[Linux-HA] After testing a desaster, DRBD devices cant connectto each other

Anquijix Schiptara anquijix at hotmail.com
Wed Jul 6 01:08:20 MDT 2005


After reading all descriptions about stonith, i still dont understand, what 
a stonith device is. Is that hardware- or software based (like watchdog)?

>From: Alan Robertson <alanr at unix.sh>
>Reply-To: General Linux-HA mailing list <linux-ha at lists.linux-ha.org>
>To: General Linux-HA mailing list <linux-ha at lists.linux-ha.org>
>Subject: Re: [Linux-HA] After testing a desaster,	DRBD devices cant 
>connectto each other
>Date: Tue, 05 Jul 2005 08:24:49 -0600
>
>Anquijix Schiptara wrote:
>>Hi there
>>
>>Few days ago i tested a failure case. A short blackout of the master (with 
>>breaking heartbeat connections for deadtime seconds). After deadtime 
>>seconds, i plugged the connections in and looked, what happens.
>>At first, both server are active, they recognize that and handle it 
>>"ping-pong" like (2 changes of master), until the initial position was 
>>reached again (master=master, slave=slave).
>>But now i have the problem, that the DRBD-Devices arent connected anymore.
>>On master i have the state Primary/Unknown, and on slave 
>>Secondary/Unknown.
>>
>>In man drbdsetup/drbdadm i couldnt find any suitable options to reconnect 
>>to the mirror. So I have to stop heartbeat, that i can restart DRBD. The 
>>consequence is, that i have a short breakdown of the hole cluster, until i 
>>restarted the services. And i think, that shouldnt be so in a HA 
>>environment.
>
>If you're going to break all communication between the two sides and you 
>want automatic recovery, then you'll need to configure a STONITH device.
>
>
>--
>     Alan Robertson <alanr at unix.sh>
>
>"Openness is the foundation and preservative of friendship...  Let me claim 
>from you at all times your undisguised opinions." - William Wilberforce
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