[LUNI] Setting up / on an LVM
trev at advanced-reality.com
Thu Feb 10 01:47:29 CST 2005
The system I have is:
/boot on md0 (raid1)
/ on md1 (raid1)
LVM on md2 (raid1 on one system and raid5 on another)
/var, /usr, /home, /tmp on the LVM Volume
I tested it with the / on the LVM and it complicates the process of
recovering from a boot CD (unless you customize the CD). Most CDs I've
used don't load the md and lvm modules needed to activate the array and
I had to activate the array and volume group by hand. Finally, the
filter for the lvm config had to be changed to filter out the raw drive
partitions (/dev/sda5) so the volume is built off the md device.
Mistakes with this can be costly (I tanked a test raid late one night
while testing it). Having the / partition on a separate md (instead of
in an LVM volume) saves you these headaches.
I believe Martin recommended 500 Mb for the / partition and that sounds
about right. Martin also recommended having /boot and / be the same
partition. To be honest I can't think of any current reasons right now
not to do this. I have always kept /boot on a separate partition but
that may be for reasons that no longer apply (legacy BIOS issues, etc).
I need to think about that when I am a bit more awake.
Hope this helps,
On Wed, 2005-02-09 at 16:28 -0600, Jay Strauss wrote:
> Trev, I just want to make sure I understand what you are saying. Currently:
> you have /boot on a mirror (md)
> The rest of your system, including "/", on a lvg on top of a mirror (md)
> But you'd suggest, instead:
> "/" and /boot on an (md) by themselves
> and put everything else on an lvg
> Is that correct?
> If so, my next question is, how big to make the / + /boot partition
Trev Peterson <trev at advanced-reality.com>
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