Raid 0 is stripping with no parity. Raid 5 is stripping with Parity.
If you loose any of the disks in a Raid 0 array, you loose the array. If
you loose a disk in a Raid 5 array, you will run in a degraded mode. This
a very degraded mode. If you are looking for good I/O and high avalibility,
I would recommend going with Raid 5. For a better explaination of Raid,
I would look to this link.
It does a very good job of giving an overview of Raid. Sorry for any confusion
I caused.
Garl
"Garl R. Grigsby" wrote:
Dennis,
I am not THAT experienced with Raid on Linux, but from my experiences
with spec'ing out a Sun ES250, I would say that he should definitely go
with Hardware raid. As for the the question of Raid 0/Raid 5, you have to
ask yourself, can I be down while I rebuild? Raid 5 will give you slightly
better performance (depends on several things: raid controller cache, hdd
speed, network speed, and size of data files.), but if you loose a disk,
you will be down for a while. If you need a system that is never down, and
you want the performance advantages of Raid 5, then maybe look into a Raid
10 (stripped and mirrored). This is probably the best performance wise, but
is very expensive. I would check http://www.acnc.com/raid.html for a better
explanation.Hope that helps.
GarlDennis Soper wrote:
> On 24 Apr 2000, at 17:42, Garl R. Grigsby wrote:
>
> > I have just setup a soft-raid box. I downloaded the Software
> > Raid-howto, carefully followed the directions, and everything went
> > very smoothly. This is not a real high performance box, P200
> > overdrive, 128 Ram, 4 1GB SCSI HDD, Raid 5, BUT it does work very
> > well. I am currently using the raid mount on a samba server.
> > Currently the only thing that is on there are some audio files (mp3s)
> > while I test this out, but so far, the performance is excellent. What
> > were your questions?
>
> He wanted to know about hardware vs. software RAID, performance
> of RAID 5 vs. RAID 0, cost, TCO (as in time to administer), and the
> difficulty of setting it up.
>
> The box is probably going to be a single-processor PIII-600 with 1/2-
> 1 GB RAM that has an average of 75 users attached during
> business hours, and there are databases involved, but any number
> crunching is done on the workstations.
>
> Cheers,
> Dennis
> "Custard pies are a sort of esperanto: a universal language."
> --Noel Godin--
=============================================================================Garl R. Grigsby
Customer Applications Engineering - Analysis Team
-----------------------------------------------------------------------------Structural Dynamics Research Corporation Phone: (800)242-7372
TAO Americas Support Center FAX: (541)342-8277
1750 Willow Creek Circle Email: [EMAIL PROTECTED]Eugene, OR 97402 Internet:
http://www.sdrc.com
=============================================================================-FEA makes a good engineer great, and a poor engineer dangerous-
--
=============================================================================
Garl R. Grigsby
Customer Applications Engineering - Analysis Team
-----------------------------------------------------------------------------
Structural Dynamics Research Corporation
Phone: (800)242-7372
TAO Americas Support Center
FAX: (541)342-8277
1750 Willow Creek Circle
Email: [EMAIL PROTECTED]
Eugene, OR 97402
Internet: http://www.sdrc.com
=============================================================================
-FEA makes a good engineer great, and a poor engineer dangerous-
