[linux-lvm] lvcreate fails

Marcus Haarmann marcus.haarmann at midoco.de
Mon Jan 9 21:08:59 UTC 2012

Hi experts,
I have configured an external disk array on Ubuntu (amd64, 2.6.32
kernel) with lvm2 (2.02.54)
The setup is as follows:
--- Physical volume ---
  PV Name               /dev/fc_keep1a_1 (this is a symbolic link to a
fibre channel device)
  VG Name               vg_uni
  PV Size               555,23 GiB / not usable 2,20 MiB
  Allocatable           NO
  PE Size               4,00 MiB
  Total PE              142139
  Free PE               65339
  Allocated PE          76800
  PV UUID               SmOTSP-wPEd-ZruJ-XP8n-WpoL-anDN-ccG7dM
vgdisplay vg_uni
  --- Volume group ---
  VG Name               vg_uni
  System ID             
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  20
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                4
  Open LV               0
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               555,23 GiB
  PE Size               4,00 MiB
  Total PE              142139
  Alloc PE / Size       76800 / 300,00 GiB
  Free  PE / Size       65339 / 255,23 GiB
  VG UUID               0VNl5W-W22T-HEow-LvNx-gopm-nS0z-FpjZvi

This is for a database working with raw devices (without filesystem), I
allocated multiple partitions:
100 GB root
50 GB blob1
50 GB blob2
100 GB data1
When I try to allocate another area with 10 GB for a temporary space, I
get an error:
lvcreate -L 10G -n dbs_uni_tmp vg_uni
  Insufficient free space: 2560 extents needed, but only 0 available 
I did -vvv so the layout is printed (note there have been other lvm
partitions which have been dropped):
 Using cached label for /dev/fc_keep1a_1
        Using cached label for /dev/fc_keep1a_1
        Read vg_unister metadata (20) from /dev/fc_keep1a_1 at 47104
size 1723
        /dev/fc_keep1a_1 0:      0  25600: dbs_uni_root(0:0)
        /dev/fc_keep1a_1 1:  25600  25600: dbs_uni_data1(0:0)
        /dev/fc_keep1a_1 2:  51200  64000: NULL(0:0)
        /dev/fc_keep1a_1 3: 115200  12800: dbs_uni_blob1(0:0)
        /dev/fc_keep1a_1 4: 128000  12800: dbs_uni_blob2(0:0)
        /dev/fc_keep1a_1 5: 140800   1339: NULL(0:0)
    Archiving volume group "vg_unister" metadata (seqno 20).
    Creating logical volume dbs_unister_tmp
  Insufficient free space: 1338 extents needed, but only 0 available
      Unlocking /var/lock/lvm/V_vg_unister
        _undo_flock /var/lock/lvm/V_vg_unister
        Closed /dev/fc_keep1a_1

What can I do to be able to use the space ?
Thank you all for your thoughts !

Marcus Haarmann

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