Hi... I use drbd and heartbeat for some clusters at work. We run apache, mysql, qmail, pound (a free load balancer), an Oracle Instance (where we cannot use our RAC) and also for the admin server of a weblogic server. I'm using drbd 0.7.xx and heartbeat 1.2.x on RHEL3 and RHEL4, 32 and 64 bit. Some of those cluster are running from more then one year without any problems.
Heartbeat it simple to install and need no mainteinance at all, you can upgrade it without problems (the 2.0 also support multinode cluster). DRBD can also be configured to get some performance boost at risk for data writing on disk (he have 3 mode of disk writing). If you have a free network card you can dedicate it to heartbeat and drbd with a crossover cable and at least with Linux the networking work quite well so you can get good performance on a 1gb network card. The only "problem" with drbd is that if you need to upgrade the kernel you'all also need to recompile the drbd drivers for that kernel or you'll not see the disks. Heartbeat and drbd will integrate themself simply without problems. You'll end with a shared disk (that can be only primary in write access from one node) where you'll install the entire hobbit home directory, a shared ip address that you will use as ip address for hobbit. You will just need one line of configuration in the heartbeat resource file to put the ip, the device to mount and the script to start hobbit.
Regarding performance I think it will not be so bad but I think it will depends from how many rrd youre using for graphs. I think that with a gb network card and a good buffer for io the performance will not be a problem.
Francesco
-----Original Message----- From: Thomas [mailto:tlp-hobbit at holme-pedersen.dk] Sent: Thursday, August 17, 2006 9:40 PM To: hobbit at hswn.dk Subject: [hobbit] Hobbit cluster and DRDB
Hi Brothers,
Just read an article in Linux Journal about using DRDB as a "cluster" filesystem for a redundant installation of sendmail and mysql. This has caused me to think that this could be a way forward as a cluster mecanism for hobbit. Currently I run a rdist job for this and then have a manual intervention for starting up hobbit on the secondary node.
I know from when I last looked at DRDB that the IO performance as a problem with BB but with Hobbit I am prety sure it should work.
I am wondering if any of you have experienced with the DRDB/heartbeat/hobbit and what your impressions are ?
Regards, Thomas
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