Date: Fri, 30 Mar 2001 18:28:39 +1000 From: jonathan michaels <jon@caamora.com.au> To: so@server.i-clue.de Cc: Clemens Hermann <haribeau@gmx.de>, Colin Campbell <sgcccdc@citec.qld.gov.au>, freebsd-isp@FreeBSD.ORG Subject: Re: redundant servers Message-ID: <20010330182839.53476@caamora.com.au> In-Reply-To: <3AC4350F.3BD8D692@i-clue.de>; from Christoph Sold on Fri, Mar 30, 2001 at 09:26:07AM %2B0200 References: <Pine.BSF.4.33.0103301225540.35395-100000@guru.citec.qld.gov.au> <002c01c0b8e9$465f10e0$fe78a8c0@espe.de> <3AC4350F.3BD8D692@i-clue.de>
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On Fri, Mar 30, 2001 at 09:26:07AM +0200, Christoph Sold wrote: > To have some failsafe measure short of a HA solution, you can easily set > up two boxes. > > The first is the production server. Use MySQLs replication feature to > have the db replicated onto the slave. rsync, cpdup or even tar over NFS > gets all the other stuff updated in a cron job. > > Don't try to automate the switch to your fallback machine: this is what > makes HA expensive. Instead have some watchdog scripts check the > availablilty of the other machine. If anything fails, send an alarm to > your pager, SMS, or whatever you like. Do the failover switch by hand > (probably assisted by some prepared scripts). There are just too much > possibilities how a machine can fail to have all of this automated > without a budget. i was wondering how would something like the andrew filesystem (afs) go in this sort of situation, afs would effectively 'mirror' all teh hosts in a network (segment) from teh designated server(s). it is like a super nfs and rsync rolled into one with a whole lot more besides. there are several implementation bits in ports (coda and others, from memory). i've been thinking of doing something like that here, for redundancy and "quick" rebuild of a 'test-host'. i don't know what sort of a performance hit the network would take. i'm sure it would be somewhat large on the setup and inital file systems build and replicate, but after that ???? another $AUD0.02, regards jonathan -- ================================================================ Jonathan Michaels http://www.caamora.com.au PO Box 144, Rosebery, NSW 1445 suffering construction anxiety ============================================<jon@caamora.com.au> To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message
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