[DRBD-user] drbd 8.3.12 not writing meta data

Lars Ellenberg lars.ellenberg at linbit.com
Tue Oct 16 14:10:06 CEST 2012

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

And yet an other mal that went into my Drafts folder instead of being
sent out :-(

On Mon, Jun 11, 2012 at 08:36:03PM +0200, Dirk wrote:
> Hi Lars,
> Am 08.06.12 15:35, schrieb Lars Ellenberg:
> >On Wed, Jun 06, 2012 at 09:28:33PM +0200, Dirk wrote:
> >>Hi folks,
> >>
> >>on a freshly installed server pair I am activating 3 drbd volumes each.
> >>The first two go without problem, the third returns
> >>>[root at server-01 ~]# drbdadm create-md RESOURCE
> >>>Writing meta data...
> >>>initializing activity log
> >>>NOT initialized bitmap
> >>>New drbd meta data block successfully created.
> >>>success
> >>>Command 'drbdmeta 2 v08 /dev/sda7 internal write-dev-uuid
> >>>B8B8EDD2900264FC' terminated with exit code 255
> >>The weird things about that are:
> >>- /dev/sda7 is a freshly created partition with nothing on it
> >>- this happens on both servers with exactly this partition
> >>
> >>Even disabling sanity-checks does not really work:
> >No, nothing to do with those.
> >
> >>I am stuck. I do not google many hits with the above exit code and
> >>find nothing in the docs about it - any hint or help is appreciated.
> >maybe you can strace it,
> >and/or run with an insane amount of "-v", like
> >
> >strace -o tmp.create.out \
> >   drbdmeta 2 v08 /dev/sda7 internal create-md -vvvvvvvvvvv
> >strace -o tmp.write-dev-uuid.out \
> >   drbdmeta 2 v08 /dev/sda7 internal write-dev-uuid B8B8EDD2900264FC -vvvvvvvvvvv
> Both outputs are here: http://pastebin.com/6maszyJG

create-md wrote:
4096, 4292866048) = 4096

note the "\4" in there, this is the "just created" UUID.
If you had not truncated the strace output, or included stdout with
sufficient -v, you'd see other non-NUL bytes there, too.

And write-dev-uuid tries to find the meta data,
but does only find zeros.
4096, 4292866048) = 4096

So: whatever is written to your sda7 seems to revert back to zeros

You are very sure there is nothing "special" with your "sda7",
like it is actually a ram disk, or a dm-zero target?

: Lars Ellenberg
: LINBIT | Your Way to High Availability
: DRBD/HA support and consulting http://www.linbit.com

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