Virtual Machine Replication & Failover with VMWare Server & Debian Etch - 2 questions

Discussion in 'HOWTO-Related Questions' started by Zingaro2002, May 8, 2008.

  1. Zingaro2002

    Zingaro2002 New Member

    Hi,
    I'm following
    Virtual Machine Replication & Failover with VMWare Server & Debian Etch (4.0) howto.
    I have not yet completed it, but I have to say that it's wonderful!
    Thanks to Francis Theys, Falko Timme, Till Brehm!!!

    Now my question...
    I am arrived at the point in which I write
    mount -t ext3 /dev/drbd0 /var/vm
    on both servers.

    On server1 the command executes correctly.

    On server2 it says:
    mount: block device /dev/drbd0 is write-protected, mounting read-only
    mount: /dev/drbd0 already mounted or /var/vm busy

    And of course if I put a "df -h" command I have:
    On server1:
    Filesystem Dimens. Used Avail. Usage% Mounted on
    /dev/hda2 7,0G 1,2G 5,5G 18% /
    tmpfs 475M 0 475M 0% /lib/init/rw
    udev 10M 56K 10M 1% /dev
    tmpfs 475M 0 475M 0% /dev/shm
    /dev/hda1 464M 17M 423M 4% /boot
    /dev/drbd0 450G 199M 427G 1% /var/vm

    and on server2
    Filesystem Dimens. Used Avail. Usage% Mounted on
    /dev/hda2 7,0G 1,2G 5,6G 17% /
    tmpfs 475M 0 475M 0% /lib/init/rw
    udev 10M 56K 10M 1% /dev
    tmpfs 475M 0 475M 0% /dev/shm
    /dev/hda1 464M 15M 425M 4% /boot

    Is it right?

    ***************

    Another question.
    If I write "cat /proc/drbd" I have:

    On server 1:
    version: 0.7.21 (api:79/proto:74)
    SVN Revision: 2326 build by [email protected], 2008-05-08 11:30:30
    0: cs:Connected st:primary/Secondary ld:Consistent
    ns:24 nr:0 dw:7641924 dr:273 al:7259 bm:0 lo:0 pe:0 ua:0 ap:0
    1: cs:Unconfigured

    On server 2:
    version: 0.7.21 (api:79/proto:74)
    SVN Revision: 2326 build by [email protected], 2008-05-08 11:30:31
    0: cs:Connected st:Secondary/Primary ld:Consistent
    ns:0 nr:24 dw:7641924 dr:0 al:0 bm:0 lo:0 pe:0 ua:0 ap:0
    1: cs:Unconfigured

    Is it right?

    If I create a simple text file on /var/vm in server1 I would expect to find it also on server 2 but... nothing!
    Am I missing something?

    I'd like to have clearer ideas before going further with this very useful howto.

    Thanks to the authors (I hope some of them can help me!!!)


    Can anyone help me?
     
    Last edited: May 8, 2008
  2. thanis

    thanis New Member

    Hi, this is "normal" as you can't mount the DRBD volume on both servers at once. You should mount it on one server, and then use it for the VM creation. DRBD will replicate is.

    If you "unmount" the DRBD volume and then put the primary server "offline", you will be able to mount the DRBD volume on your second server.

    Kind regards,
    Thanis

    PS: I should be more active here, it has been ages since my last visit :p
     
  3. Zingaro2002

    Zingaro2002 New Member

    Thank you very much...

    and what about my second question? (see above)
     
  4. thanis

    thanis New Member

    As for question 2: YEs, that is a correct output :) It says your DRBD volume is replicated and consistent .
     

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