[DRBD-user] How to convert existing lvm2 filesystem to use drbd

Bernie Wu Bernard_Wu at ncci.com
Wed Aug 18 21:10:21 CEST 2010


Hi Listers,
We currently have one guest with an existing VG ( vgora_dbms ) with 2 LV's ( lvdbms01 and lvdbms02 ) and some free space.  Before I create another guest with identical VG attributes, I would like to convert the current VG to be used and controlled by drbd.
My listing of vgdisplay  and /etc/drbd.conf follows:

# vgdisplay -v vgora_dbms
    Using volume group(s) on command line
    Finding volume group "vgora_dbms"
  --- Volume group ---
  VG Name               vgora_dbms
  System ID
  Format                lvm2
  Metadata Areas        2
  Metadata Sequence No  3
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                2
  Open LV               0
  Max PV                0
  Cur PV                2
  Act PV                2
  VG Size               44.98 GB
  PE Size               4.00 MB
  Total PE              11516
  Alloc PE / Size       10240 / 40.00 GB
  Free  PE / Size       1276 / 4.98 GB
  VG UUID               cNHE4P-v5Kj-H208-9NyQ-h80D-yuT8-aBA3JX

  --- Logical volume ---
  LV Name                /dev/vgora_dbms/lvdbms01
  VG Name                vgora_dbms
  LV UUID                Pud0a0-pVfZ-GmE2-d2hp-8Zg7-Mcls-YvsopX
  LV Write Access        read/write
  LV Status              available
  # open                 0
  LV Size                20.00 GB
  Current LE             5120
  Segments               1
  Allocation             inherit
  Read ahead sectors     0
  Block device           253:2

  --- Logical volume ---
  LV Name                /dev/vgora_dbms/lvdbms02
  VG Name                vgora_dbms
  LV UUID                MnPYDM-tAUT-f1w3-m52o-pXnX-66jx-2sm16U
  LV Write Access        read/write
  LV Status              available
  # open                 0
  LV Size                20.00 GB
  Current LE             5120
  Segments               1
  Allocation             inherit
  Read ahead sectors     0
  Block device           253:3

  --- Physical volumes ---
  PV Name               /dev/dasdg1
  PV UUID               OkAxDf-YvdA-ehru-yb0S-8ytw-6uHH-DsfH8F
  PV Status             allocatable
  Total PE / Free PE    5758 / 638

  PV Name               /dev/dasdh1
  PV UUID               rVqwHH-P8jl-yfAt-jqeL-7Sx9-RziQ-E4eTb1
  PV Status             allocatable
  Total PE / Free PE    5758 / 638


# cat drbd.conf
global {
    disable-ip-verification;
}
common {
    protocol C;
}
resource dbms01 {
    device /dev/drbd01;
    disk   /dev/vgora_dbms/lvdbms01;
    meta-disk internal;
    on lnocsrq1 {
       address 172.27.100.211:7788;
    }
    on lnocsrq2 {
       address 172.27.100.212:7788;
    }
}
resource dbms02 {
    device /dev/drbd02;
    disk   /dev/vgora_dbms/lvdbms02;
    meta-disk internal;
    on lnocsrq1 {
       address 172.27.100.211:7788;
    }
    on lnocsrq2 {
       address 172.27.100.212:7788;
    }
}

When I run "drbdadm -c /etc/drbd.conf  create-md all "  I get the following error:

/etc/drbd.conf:23: conflicting use of IP '172.27.100.211:7788' ...
/etc/drbd.conf:12: IP '172.27.100.211:7788' first used here.

Any ideas on how to :

1.      convert an existing lvm2 filesystem to use drbd ?

2.      create several resources in /etc/drbd.conf

TIA
Bernie Wu




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