Hi All, I tryed to use this LVM2 to create thin pool and thin lv, but it said PE was required. The VG I used is free, can anyone help me? Should any more args be needed? Is there any more detailed HowTo file than man file? The mesgs: ---------------------------- [root@host2 ~]# pvs Ignoring too small pv_min_size 512KB, using default 2048KB. PV VG Fmt Attr PSize PFree /dev/sda2 VolGroup00 lvm2 a-- 931.41G 0 /dev/sdb vg01 lvm2 a-- 931.51G 193.51G /dev/sdc vg01 lvm2 a-- 931.51G 931.51G /dev/sdd vg02 lvm2 a-- 931.51G 927.51G /dev/sdg lvm2 a-- 931.51G 931.51G /dev/sdl vg_pool lvm2 a-- 931.51G 931.51G [root@host2 ~]# vgs Ignoring too small pv_min_size 512KB, using default 2048KB. VG #PV #LV #SN Attr VSize VFree VolGroup00 1 2 0 wz--n- 931.41G 0 vg01 2 7 0 wz--n- 1.82T 1.10T vg02 1 1 0 wz--n- 931.51G 927.51G vg_pool 1 0 0 wz--n- 931.51G 931.51G [root@host2 ~]# lvcreate -L100M -T vg_pool/pool -V 1T --name thin_lv Ignoring too small pv_min_size 512KB, using default 2048KB. Rounding up size to full physical extent 4.00 MB Insufficient suitable allocatable extents for logical volume pool: 25 more required <div> </div><div> </div><div> </div><pre> > -----原始邮件----- > 发件人: "Alasdair G Kergon" <agk@redhat.com> > 发送时间: 2012年1月27日星期五 > 收件人: lvm-devel@redhat.com, linux-lvm@redhat.com, dm-devel@redhat.com > 抄送: > 主题: [linux-lvm] New LVM2 release 2.02.89: Thinly-provisioned logical volumes > > After a long break, we've issued a new LVM2 release, 2.02.89. > > 394 files changed, 22662 insertions(+), 11614 deletions(-) > > This release includes experimental support for thinly-provisioned > logical volumes using the new device-mapper thin provisioning target > in kernel 3.2. > > This is still a *development* release and the new feature is not > supported by all the LVM commands yet. > > The various interface extensions for thin provisioning are not frozen. > So we might still decide to tweak the command line extensions, library > functions, on-disk metadata extensions, tool output, configuration > options etc. in ways that make later releases incompatible with this > particular release. > > Please try it out, test it, and give us feedback preferably on the > mailing list lvm-devel@redhat.com. > > ftp://sources.redhat.com/pub/lvm2/WHATS_NEW > ftp://sources.redhat.com/pub/lvm2/WHATS_NEW_DM > > ftp://sources.redhat.com/pub/lvm2/LVM2.2.02.89.tgz > ftp://sources.redhat.com/pub/lvm2/LVM2.2.02.89.tgz.asc > > > Getting started > --------------- > > Ensure your kernel is at least version 3.2 and compiled with > DM_THIN_PROVISIONING. > > Add '--with-thin=internal' to your configure line. > You should have --enable-dmeventd too and install dmeventd for automatic > extension of nearly-full thin volumes. > > Fedora users may use this package: > lvm2-2.02.89-2.fc17 > http://koji.fedoraproject.org/koji/buildinfo?buildID=295965 > (or a newer one, if we rebuild it) > > > The basic idea > -------------- > You create a logical volume known as the "thin pool" to hold the disk > space you want to use inside your volume group. > > Then you create "thin" logical volumes which share the space in that pool. > > lvs and lvdisplay will tell you "how full" your pool is. > > dmeventd will monitor how full your pool is, and automatically use > unallocated physical extents to extend it according to the policy in > lvm.conf. Do not allow your pool to fill up! > > You can also take snapshots of thin volumes. > > There are basic examples in the man pages, and sophisticated > examples in the test scripts (e.g. test/shell/lvcreate-thin.sh). > > With lvcreate, think of -L as controlling actual disk space and -V as > controlling virtual size. -T is a short-cut indicating the use of > something thin. If not specified, volume names (like lvol0) are > generated whenever needed. > > Creating a pool needs actual disk space, so use -L. > Creating a thin volume use virtual space, so use -V. > > You can have more than one pool in a VG, so to use an existing one > you must mention which it is on the command line. > > (Of course, we will be producing additional documentation eventually.) > > Commands that should mostly work with thin volumes at this stage: > > lvcreate, lvremove, lvresize, lvextend, lvreduce, lvchange, lvdisplay, lvs > vgscan, vgdisplay, vgs, vgcreate, vgremove, vgextend, vgreduce > > Please limit yourself to those commands for now. > > Other commands have not been updated and may fail in surprising way. > (If one of them causes you problems, we're unlikely to be interested.) > > In particular, be aware that vgcfgrestore only restores the LVM metadata > and NOT the in-kernel thin metadata and so can easily cause crashes or > corruption at the moment. > > Alasdair > > _______________________________________________ > linux-lvm mailing list > linux-lvm@redhat.com > https://www.redhat.com/mailman/listinfo/linux-lvm > read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/ </pre>