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On Mon, 2007-01-22 at 10:02 -0500, Lennart Sorensen wrote:
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<FONT COLOR="#000000">Actually having / on LVM always seems like a bad idea to me (I never do</FONT>
<FONT COLOR="#000000">it). </FONT>
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I do it all the time. And I'd have /boot on LVM if Grub would support it.<BR>
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<FONT COLOR="#000000">Since the LVM config files are in /etc and being able to do any</FONT>
<FONT COLOR="#000000">kind of recovery requires access to the LVM tools (/sbin) having at</FONT>
<FONT COLOR="#000000">least that much of my system bootable even if LVM breaks (which I have</FONT>
<FONT COLOR="#000000">managed to do before when trying to use pvmove on a whole LVM at once</FONT>
<FONT COLOR="#000000">rather than individual LVs), being able to boot and have a working</FONT>
<FONT COLOR="#000000">system (although minimal) to repair it is rather handy. If / is on LVM</FONT>
<FONT COLOR="#000000">then you have essentially nothing if it breaks. You can try and get it</FONT>
<FONT COLOR="#000000">repaired using something like knoppix or such, but it will be a lot</FONT>
<FONT COLOR="#000000">harder since you still need to assemble the LVM in order to get at the</FONT>
<FONT COLOR="#000000">config files needed to assemble the LVM. </FONT>
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What about vgscan? It pulls the VG config from the VG descriptor area on the disk and reassembles volume groups.<BR>
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<FONT COLOR="#000000">Having a small / for /etc,</FONT>
<FONT COLOR="#000000">/boot, /bin and /sbin is much much safer. No need for having /boot and</FONT>
<FONT COLOR="#000000">/ seperate of course. I imagine 500M or so would do for that if /usr</FONT>
<FONT COLOR="#000000">and /var are on LVM. Might be best to actually leave /var on / too and</FONT>
<FONT COLOR="#000000">just have seperate LVs for subdirs of /var that need space (like</FONT>
<FONT COLOR="#000000">databases in /var/lib and some of the stuff in /var/log, and probablt</FONT>
<FONT COLOR="#000000">/var/spool and /var/cache). I am not entirely sure how important /var</FONT>
<FONT COLOR="#000000">might be for booting.</FONT>
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It may be safer but less convenient and it sounds messy. Now instead of efficiently using space you've got lots of spare space devoted to subdirs of /var.<BR>
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As long as you're resigned to needing a rescue disk when you have to repair LVMs then you should be okay.<BR>
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