Re: NT and Linux

[King Lee <king@ultrix6.cs.csubak.edu>]

On Thu, 28 May 1998, Leandro Guimaraens Faria Corcete Dutra wrote:

> King Lee wrote:
> >    1.   Has anyone here had any experience or knowledge
> >         about software raid. How good is it?
> >    2.   Does Linux  support hardware raid 5
> 
> 	Just (re)found it!
> http://www.osnews.com./features/04.98/raid.html
> 
> 	Very good reading indeed!  Enjoy and tell us what has come of it!

Thanks for info. Also
     http://www.linas.org/linux/raid.html
had some very good info.

I was surprised to learn that the 2.2 kernel supports software raid
and that the software raid was as fast as hardware raid 5. 
Raid 5 does error correction and even if one of the disks
die data can be recovered and the system continue. 
The article from www.osnews.com did say that software raid takes
up CPU cycles, but it did not say how much. It would seem that if
the CPU must check for errors on each byte from disk and performance
would take a big hit.  Perhaps the kernel  checks for errors only
if it knows that a disk died, and normally there would not
be a hit.  Does anyone know about CPU hit of software raid.
Why would anyone buy expensive raid hardware if software
does the same without too much penalty?

King Lee



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