Re: [OSR-devel] OSR on DRBD+GFS

[Marc G. <gr...@at...>]

Hi Gordan,
On Saturday 09 February 2008 01:56:18 Gordan Bobic wrote:
> Hi,
>
> I'm trying to add support for DRBDs, and trying to stick with doing it
> in a way consistent with iSCSI support as far as it is possible. I'm
> seeing a few weird things, though.
>
> In linuxrc.generic.sh:
> [...]
> # start iscsi if apropriate
> isISCSIRootsource $rootsource
> if [ $? -eq 0 ]; then
>          loadISCSI
>          startISCSI $rootsource $nodename
> fi
>
> # start drbd if appropriate
> isDRBDRootSource $rootsource
> if [ $? -eq 0 ]; then
>          loadDRBD
>          startDRBD $rootsource $nodename
> fi
> [...]
>
> and in cluster.conf:
> [...]
> <clusternodes>
>                  <clusternode name="sentinel1c" nodeid="1" votes="2">
>                          <com_info>
>                                  <rootsource name="drbd"/>
>
> [...]
Agreed. That's the place.You also have a bootoption rootsource to overwrite 
it. Normally we would suspect rootsource to be some kind of url like for 
example iscsi://iscsi-host/export-name or it might be drbd://slave/export or 
something. I cannot remember the semantics there too long ago ;-) .

Are you also aware of the com-expert bootoption? This one is quite handy as it 
brings you to a shell before the process of the initrd is started. And you 
can change some things to see if they work or not.

Answer to the iscsi questioning stuff.
[marc@mobilix-07 boot-scripts]$ source etc/iscsi-lib.sh
[marc@mobilix-07 boot-scripts]$ isISCSIRootsource drbd
[marc@mobilix-07 boot-scripts]$ echo $?
1
[marc@mobilix-07 boot-scripts]$ isISCSIRootsource iscsi
[marc@mobilix-07 boot-scripts]$ echo $?
0
[marc@mobilix-07 boot-scripts]$

So if we are going iscsi we'll return a '0'. As a successfully executed 
shellscript does.
>
>  From this, one would assume that isISCSIRootsource would return false
> and iSCSI not get initialized, and isDRBDRootSource would return true
> and get initialized.
>
> This is the opposite of what I'm seeing. iSCSI gets started, and the
> modules loaded. DRBD doesn't.
>
> Am I misunderstanding where $nodename is coming from? I'm not
> particularly bothered by iSCSI trying to start (and failing because the
> iscsi packages aren't in the rpm list), but that makes the drbd not
> starting all the more puzzling. :-/
$nodename is the nodename that belongs to the node in bootprocess. But it is 
not necessarily the hostname. The function 
cluster-lib.sh/getClusterFSParameters returns it. It's a little bit calling 
other functions to make it more independent from the cluster.conf (that was 
the idea in the first place).
>
> Further on (unrelated to this), I get cman starting, but ccsd failing,
> so the boot-up aborts. But ps -aux | grep ccsd shows that ccsd is in
> fact already running. I haven't seen this behaviour before. The only
> thing I can think of that is different is that this is a 2-node cluster,
> which is much smaller than what I usually work with. (Yes I did set
> <cman two_node="1" expected_votes="2"/>)
Enable syslogging to a syslog server. <syslog name="server"/> does the trick 
and see what it tells you.


>
> Any ideas?
Not yet ;-)

Marc.
>
> Gordan
>
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Gruss / Regards,

Marc Grimme
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