On Fri, Feb 25, 2011 at 4:34 PM, Robert Heller <heller at deepsoft.com> wrote: > At Fri, 25 Feb 2011 15:15:34 +0200 CentOS mailing list <centos at centos.org> wrote: > >> >> I'm trying to create a 500GB lv volume on a 500GB physical volume, but can't: >> >> [root at francois-pc ~]# pvscan >> PV /dev/sdd VG freenas lvm2 [500.00 GB / 500.00 GB free] >> PV /dev/sdc VG thecus lvm2 [1010.00 GB / >> 910.00 GB free] >> PV /dev/mapper/ddf1_RAIDp2 VG VolGroup00 lvm2 [931.25 GB / 0 free] >> Total: 3 [2.38 TB] / in use: 3 [2.38 TB] / in no VG: 0 [0 ] >> [root at francois-pc ~]# lvcreate -L 500gig -n 500G freenas >> Insufficient free extents (127999) in volume group freenas: 128000 required >> >> Even dropping the size a bit, I get this: >> >> [root at francois-pc ~]# lvcreate -L 500gig -n 450G freenas >> Insufficient free extents (127999) in volume group freenas: 128000 required > > '-n' is the *name*, -L is the size. You are still asking for a 500G > sized volume. hehe, how did I miss that? Thanx for pointing it out to me. I thought I changed the size, not the name. > > Try this: > > lvcreate -l 100%FREE -n volume freenas > > This will create a logical volume (named volume) that uses all of the > *available* free space, which will be *slightly* less than the 500B of > the VG. Ok, this is kinda confusing. How could I create a 500GB volume this way, but not with specifying the actual size? [root at francois-pc ~]# lvcreate -l 100%FREE -n 500-gig freenas Logical volume "500-gig" created [root at francois-pc ~]# pvscan PV /dev/sdd VG freenas lvm2 [500.00 GB / 0 free] PV /dev/sdc VG thecus lvm2 [1010.00 GB / 1010.00 GB free] PV /dev/mapper/ddf1_RAIDp2 VG VolGroup00 lvm2 [931.25 GB / 0 free] Total: 3 [2.38 TB] / in use: 3 [2.38 TB] / in no VG: 0 [0 ] [root at francois-pc ~]# lvscan ACTIVE '/dev/freenas/500-gig' [500.00 GB] inherit ACTIVE '/dev/VolGroup00/LogVol00' [925.62 GB] inherit ACTIVE '/dev/VolGroup00/LogVol01' [5.62 GB] inherit > >> >> >> >> How do I actually create a 500GB volume? > > You can't. There is one extent's worth of space used for LVM meta data. > >> >> >> >> > > -- > Robert Heller -- 978-544-6933 / heller at deepsoft.com > Deepwoods Software -- http://www.deepsoft.com/ > () ascii ribbon campaign -- against html e-mail > /\ www.asciiribbon.org -- against proprietary attachments > > > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > http://lists.centos.org/mailman/listinfo/centos > -- Kind Regards Rudi Ahlers SoftDux Website: http://www.SoftDux.com Technical Blog: http://Blog.SoftDux.com Office: 087 805 9573 Cell: 082 554 7532