Date: Mon, 05 Apr 2010 16:43:06 -0400 From: jfarmer@goldsword.com To: freebsd-stable@freebsd.org Subject: Re: fault tolerant web servers on freebsd Message-ID: <20100405164306.hmy4n8pvs4goc8ks@www.goldsword.com> In-Reply-To: <4BBA4478.7030302@gausus.net> References: <1209800810.33861270466947931.JavaMail.root@dagobah.intersec.pl> <4BBA05A2.40706@intertainservices.com> <4BBA1823.1090305@gausus.net> <4BBA4334.1020506@interazioni.it> <4BBA4478.7030302@gausus.net>
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Quoting Maciej Jan Broniarz <gausus@gausus.net>:
> W dniu 10-04-05 22:08, Tonix (Antonio Nati) pisze:
>> Maciej Jan Broniarz ha scritto:
>>> W dniu 10-04-05 17:45, Mike Jakubik pisze:
>>
>> Just to use exact words, fault toulerancy is not possible with any
>> FreeBSD/Linux O.S.
>> F.T. means outage can occur in every moment, but all current operation
>> will be always completed by other equipments; so there will not be
>> interrupted/lost operations.
>
> Hmm. Thanks for the tip. Which *NIX os can be used to build an FT
> solution then? Solaris? AIX? HP-UX?
You're asking a question that has not easy or compete answer. Fault =20
tolerant at what level? Do you want to guarantee that _every_ DB =20
operation competes? What about random file reads or writes? Do you =20
want to guarantee that two identical operations with the same data =20
will produce the same result? (That's _not_ the same as the previous =20
questions...)
So first you have to define your workload, then define what errors you =20
must avoid or allow, and then define how to deal with failures, =20
errors, etc.
Then you can start talking about High Availability vs. level of Fault =20
tolerance, vs. ....
John
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J. T. Farmer <jfarmer@goldsword.com> <jfarmer@orfencer.org>
GoldSword Systems, Knoxville TN Coach & Instructor
Consulting, Knoxville Academy of the Blade
Software Development, Maryville Fencing Club
Project Management
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