Re: Linux RAID Enterprise-Level Capabilities and If It Supports Raid Level Migration and Online Capacity Expansion

[Rik Herrin <rikherrin@yahoo.com>]

Thanks Lajber.  Sorry for taking so long to reply but
it's been a busy week.  Your test benchmarks look
interesting.  Do they take into consideration the
random seeks that Molle mentioned in his email?  As
Molle mentioned: "I've seen lots of MD tests, but none
that covered profiling MD's random access
performance".  Does this cover MD's random access
performance?  

Also, have you thought of using iometer
(http://www.iometer.org) and comparing it's results
with bonnie++'s results?  Just a thought...

Thanks for your time...

--- Lajber Zoltan <lajbi@lajli.gau.hu> wrote:

> Hi,
> 
> On Thu, 22 Dec 2005, Rik Herrin wrote:
> 
> > 	1) OCE: Online Capacity Expansion:  From the
> latest
> > version of mdadm (v2.2), it ssems that there is
> > support for it with the -G option.  How well
> tested is
> 
> Well, we use LVM above raid, thins is not a big
> issue.
> 
> > 	3) Performance issues:  I'm currently thinking of
> 
> I have some simple test with bonnie++, the sw raid
> superior to hw raid,
> except big-name storage systems.
> http://zeus.gau.hu/~lajbi/diskbenchmarks.txt
> 
> > 	4) Would anyone recommend a certain hotswap
> > enclosure?
> 
> We used ibm xseries and sun machines. The hotswap
> working well, but the
> number of drives very limited.
> 
> Take a look at http://www.coraid.com : very well
> scalable, cheap storage.
> 
> Bye,
>
-=Lajbi=----------------------------------------------------------------
>  LAJBER Zoltan               Szent Istvan Egyetem, 
> Informatika Hivatal
>  Most of the time, if you think you are in trouble,
> crank that throttle!
> 



		
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