[linux-lvm] LVM and Device Mapper

[C'est Pierre]

On 6/16/06, Kelly Sauke <ksauke at fastenal.com> wrote:
> Add "a|/dev/mapper/mpath.*|" to the filter= line of your lvm.conf as such.
>
> filter = [ "a|/dev/sda2|", "a|/dev/mapper/mpath.*|", "r/.*/" ]
>
> Then make sure your types= variable has device-mapper in it.
>
>  types = [ "device-mapper", 1 ]
>
> That should be all you need.
>


Hello Kelly,

That kinda worked out. I tried your example as-is, and it still shows
'Found duplicate PV' messages and additionally it said "vg sucessfully
created" but in fact, when I issue a vgdisplay, it doesn't show the vg
created.

As soon as I changed from types = [ "device-mapper", 1 ] to types = [
"device-mapper", 16 ] as stated on lvm.conf's man page, the vgdisplay
command recognized the VG clusterfs. Soon after I tried to create a LV
on the VG clusterfs and it doesn't create the /dev/clusterfs/.* but it
does create /dev/mapper/clusterfs-ora1, however, I looked around and
found the util 'vgmknodes' and that seemed to create, however, I am
not still able to create a filesystem on it and the "Found duplicate
PV" messages still appear. Here's the output:
# vgdisplay
  Found duplicate PV 1lzBc6Ym2fFM4DPBbftbz96SkoeEA8Lh: using /dev/dm-5
not /dev/sda2
  Found duplicate PV 1lzBc6Ym2fFM4DPBbftbz96SkoeEA8Lh: using
/dev/dm-3p2 not /dev/sda2
  Found duplicate PV 1lzBc6Ym2fFM4DPBbftbz96SkoeEA8Lh: using /dev/sdb2
not /dev/sda2
  (erased the other VG)
  --- Volume group ---
  VG Name               clusterfs
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  2
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                1
  Open LV               0
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               50.00 GB
  PE Size               4.00 MB
  Total PE              12799
  Alloc PE / Size       25 / 100.00 MB
  Free  PE / Size       12774 / 49.90 GB
  VG UUID               QxEuzf-SJMU-mmlo-c4mr-6SLs-AU6X-X8A6Fi


# lvdisplay
  (skipped the others)
  --- Logical volume ---
  LV Name                /dev/clusterfs/ora1
  VG Name                clusterfs
  LV UUID                hAt2Tx-Tf2U-oD10-3W77-sIo6-Q3nf-5fG3AT
  LV Write Access        read/write
  LV Status              available
  # open                 0
  LV Size                100.00 MB
  Current LE             25
  Segments               1
  Allocation             inherit
  Read ahead sectors     0
  Block device           253:8



# mkfs.ext3  /dev/clusterfs/ora1
mke2fs 1.38 (30-Jun-2005)
mkfs.ext3: Device size reported to be zero.  Invalid partition specified, or
        partition table wasn't reread after running fdisk, due to
        a modified partition being busy and in use.  You may need to reboot
        to re-read your partition table.


Any more sugestions?

Thank you very much Kelly/Luca



> C'est Pierre wrote:
> > Hello,
> >
> > I've setup multipath with multipath-tools and I guess everything is OK
> > there. However, I can't get lvm to recognize the multipath'ed devices:
> >
> > # dmsetup ls
> > 3600508b40010130d00006000011c0000p1     (253, 4)
> > system-lv03     (253, 2)
> > system-lv01     (253, 1)
> > system-lv00     (253, 0)
> > dm-3p2  (253, 7)
> > dm-3p1  (253, 6)
> >
> > cabtagdb01:~ # fdisk -l /dev/dm-3
> >
> > Disk /dev/dm-3: 53.6 GB, 53687091200 bytes
> > 64 heads, 32 sectors/track, 51200 cylinders
> > Units = cylinders of 2048 * 512 = 1048576 bytes
> >
> >     Device Boot      Start         End      Blocks   Id  System
> > /dev/dm-3p1               1           1        1008   83  Linux
> > /dev/dm-3p2               2       51200    52427776   8e  Linux LVM
> > cabtagdb01:~ # fdisk -l /dev/mapper/3600508b40010130d00006000011c0000
> >
> > Disk /dev/mapper/3600508b40010130d00006000011c0000: 53.6 GB, 53687091200
> > bytes
> > 64 heads, 32 sectors/track, 51200 cylinders
> > Units = cylinders of 2048 * 512 = 1048576 bytes
> >
> >                                         Device Boot      Start
> > End      Blocks   Id  System
> > /dev/mapper/3600508b40010130d00006000011c0000p1               1
> >   1        1008   83  Linux
> > /dev/mapper/3600508b40010130d00006000011c0000p2               2
> > 51200    52427776   8e  Linux LVM
> >
> >
> > # pvcreate /dev/dm-3p2
> >  Device /dev/dm-3p2 not found.
> >
> > # pvcreate /dev/mapper/3600508b40010130d00006000011c0000p2
> >  Device /dev/mapper/3600508b40010130d00006000011c0000p2 not found.
> >
> > Does anyone have any guess on what the problem might be? I seem to be
> > one-step from getting this solved and I am going through these
> > hassles.
> >
> > Thank you,
> > Pierre
> >