmx, not the individual drives.
--
Robin Laing
