On Wed, 2005-08-10 at 19:11 +0200, Colin Brace wrote: > Hi all, > > I have two 200G HDs with which I would like to create is single LVM volume. > > To begin with, I created one single primary partition on each of the > drives. Here is the fdisk output: > > Disk /dev/sda: 200.0 GB, 200049647616 bytes > 255 heads, 63 sectors/track, 24321 cylinders > Units = cylinders of 16065 * 512 = 8225280 bytes > > Device Boot Start End Blocks Id System > /dev/sda1 1 24321 195358401 83 Linux > > Disk /dev/sdb: 203.9 GB, 203928109056 bytes > 255 heads, 63 sectors/track, 24792 cylinders > Units = cylinders of 16065 * 512 = 8225280 bytes > > Device Boot Start End Blocks Id System > /dev/sdb1 1 24792 199141708+ 83 Linux > > Next I ran pvcreate on each. With vgcreate I then created a groups > called "zinka" consisting of /dev/sda1 /dev/sdb1 > > Now I wanted to create a single logical volume called "films": > > lvcreate -n films -L 400G zinka > > However, lvcreate complained: > > Insufficient free extents (96310) in volume group zinka: 102400 required > > By trial and error, I discovered that I could only make a volume 376G in > size. What is happening to those other 24Gs? fdisk is giving you the size in decimal GB (i.e. 1GB = 1,000,000,000 or 10^9 bytes), whereas it would appear lvcreate is looking for binary GB, which should really be called GiB, not GB (1GiB = 1,073,741,824 or 2^30 bytes). Divide the 403.9 total GB given by fdisk by 1,073,741,824 to get GiB and you'll get 376.16GiB. -- Brian Gaynor www.pmccorp.com FC4/Linux on DELL Inspiron 5160 3.0Ghz canis 11:37:02 up 3:14, 2 users, load average: 0.26, 0.21, 0.18
