linux-kernel - Re: [ANNOUNCE] Ramback: faster than a speeding bullet

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Date:	Sun, 16 Mar 2008 18:42:01 -0800
From:	Daniel Phillips <phillips@...nq.net>
To:	David Newall <davidn@...idnewall.com>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, Willy Tarreau <w@....eu>,
	linux-kernel@...r.kernel.org
Subject: Re: [ANNOUNCE] Ramback: faster than a speeding bullet

On Sunday 16 March 2008 18:31, David Newall wrote:
> Daniel Phillips wrote:
> > The UPS provides a guarantee of commit to stable storage.  No amount of
> > FUD will change that.
> 
> What about system crashes?  They guarantee that data will be lost.  I

Not if it is mirrored and replicated.  Also nice if crashes are very
rare, which they are unless you work at it.

> know opinions are divided on the subject of crashes: You say Linux
> doesn't; everybody else says it does.  I side with experience.  (It does.)

I say it does not crash often, to the point where I have not seen it
crash once for any reason I did not create myself (I tend to wait for
the occasional brown bag release to fade away before shifting development  We do get quite a few
reports of less mature systems like hald and usb causing problems, and
not too long ago NFS client was very crash happy.  I did see some of
those myself two years ago, and fixed them.

On the whole, Linux is very reliable.  Very very reliable.  Now mirror
that, replicate it, add in 2 x 2 redundant power supplies backed by
independent UPS units so you can do regular preemptive maintenance on
the batteries, and you have a sweet enterprise transaction processing
system.  All set for a faster than light moon shot :-)

Daniel
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