It robs of CPU power, that's true, but I've never seen a place where CPU
consumption would go
above 30% on average. If it does, then it's time to upgrade, or to quote the
Taco Bell dog,
you need a bigger box. With approximately 70% left idle, companies usually
have a few percent
of the CPU power to dedicate for RAID-0. After all, all those boxes have nfs
daemons, sendmail,
lpd/lp/CUPS, xdm/gdm, automounter and some other daemons running. Database
server seldomly needs
to export file systems, route mail (well, that comes in handy here and
there), manipulate printers
or scan the units for a music CD. If I want to play Kashmir or Stairway To
Heaven, I'm not
going to (ab)use my database server for that purpose. Those few percent
spent on RAID-0 are quite
insignificant in comparison with the CPU percentage wasted by routed, gated,
walld, talkd, xdm
and alike. The sad truth is that people no longer tune their systems,
because a bigger system is
actually cheaper then an SA needed to tune it properly. We're talking about
the SUV mentality
translated into IT. You don't actually care whether an additional gallon of
washing liquid is
wasting space in your SUV when you have enough room to accommodate a medium
sized elementary
school in your vehicle.
--
Mladen Gogala
Oracle DBA
-----Original Message-----
Millsap
Sent: Wednesday, August 13, 2003 11:39 PM
To: Multiple recipients of list ORACLE-L
Problem with head-to-head price comparisons is that software RAID level 0
has hidden costs that a lot of folk might not understand before purchasing.
For example, I would argue that software RAID level 0 costs a heck of a lot
more than the list price, because it robs CPU capacity from your
applications.
Cary Millsap
Hotsos Enterprises, Ltd.
http://www.hotsos.com
Upcoming events:
- Hotsos Clinic 101 in Denver, Sydney
- Hotsos Symposium 2004, March 7-10 Dallas
- Visit www.hotsos.com for schedule details...
-----Original Message-----
Jesse, Rich
Sent: Wednesday, August 13, 2003 11:49 AM
To: Multiple recipients of list ORACLE-L
How's about price? That's pretty important to some folk. :)
Rich
Rich Jesse System/Database Administrator
rjesse_at_qtiworld.com Quad/Tech Inc, Sussex, WI USA
> -----Original Message-----
> From: Matthew Zito [mailto:mzito_at_gridapp.com]
> Sent: Wednesday, August 13, 2003 11:14 AM
> To: Multiple recipients of list ORACLE-L
> Subject: RE: Raid 1 vs Raid 5 for tablespaces
>
>
>
>
> The _only_ even theoretical advantage to software RAID-0 is
> that software
> RAID implementations tend to have more flexibility than the
> hardware ones.
> For example, there are a number of software RAID
> implementations that allow
> you to grow RAID-0 volumes, something that is generally not allowed in
> hardware RAID, and most of those allow you to do it online.
> Some of the
> better software RAID implementations even allow for online volume type
> conversion - from RAID-1 to RAID-5 when adding a third disk
> to a mirrored
> pair, as a random example.
>
> Beyond that, there's no reason to have software RAID. Any
> other extraneous
> advantages can be gleaned by using a traditional VM on top of hardware
> RAID-ed devices. And even some of that stuff is better in
> hardware. :)
>
> Thanks,
> Matt
>
> --
> Matthew Zito
> GridApp Systems
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--
Author: Jesse, Rich
INET: Rich.Jesse_at_qtiworld.com
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Received on Thu Aug 14 2003 - 08:59:22 CDT
