Click to See Complete Forum and Search --> : High availability using Heartbeat questions
Ok, this looks like a really interesting project. However, a I have a few questions that are unanswered.
1) How is data shared (or is it at all?) in a high-availability cluster? I'm now referring to something like harddrive mirroring.
2) How's Debian suited for the task?
Thanks in advance.
stiles
04-11-2002, 05:04 PM
Originally posted by Jani:
<STRONG>1) How is data shared (or is it at all?) in a high-availability cluster? I'm now referring to something like harddrive mirroring.</STRONG>
what service are you running? there are many ways of the cluster.
Originally posted by Jani:
<STRONG>2) How's Debian suited for the task?
</STRONG>
as well as any other distro, maybe a bit better.
I was planning on httpd, ftpd, ircd, mysqld, pop3/imap4/smtp, sshd and possibly even postgresql and named later on. Can I, for example, have a stack of RAID harddrives that whould mirror eachother that both computers could use? Something like shared disk usage.
stiles
04-12-2002, 05:22 PM
Originally posted by Jani:
<STRONG>I was planning on httpd, ftpd, ircd, mysqld, pop3/imap4/smtp, sshd and possibly even postgresql and named later on. </STRONG>
http ftp (download) is pretty easy using LVS (http://www.linuxvirtualserver.org/). You can use rsync over shh to replicate your web document root and your ftp files. I think smtp can be done like this too, but as a gateway.
databases are another story. I don't think neither mysql nor postgresql has the combination of replication, node locking and TP monitors. Now if a single image cluster was a reality maybe ( link1 (http://ssic-linux.sourceforge.net/) link2 (http://openmosix.sourceforge.net/) ). This lock manager (http://oss.software.ibm.com/dlm/) may be merged into the next kernel.
Originally posted by Jani:
<STRONG>Can I, for example, have a stack of RAID harddrives that whould mirror eachother that both computers could use? Something like shared disk usage. </STRONG>
with GFS (http://www.sistina.com/products_gfs.htm) yes. ?? opengfs (http://www.opengfs.org) ?? Or if you need read only you can share that mount over NFS. I think there is a clustered nfsd on www.freshmeat.net (http://www.freshmeat.net) but I have no idea if it works.