[ale] RAID "inexpensive" disks?

[James S. Cochrane]

Inexpensive compared to DASD on mainframes.  The RAID acronym has been 
around a LONG time :-)

James

At 11:28 PM 9/30/02 -0400, James P. Kinney III wrote:
>Yep, scsi doesn't qualify as "inexpensive". But the big difference is in
>the anticipated lifetimes as measured by manufacturers warranties.
>
>Most IDE drive come with a 1 year. Some have only a 90 day. A few
>actually have a longer, 3 year warranty. That count is dropping fast.
>
>SCSI drive almost always come with at least a 3 year warranty. Many come
>with a 5 year warranty. The are built to PERFORM for extended periods of
>time. IDE is engineered to be used intermittently.
>
>A big factor in the price difference is the degree of on-disk brains
>that scsi has compared to IDE. IDE drives are pretty dumb.
>
>RAID stuff:
>
>Software raid is pretty cool. Using a trio of drives, I had a small boot
>drive and a pair that made up a raid mirror for the user data. It is not
>as fast as hardware raid, but works on nearly anything. Good quality IDE
>drives and software RAID are "The Poor Man's RAID Solution".
>
>Of course, 15k rpm Ultra160 SCSI Cheetahs on an Adeptec 3 channel RAID
>in a RAID 5 setup is screaming fast.
>
>Cost is NOT a linear relation to data through put :(
>
>On Mon, 2002-09-30 at 21:56, Stephen Turner wrote:
> > uh, just an observation but :-p raid is typically used with scsi disks,
> > which arent inexpensive, on the contrary, they seem to be storing less
> > than ide and more expensive.... oh well on to my question, since ide is
> > inexpensive, and reaching nice speeds would it be appropriet to use ide in
> > a raid formation? would it be near performance of normal raid with scsi? i
> > was interested in opinions from experienced guys and i dont know any
> > myself except this mailing list so :), also whats your opinions on best
> > performance/redundant configurations? i noticed raid 0,1 configuration
> > seemed to be nice, striping and mirroring together (which is possible
> > right?) running 2 raid arrays, each with 3 or so disks stripped and the
> > first and second array mirrord, .... 6 disks total, one fast and redundant
> > array right? im sorry for the possible ignorance in this letter, i have no
> > experience with raid and im just trying to get berrings and such :) also
> > just wanted to start a convo too so :) thanks for your time
> >
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>GPG ID: 829C6CA7 James P. Kinney III (M.S. Physics)
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