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Date:      Wed, 12 Jun 2002 21:08:16 -0500
From:      Dan Nelson <dnelson@allantgroup.com>
To:        BSD Freak <bsd-freak@mbox.com.au>
Cc:        FreeBSD Questions <freebsd-questions@FreeBSD.ORG>
Subject:   Re: Network RAID on FreeBSD
Message-ID:  <20020613020816.GA63459@dan.emsphone.com>
In-Reply-To: <123a0fb123a261.123a261123a0fb@mbox.com.au>
References:  <123a0fb123a261.123a261123a0fb@mbox.com.au>

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In the last episode (Jun 13), BSD Freak said:
> Hi all,
> 
> We have a server which is highly critical. Data loss or downtime on it 
> is not an option so we have a hardware RAID 1 and also a second "hot 
> host" (in another building) which replicates data from the main one 
> every 30 minutes (via rsync). However it is this 30 minute window that 
> concerns me because that leaves us open to 30 minutes of data loss. 
> 
> So basically what I'm asking is (without switching to Sun equipent) is 
> it possible to do some sort of network RAID where data is written to 
> both systems simultaneously? We need our system to carry on with no 
> data loss even if one of the servers should suffer a complete system 
> failure (ie be blown up or thrown out of the window)......

Only by doing it in software; i.e. using Mysql's replication feature to
simultaneously update a remote database, or modifying your applications
to update the remote system as part of their regular operation.

-- 
	Dan Nelson
	dnelson@allantgroup.com

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