[nmglug] Raid Help

[Jason Davis]

On Thu, 2005-05-26 at 17:46 -0700, Tim Emerick wrote:
> 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.
> 




Tim I doubt going to raid10 will make that big of a differience.
You're write speeds sound way below par... for any kind of raid
(software or hardware)

Good Luck,
jd








> 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 :)
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