On Thu, Dec 18, 2008 at 08:23:58AM -0600, Boyd Stephen Smith Jr. wrote: > On Thursday 18 December 2008, Alex Samad <alex@samad.com.au> wrote > about 'Re: LVM reorganization': > >On Thu, Dec 18, 2008 at 01:31:18AM -0600, Boyd Stephen Smith Jr. wrote: > >[snip] > > > >> Shrinking the LV is probably the most dangerous part. You don't want > >> to > > > >1 word > > > >backup > > 3 words: > 4 TB /home I have 10 x 1Tb (raid6) on my machine, I went and bought 8x1Tb (+2x750Gb) for my backup machine, because I wanted some piece of mind for those occassions when fsck, resize and ... screw up > > I couldn't scrape together 4 TB of extra HD space right now. Even if I > could /home would just get bigger anyway. It would take more DVDs than > are in the house to backup the system, and when burning that many DVDs, > you can virtually guarantee at least one coaster. > > Sorry, it's not reasonable for me to backup each time I change my LVM > settings. It's also not really necessary, even in this case of shrinking. > After the LV is shrunk, an fsck of the filesystem should warn you if the > size of the LV is too small (IIRC, fsck.reiserfs and fsck.ext[23] do and > I've never used JFS or XFS). If you get that notice, avoid making changes > to the filesystem and instead use vgcfgrestore to roll back to the earlier > LV size. Then fsck and fix any errors; there won't be any if you > vgcfgrestored correctly and did the first fsck early enough. > > Luckily for me, I've learned that ReiserFS and LVM have the same idea > of "G" so a resize_reiserfs -s 50G followed by a lvreduce -L50G make the > filesystem and the LV the same size. I don't even always fsck the > filesystem at this point -- I know my LV is just the right size. (Since I > don't go down to single-user mode all that often, it is a good time to go > ahead and fsck all my filesystems, though.) > -- > Boyd Stephen Smith Jr. ,= ,-_-. =. > bss03@volumehost.net ((_/)o o(\_)) > ICQ: 514984 YM/AIM: DaTwinkDaddy `-'(. .)`-' > http://iguanasuicide.org/ \_/ -- Programmers do it bit by bit.
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