HAST - documentation unclear to me
Erik Scholtz
escholtz at argonsoft.de
Wed Jan 11 09:14:18 UTC 2012
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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