On 2013-03-28T10:52:22, Fredrik Hudner <[email protected]> wrote:
> > So when you say, map the same 1 to 3 block devices my approach should be
> > correct ?
> 1/ add 1 block device on each of the 3 nodes, e.g /dev/sdd, /dev/sde
> and /dev/sdf
I'm not sure what you mean by this. Yes, on each of the three physical
nodes, you need to add the same block devices.
"same" meaning that they all need to be shared across the physical
nodes, which typically requires some SAN or iSCSI. If you have iSCSI, it
may be easier to run the iSCSI initiator directly in the VM.
> 2/ map each block device to the other VM's
Yes, you need to make these block devices available to all the VMs.
> When I run *# sbd -d /dev/sdd list *(same for all devices) it only
> comes back with all the options I can use.
That's not surprising. You need to call "create" first to initialize the
metadata. Otherwise, sbd thinks you're pointing it at a wrong device and
shows you the help ;-)
(Admittedly, that isn't always useful, so I've cleaned that up now.)
> I then run *# sbd -d /dev/sde allocate <nodename>* for each device and
> I can see e.g
> on testclu01 (node1)
> *# sbd -d /dev/sde list
> *
> * 0 testclu02 test testclu01*
> *but on /dev/sdd
> # sbd -d /dev/sdd list
> 0 testclu01 clear*
> *# sbd -d /dev/sdf list*
> (empty)
>
> on testclu03 (node3):
> *# sbd -d /dev/sde list*
> *0 testclu01 clear
> # sbd -d /dev/sdf list
> **0 testclu02 test testclu01*
> *# sbd -d /dev/sdd list
> *(empty)*
This doesn't make a lot of sense. If you've run "allocate" on all
devices for a given node, all the other nodes should see the same slot
per device.
But you're seeing one node on the first two devices, none on
the third; and it seems you've actually done more than you described,
namely sending a test message ;-)
Try doing it in one step:
sbd -d /dev/sde -d /dev/sdf -d /dev/sdd create
sbd -d /dev/sde -d /dev/sdf -d /dev/sdd allocate
It is also quite helpful if devices have the same name on all nodes; you
may find using /dev/disk/by-id/ convenient for this use case. It cuts
down on confusion.
Oh, and it is easier to read your mails and pastes if you don't use
HTML mail but standard mail formatting, indentation, and quoting.
Thanks!
Mit freundlichen Grüßen,
Lars
--
Architect Storage/HA
SUSE LINUX Products GmbH, GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer, HRB
21284 (AG Nürnberg)
"Experience is the name everyone gives to their mistakes." -- Oscar Wilde
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