Re: Some GMirror questions.

I think you are making this harder than is needs to be. When in doubt defer
to the Handbook and the man pages. This also a good page
http://onlamp.com/pub/a/bsd/2005/11/10/FreeBSD_Basics.html

Lastly, I know at one point the 'load' algorithm had some performance
problems and people were saying to only use 'round-robin'. It seems as
though some code was committed back in Dec 2009 to fix it's this. Is there a
practical rule of thumb to using 'load' vs 'round-robin'?


Use load. http://www.freebsd.org/cgi/query-pr.cgi?pr=113885


Is this an accurate way to look at it?
"Round-robin because if you have two disks in a mirror, they’re both under
the same 'load' constraints, and it is best to KISS."


No. round-robin is a simple algorithm which alternates drive requests. Also
two identical HD's may be mirrored but they will not really ever be same
state in terms of caching, performance, etc.

--
Adam Vande More
_______________________________________________
freebsd-questions@xxxxxxxxxxx mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-questions
To unsubscribe, send any mail to "freebsd-questions-unsubscribe@xxxxxxxxxxx"

Relevant Pages

  • Some GMirror questions.
    ... There are a number of gmirror resources available online but there are a few discrepancies. ... Does creating the mirror need to be done from a Livefs CD or can it be done directly from the OS? ... I know at one point the 'load' algorithm had some performance problems and people were saying to only use 'round-robin'. ...
    (freebsd-questions)
  • Re: Hybrid Circuit
    ... :>Try a centre-tapped choke in your simulation instead of the mirror. ... :>to generate extra voltage and can't lock up or switch off. ... :>Hmm...you would need a load line with a positive slope. ... the 'load' isn't on the plate, or on the tube at all, yet it's still ...
    (rec.audio.tubes)
  • active collector loads (audio freq)
    ... an active load should not be heavily loaded, or much of the gain will ... one more thing about differential stages loaded with a current mirror: ... the collector currents to be largely equal. ...
    (sci.electronics.design)
  • Re: Petersons Algorithm in java, sequencial instruction execution ?
    ... I have to implement the Peterson's algorithm in java. ... For who of you which is not aware about it, is a low level concurrency ... Load C From B ...
    (comp.lang.java.programmer)
  • Re: active collector loads (audio freq)
    ... > an active load should not be heavily loaded, or much of the gain will ... > one more thing about differential stages loaded with a current mirror: ... the active load or gives some up to the controlling bjt. ...
    (sci.electronics.design)