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

[Busby.Cheung]

When I used a VG of 1.82TB to create a 100GB pool, it faild.
The err mesg  "cannot allocte memory",however, my host's meminfo:

[root at host2 persistent-data]# cat /proc/meminfo
MemTotal:       10234416 kB
MemFree:         9685956 kB

whether I should configure somewhere to make it work well(create bigger pool)?

This is 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   vg_pool    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      2   0   0 wz--n-   1.82T   1.82T
[root at host2 ~]# lvcreate -L 100G -T vg_pool/thin_lv 
  Ignoring too small pv_min_size 512KB, using default 2048KB.
  Rounding up size to full physical extent 4.00 MB
  device-mapper: resume ioctl on  failed: Cannot allocate memory
  Unable to resume vg_pool-thin_lv-tpool (253:15)
  Aborting. Failed to activate thin thin_lv.

 

Busby


 > -----原始邮件-----
> 发件人: "Alasdair G Kergon" <agk at redhat.com>
> 发送时间: 2012年1月31日 星期二
> 收件人: "LVM general discussion and development" <linux-lvm at redhat.com>
> 抄送: dm-devel at redhat.com, lvm-devel at redhat.com
> 主题: Re: [linux-lvm] New LVM2 release 2.02.89: Thinly-provisioned	logical volumes
> 
> On Tue, Jan 31, 2012 at 05:52:21PM +0800, Busby.Cheung wrote:
> >        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?
>   
> 
> For now, you need either 2 PVs in the VG, or use --alloc anywhere with 1 PV, or
> split the allocation manually like:
> 
> > [root at host2 ~]# lvcreate  -L100M -T vg_pool/pool -V 1T --name thin_lv /dev/sdl:0 /dev/sdl:1-
> 
> I have a patch that fixes this problem, but I'm still testing it.
> 
> Alasdair
> 
> 
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> read the LVM HOW-TO at http://tldp.org/HOWTO/LVM-HOWTO/
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