RE: Parity Set Configuration Advice

[CWilt@xxxxxxxxxxxx]

Chad,

Actually I asked this same question a couple of years ago in the
comp.sys.ibm.as400.misc newsgroup.  You may find the thread useful.

http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&oe=UTF-8&threadm=jd_G8.83
784%24UV4.143234%40rwcrnsc54&rnum=5&prev=/groups%3Fsourceid%3Dnavclient%26ie
%3DUTF-8%26oe%3DUTF-8%26q%3DRAID%2Bgroup%253A%2Bcomp.sys.ibm.as400.misc

Basically, multiple RAID sets provides
- statistically lower chance of data loss with multiple failures.
- better performance during a failure

with a possible cost via decreased performance.

I'd be interested in seeing if anyone here has more detailed information.

Charles



> -----Original Message-----
> From: ChadB@xxxxxxxxxxxxxxxxxxxx [mailto:ChadB@xxxxxxxxxxxxxxxxxxxx]
> Sent: Tuesday, April 20, 2004 11:27 AM
> To: midrange-l@xxxxxxxxxxxx
> Subject: Parity Set Configuration Advice
> 
> 
> Hello all... been reading forever and am posting the first time...
> 
> We will have 6 of the 36gb 15k RPM drives setup on a 2757 
> controller.  I'm
> trying to decide what would be the 'best' way to configure 
> them in terms of
> parity sets.  Can anyone help me with the decision?  I'm 
> picturing either 6
> drives in a single parity set, or 2 parity sets of 3 drives each.  I'm
> interested in getting some thoughts on which setup makes more sense in
> terms of protection and performance.  I know that by setting 
> them up as 2
> parity sets of 3 drives we will lose more capacity, but I 
> want to get some
> feeling for how much additional performance or protection 
> that setup might
> offer compared to the 6 drives in one set.   Can anyone offer 
> any further
> advice?
> 
> The system is a 950cpw Model 800 that runs a single Domino 
> workload (200
> users max) and a Websphere workload.
> 
> Thanks for the help...
> 
> 
> Chad Burrall
> 
> 
> AS/400 Administrator
> 
> 
> Wheeling-Nisshin, Inc.
> 
> 
> 
> 
> 
> 
> 
> 
> 
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> 
> 
> 
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