[DRBD-user] Still can't get the magic combination to get a stacked device to work ... help!

[Sam Howard]

Hi.
I'm still struggling to get a stacked device to work on DRBD 8.3.0.

Config excerpt:

common {
  syncer {
        rate 70M;
        verify-alg md5;
  }

  protocol C;

  startup {
    wfc-timeout         0;  ## Infinite!
    degr-wfc-timeout  120;  ## 2 minutes.
  }

  disk {
    on-io-error detach;
  }

  net {
    allow-two-primaries;
  }
}

resource ftp01-root {
  device        /dev/drbd2;
  disk          /dev/datavg/ftp01-root;
  flexible-meta-disk internal;

  on xen-33-18-02 {
    address    192.168.250.12:7702;
  }

  on xen-33-18-03 {
    address    192.168.250.13:7702;
  }
}  # ftp01-root

resource ftp01-root-b {
  device        /dev/drbd2;
  disk          /dev/datavg/ftp01-root;
  meta-disk     /dev/datavg/drbd_log[2];

  on xen-80-31-00 {
    address    192.168.250.14:7702;
  }

  on xen-80-31-01 {
    address    192.168.250.15:7702;
  }
}  # ftp01-root-b

resource ftp01-root-r {
  protocol      A;

  stacked-on-top-of ftp01-root {
    device      /dev/drbd102;
    address     10.80.31.51:7702;
  }

  stacked-on-top-of ftp01-root-b {
    device      /dev/drbd102;
    address     10.80.31.50:7702;
  }
}  # ftp01-root-r

=========================================

I have the ftp01-root device up and running (currently in use and working
fine).  I build my new server (xen-80-31-00) and got its device
"ftp01-root-b" running.

xen-33-18-03 (ftp01-root):
 2: cs:WFConnection ro:Primary/Unknown ds:UpToDate/DUnknown C r---
    ns:2176532 nr:999236 dw:3190465 dr:2068626 al:79 bm:78 lo:0 pe:0 ua:0
ap:0 e
p:1 wo:b oos:1420

xen-80-31-00 (ftp01-root-b):
 2: cs:WFConnection ro:Primary/Unknown ds:UpToDate/DUnknown C r---
    ns:0 nr:0 dw:0 dr:0 al:0 bm:0 lo:0 pe:0 ua:0 ap:0 ep:1 wo:b oos:4194304

On both hosts, the other node is down, hence the "DUnknown" for the second
host.

Trying to create the stacked device fails with:

root at xen-33-18-03:/etc# drbdadm --stacked up ftp01-root-r
/dev/drbd102: Failure: (127) Device minor not allocated
Command 'drbdsetup /dev/drbd102 disk /dev/drbd2 /dev/drbd2 internal
--set-defaults --create-device --on-io-error=detach' terminated with exit
code 10

I do see the device (/dev/drbd102) *is* getting created:

brw-rw---- 1 root disk 147, 102 2009-02-02 01:37 /dev/drbd102

Google has not been much help, and I'm really stuck now.

Just to make it more fun, it seems the batch of Samsung 750GB drives that
are in the xen-33-18-xx servers aren't very good and I'm loosing drives left
and right, so I need to get this data moved ASAP.

What can I try next?

Thanks,
Sam
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