I understand and agree with everything below, but still have a similar
question.
Say you need 36gig of space and only have one scsi channel(40Mbits/s),
using 4-9gig drives gives you what you need for capacity and max
throughput (4-10Mbit/s drives = 40Mbits/sec).
My question is, since the price difference between 9gig and 18gig drives
was only around $50ea., is there any performance (or other) problem
using 4-18gig drives? Throughput remains the same up to 72gig now.
Ernie
Dave Paris wrote:
> Mark wrote:
>
>> Greetings,
>>
>> I recently heard that Oracle performs better with smaller drives in a
>> RAID set (3 Gig to 9 Gig) and a larger drive size of say 32 Gig for
>> each drive is not preferable. Any truth to this? If so, why?
>
>
> The basic concept here is known as the 'spindle[1] to capacity ratio'.
> The larger the number of spindles and the smaller the amout of capacity,
> given sufficient resources to connect said spindles without inducing a
> bottleneck, will always result in better performance in a RAID 1 or 0+1
> configuration while providing an excellent boost in RAID 5 reads.
>
> This is one of those bizarre mysteries to me .. why do HD companies
> discontinue reasonably-sized drives (4.3G and 9G come to mind) and think
> "Oh, everyone wants our new 2347TB UltraMegaDrive[tm]! Think of how
> much they can put on it!". This seems to be a fairly universal (and
> amazingly stupid) mode of thinking. Other than the A/V industry, I'm
> having trouble coming up with a real, valid use of these monster drives
> where they actually benefit any application.
>
> I'd rather see them get creative and do something along the lines of
> shrinking the case size of the media and putting four 9G drives in the
> space of one 32G drive. (maybe a micro four-channel sub-controller?
> :shrug:)
>
> --dsp
>
>
> [1] the spindle is the cylinder/platter-capture/platter-rotator device
> perpendicular to the orientation of the platters in your hard disk. the
> "drive" in "hard drive", if you will. :)
Received on Thu Jan 25 2001 - 16:52:47 CST
