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Re: [linux-lvm] LVM and Device Mapper



On 6/16/06, Kelly Sauke <ksauke 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
>


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