[ILUG] data pushing on Linux, any suggestion?

[Brian O'Mahony]

Reading this thread, I thought I might as well ask this. Im planning on incorporating a SAN into our clearcase production environment (possibly over the Christmas break). Im going to be looking to drop from 3 VOB servers with standbys to one with a standby. 

Anyone have suggestions on the best method to use for clustering these two systems? I had seen DRBD before, but am unsure as to whether this will be good for what I require. Im reckoning as the Data will be held on the SAN all I need is a basic heartbeat cluster....

However as this will used for all the developers here and their various CC/CQ streams, I want something resilient.

B

-----Original Message-----
From: ilug-bounces at linux.ie [mailto:ilug-bounces at linux.ie] On Behalf Of stephen mulcahy
Sent: 24 November 2009 13:54
To: Kevin Brennan
Cc: ilug at linux.ie
Subject: Re: [ILUG] data pushing on Linux, any suggestion?

Kevin Brennan wrote:
>> Note that DRBD can only be accessed on one node at a time (the so 
>> called active node) so it may not be suitable if you want all of your 
>> fileservers serving requests simultaneously. 
> 
> Not quite true, it's regulary used in active/passive mode but DRBD can 
> also support active/active mode using a clustered file system like OCFS2 
> or GFS.
> 
> /KB
> 

Hehe,

As soon as I sent that, I knew I'd get corrected. From 
http://www.drbd.org/home/mirroring/

"In spite of this limitation, there are still a few ways to access the 
data on the second node:

     * Use DRBD on logical volumes and use LVM's capabilities to take 
snapshots on the standby node, and access the data via the snapshot.
     * DRBD's primary-primary mode with a shared disk file system (GFS, 
OCFS2). These systems are very sensitive to failures of the replication 
network. Currently we cannot generally recommend this for production use."

I'd be interested to hear of people successfully using DRBD in such a 
way in production without problems.

-stephen

-- 
Stephen Mulcahy     Atlantic Linux         http://www.atlanticlinux.ie
Registered in Ireland, no. 376591 (144 Ros Caoin, Roscam, Galway)
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