On Nov 26, 2007, at 9:56 AM, <[EMAIL PROTECTED]> <[EMAIL PROTECTED]
> wrote:
Thanks Andrew,
My comments are inline...
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Andrew
Beekhof
Sent: Monday, November 26, 2007 1:44 PM
To: General Linux-HA mailing list
Subject: Re: [Linux-HA] Fencing prevents resource from failing over
On Nov 26, 2007, at 6:25 AM, <[EMAIL PROTECTED]>
<[EMAIL PROTECTED] > wrote:
Hi,
I've a 2 node active/passive cluster ( active node=>active , passive
node=>standby) using heartbeat 2.0.8 . I recently enabled stonith .
The
stonith device is an rsh device that tries to restart the cluster
node.
However, something that used to work with stonith disabled has
stopped
working now ; Node failover on network cable disconnection. I believe
since the stonith device uses the network, the stonith fails and
hence
the resource is left wherever it was running.
correct. the cluster will not start anything until it can verify the
node is truly dead (with a successful stonith operation) this is how a
stonith enabled cluster is supposed to work and is why IP-based
stonith
modules are not a great idea.
Can anyone please help resolve this problem (this is probably not a
problem and this is how stonith is expected to work )? I would like
to
know if there's anyway to tell the passive (currently active node) to
give up trying to stonith and then start the resource.
by design - no.
I've attached my
cib file and logs from the passive when cable is disconnected.
I've no problem both nodes running the resource as active is anyway
cut-off from network and can't do any damage.
if thats truly the case, then you may not need stonith.
ABHI: But, if the Active comes online again it's a very bad thing for
both nodes to be running the resources.
the crm will detect that and stop one of them.
however there will always be a period of time (even with your proposal
below) where they are both active and both connected to the network
Can we configure two stonith
devices and make the node think stonith is successful if either of the
stonith operations return success.Is their some kind of resource
constraint that I can use in this case ?
1. Online stonith device: That uses IP to reset the other node.
2. Offline stonith device: That is just dummy and on reset always
returns success.
if you're lucky, this might work 9 times out of 10.
but its likely that when it doesn't work, that its going to _really_
hurt you.
"tricking" the cluster almost always leads to pain.
my advice... get a real stonith device...
The standby log seems to
say it has quorum
2-node clusters always have quorum, so the value is meaningless...
but it makes me wonder why it doesnt start the resources , inspite of
the following evident from the logs.
1. Standby marks active unclean
2. Standby has quorum
3. Standby tries to move resources back to standby
Thanks in advance,
Abhi.
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