[dm-devel] [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
> 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 at redhat.com
> https://www.redhat.com/mailman/listinfo/linux-lvm
> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://listman.redhat.com/archives/dm-devel/attachments/20120131/0a7ba1bb/attachment.htm>
More information about the dm-devel
mailing list