[linux-lvm] New LVM2 release 2.02.89: Thinly-provisioned logical volumes

Busby.Cheung chaimvy at 163.com
Tue Jan 31 09:52:21 UTC 2012

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 at 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 at 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 at 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

 > -----原始邮件-----
> 发件人: "Alasdair G Kergon" <agk at redhat.com>
> 发送时间: 2012年1月27日 星期五
> 收件人: lvm-devel at redhat.com, linux-lvm at redhat.com, dm-devel at 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 at 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
> 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 at redhat.com
> https://www.redhat.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
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