Re: Hardware RAID vs. Software RAID

Not to me it doesn't. Two writes is still two writes. Does it make a difference whether software or hardware initiated it?

Brian

Chuck Lucas wrote:
>
> "Anna C. Dent" <anacdent_at_hotmail.com> wrote in message
> news:Ye%kb.79328$Ms2.67542_at_fed1read03...
> > Chuck Lucas wrote:
> > > "Daniel Morgan" <damorgan_at_x.washington.edu> wrote in message
> > > news:1066587431.204277_at_yasure...
> > >
> > >>You are correct on all points.
> > >>
> > >>But what version you implement can make a big difference. I'd stay away
> > >>from RAID 5 and vendor RAID
> > >>implementations with numbers like 2 and 4.
> > >
> > >
> > > What's wrong with RAID 5?
> > With Raid-5 the redundancy information is stripped across all disks.
> > For EVERY data block which is written to a RAID-5 volume the parity
> > block must be recalcuated and also written to disk. For all intents
> > and purposes RAID-5 doubles the number of write operations to disk.
> > As the percentage of WRITE to READ operations increases available
> > useful/application disk throughput decreases.
> >
> Wow! I didn't expect this much of a response. Thanx, folks, for the input.
> I, OBVIOUSLY, have some more research to do, huh?
>
> But I did notice throughout this that it seemed as though you guys were
> talking about software RAID5. I'm using hardware RAID5...does that make any
> difference in your opinions?
>
> Off to my research, now. Again, thanx!
>
> Chuck

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