Re: lvm resizing and shifting | |
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On Sat, 2008-08-23 at 20:09 +0200, Roberto Ragusa wrote: > Craig White wrote: > > I was able to reduce the size of the logical volumes, move the logical > > volumes so they are adjacent and then reduce the size of the physical > > LVM but I cannot seem to reduce the partition itself and I'm gathering > > that this may not be possible. > > > > # pvdisplay > > --- Physical volume --- > > PV Name /dev/sda2 > > VG Name VolGroup00 > > PV Size 95.00 GB / not usable 31.81 MB > > Allocatable yes > > PE Size (KByte) 32768 > > Total PE 3039 > > Free PE 127 > > Allocated PE 2912 > > PV UUID oAYcCQ-5n28-0C6i-1LLE-voCR-E19v-SQYQK0 > > > > # fdisk -l /dev/sda > > > > Disk /dev/sda: 203.9 GB, 203928109056 bytes > > 255 heads, 63 sectors/track, 24792 cylinders > > Units = cylinders of 16065 * 512 = 8225280 bytes > > Disk identifier: 0x00086350 > > > > Device Boot Start End Blocks Id System > > /dev/sda1 * 1 13 104391 83 Linux > > /dev/sda2 14 24792 199037317+ 8e Linux LVM > > > > # df -h > > Filesystem Size Used Avail Use% Mounted on > > /dev/root 88G 54G 30G 65% / > > /dev/sda1 99M 36M 59M 39% /boot > > > > so in the end, /dev/sda2 remains approximately 200G and even the > > gpartd-liveCD cannot resize /dev/sda2 ;-( > > > > Is it even possible? > > What you are attempting is not a common way to use the LVM system. > I often create many pv on one disk (sda2, sda3, sda4) just to avoid > this kind of problems. > > The pv is now 95G, so only the first 95G of sda2 are used (usable). > Now, thinking about it, resizing sda2 could simply mean you > have to delete and immediately recreate sda2 with a smaller size. > We just have to be sure about where the pv metadata are stored. > According to > > http://www.guug.de/lokal/rhein-main/2004-09-23/LVM2_sage_23.09.pdf > > we learn that > > LVM2 format is an ASCII text format which is at the beginning, > after a disk label, of every PV in 2 copies by default > in large configurations... > > so it is at the beginning of the pv. > > The procedure I'd try (assuming I had a backup of everything, as > _this is obviously dangerous_): > > 1) Boot from CD and without any kind of lvm detection. > 2) Destroy sda2 and recreate it as 100G. > 3) Boot the system again, check that the LVM is OK and > pvresize sda2 in automatic size (so it goes from 95G to 100G). > > Step 3) avoids that you have to calculate the new size for sda2, > which is very difficult because of the partition and LVM roundings. > > If you find the courage to try this, let me know how it went. > > :-) ---- well the guinea pig wants to report - it worked ! ! ! # fdisk -l /dev/sda Disk /dev/sda: 203.9 GB, 203928109056 bytes 255 heads, 63 sectors/track, 24792 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk identifier: 0x00086350 Device Boot Start End Blocks Id System /dev/sda1 * 1 13 104391 83 Linux /dev/sda2 14 12172 97667167+ 83 Linux I have free space...(I have to go back and now and pvresize to reclaim a few gigs from the pv but the theory was terrific) Thanks Craig -- fedora-list mailing list fedora-list@xxxxxxxxxx To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list
