[nmglug] Raid Help

[Tim Emerick]

After talking with some folks I've come to the conclusion that I'm using the
wrong level of raid.  I thought that by having an off-the-shelf ATA/133 RAID
controller (SiL) I was using hardware RAID.  Turns out that it's software
raid.  I had set it up to do mirroring (RAID1).  Nice reads......horrible
writes, especially for some of the database apps.

After checking out this site ( http://www.acnc.com/04_00.html ) it would seem
that I need to be using RAID10 for the database application.

I apologize for not specifying the correct information initially.  What I was
hoping for was that someone would prompt me with questions that I didn't know
needed to be asked.

Thanks for the help!!!!

--- Ed Brown <ebrown at lanl.gov> wrote:
> You asked initially about possible misconfigurations that could be
> causing extremely poor performance, performance not characteristic of
> hardware OR software raid, at any level of raid.  Which kind you are
> doing, and how it is configured, are sort of relevent.   
> 
> 
> On Thu, 2005-05-26 at 12:29, Tim Emerick wrote:
> > I'm actually not concerned much with software vs hardware raid but more
> > interested in getting better performance with some fault tolerance.
> > 
> > In doing some more research it seems that what I need to do is make a
> jump to
> > RAID10...stripe+mirror.  http://www.acnc.com/04_00.html
> > 
> > Sounds like what I need is another ide controller and 2 more drives to do
> the
> > RAID10.
> > 
> > Any thoughts on whether I would get a performance boost or not?
> > 
> > Here's my /proc/mdstat for your reading enjoyment.
> > 
> > 
> > v8701-a1:~# cat /proc/mdstat
> > Personalities : [raid1]
> > md0 : active raid1 hde1[0] hdg1[1]
> >       78150592 blocks [2/2] [UU]
> > 
> > unused devices: <none>
> > 
> > Tim Emerick
> > 
> > --- Sam Noble <sam.noble at comcast.net> wrote:
> > 
> > > On Thu, 2005-05-26 at 08:01 -0700, Tim Emerick wrote:
> > > > Dunno.  ;-)
> > > 
> > > As mentioned, this looks like software raid. But if you
> > > post /proc/mdstat we'll know for sure :)
> > > -- 
> > > GPG key F343E5FC (fingerprint:DF37 93BC AFEC 0A6A CC08  4A95 3790 8B4C
> > > F343 E5FC)
> > > available at: http://sam.noble.home.comcast.net/sams_publickey.gpg.asc
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> > 
> > 
> > 
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