Date: Wed, 11 Jan 2012 09:47:30 +0100 From: Erik Scholtz <escholtz@argonsoft.de> To: cluster@freebsd.org Subject: HAST - documentation unclear to me Message-ID: <4F0D4CA2.9060104@argonsoft.de>
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Hi, again I'm in the need of building a FreeBSD cluster (for loadbalancing purposes, not for failover purposes). Still GFS, GPFS or OCFS2 isn't ported to FreeBSD yet, so I was reading about HAST. The one point I do not get is the following part: "[..] HAST works in Primary-Secondary (Master-Backup, Master-Slave) configuration, which means that only one of the cluster nodes can be active at any given time. Active node will be called Primary node. This is the node that will be able to handle I/O requests to HAST-managed devices. [...]" IMHO this can mean two things: 1) Only the Master can be operational, the slave is in standby (and therefor can not be used as loadbalancing system) 2) Slave can be operational too, but on a write-access to the slave it will be sent to the master, that syncs it back to the slave again (which will cost performance but will work). Does anyone of you have an idea which option (1 or 2) is the way HAST will work? If option 1 is the behaviour of HAST: Any recommendations howto loadbalance an apache webserver (with read/write operations)? Mounting the data from a NFS-Volume costs a lot of time (nearly 1 second slower per request) and therefor is not recommended in an apache highperformance-setup. Thanks for your answers. Greetings, Erik -- My blog: http://blog.elitecoderz.net
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