On Sun, 22 Mar 2009 22:35:35 +0200 Alan McKinnon <alan.mckin...@gmail.com> wrote:
> On Sunday 22 March 2009 22:15:14 Momesso Andrea wrote: > > My current setup is: > > > > Device Boot Start End Blocks Id System > > /dev/sda1 * 1 2894 23246023+ 83 Linux > > /dev/sda2 2895 3381 3911827+ 82 Linux > > swap /Solaris > > /dev/sda3 3382 24804 172080247+ 83 Linux > > /dev/sda4 24805 30401 44957902+ 83 Linux > > > > where sda3 is an lvm volume and sda4 is free space. > > > > I'd like to to merge sda3 and sda4 into a single partition without > > losing the data on it, but I'm not sure if it is possible. > > > > My guess is that I can use fdisk to delete sda4 and sda3, create a > > sda3 partition starting at 3382 and ending at 30401, then use > > pvresize to enlarge it. > > Correct. That's all there is to it. > > > This is from man pvresize: > > "Expand the PV on /dev/sda1 after enlarging the partition with > > fdisk: pvresize /dev/sda1" > > > > Is that going to work or I'm going to lose all the data? > > Your data is safe if you do exactly the steps you said above. Good to know! In any case backups are available, but I prefer not to use them if not necessary. > > Caveat: I have no idea why this doesn't work, but if you make sda4 an > extended partition and create sda5 as a logical with exactly the same > start and end as you describe above, you do in fact lose all data. > Obviously there is a difference between a physical and a logical > partition with the same location, but I don't know why this is. > > Which is a pity, as 4 logical partitions is a little too > constrictive, I prefer the extra freedom to move things around with > extended partitions. > > > P.S. I'm not using vgextend to simply add sda4 to the lvm because I > > might want to migrate my root (sda1) to ext4, and to do so I will > > need to split it in two separate partitions (/boot using ext3 and / > > using ext4). This way I'm not going to need extended partitions. > > ext3 on /boot is pointless. The ext3 metadata takes up a considerable > chunk of the space on a typical /boot, for no good reason at all - > writes to it are exceptionally rare so there's no real-worlld benefit > to the journal. > > Ext2 is ideal for /boot. > Thanks for the advice. Will be a problem for lvm if I add a partition before it? I mean, will I need to change any config files while lvm is gonna reside on sda4 instead of sda3? --- TopperH http://topperh.blogspot.com
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