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Re: Linux Takes Over Mission-critical Systems

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On Wed, 29 Mar 2006 10:10:00 +0100,
 Roy Schestowitz <newsgroups@xxxxxxxxxxxxxxx> wrote:
> __/ [ BearItAll ] on Wednesday 29 March 2006 09:37 \__
>> Roy Schestowitz wrote:
>>> Linuxworld: Linux continues Unix bloodbath
>>> ,----[ Quote ]
>>> | Even the most mission-critical, Unix-based central business systems are
>>> | being replaced by Linux running on commodity hardware, according to
>>> | delegates at Linuxworld 2006 conference and expo in Sydney yesterday.
>>> `----
>>> http://www.linuxworld.com.au/index.php/id;1528118963;fp;2;fpid;1
>> That is basically what I recommend to companies. Always mirror/cluster, but
>> don't worry about using cheaper machines to save costs. I always have to
>> remind them that a mirror isn't a backup (you wouldn't believe the number
>> of companies I visit where they assume a mirror means a backup isn't
>> necessary).
>> All my servers here are just cheap off the shelf machines, except one, a
>> Dell Poweredge which only has the job of a mirror and backup control,
>> because I can't trust it to be a live server. Typical isn't it, the most
>> expensive machine I have and it will never actually do the job of a server.
> Mirror != Backup? What's deficient in the following, for example?

it's not a mirror. In clustering context, a mirror, reflects any changes
"instantly" so a rogue rm -rf . / or equivilent booboo, would nuke the mirror.

Another example, I have three MySQL servers hapilly replicating a
database, if one of the servers goes down, no problem, I still have the
other two available, but if the db admin accidentally drops the wrong
table, the slaves will happily repllicate that action.

> ,----[ Code ]
>| # Locally 
>| nice scp -r ~/.[0-z]* ~/* roy@home:/home/roy/Main/BU/Baine-`date +%Y-%m-%d`
>| # On remote side
>| mkdir /media/SEA_DISK/Home/`date +%Y-%m-%d`
>| tar -cf - /home/roy/Main/BU|split -b 1000m - /media/SEA_DISK/Home/`date
>| +%Y-%m-%d`/Baine-`date +%Y-%m-%d`.tar.
> `----
> I am not confuting your opinion. Rather, I am asking for your kind advice...
> I have mirrors on 3 hard-drives and the O/S is restorable from the CD/s.
> Roy

they aren't mirrors, they are snapshots. 

Version: GnuPG v1.4.2.2 (GNU/Linux)


Jim Richardson     http://www.eskimo.com/~warlock
"It doesn't matter who you vote for, the government always gets in" 

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