ok... We all know that scsi has lower seek times and a bunch of other things that make it a lot better that ide.
I'll grant u all that.
<Disclaimer>
I do not work for any hw companies.
Opinions are my own.
I like SCSI.
I'm not advocating any hardware specifically
sorry for the long post
</Disclaimer>
the one thing that IDE has it's the only cheap solution we have vs scsi. IDE Raid makes things a little better but has these down sides
- More CPU Util
- Doesn't help seek times
Down side to scsi raid (other than cost)
- Doesn't help seek times
ok... for general reference scsi has ~ half the seek time of ide. I'm not being exact and i didn't go try to find the fastest seek times for both tech. this is just avg times.
we have scsi which is relatively expensive, but has very fast seek times and when combined into an array hands down the fastest sustained xfer rates.
ide is cheap... has relatively slow seek times and does fairly well during sustained xfer esp in an array.
SCSI = Performace platforms
IDE = everything else
some price comparisons... I didn't go find the largest SCSI u160 drive cause that's a moot point as far as expense. I did go find a 120gb for ide only for a price comparison. everything else is based upon some ppls perception that u don't need that much space. so i found the lowest price for some of the better hardware out there. notice i didn't claim the best.
seagate 18.4gb 10k rpm $145 1mb cache
fujitsu 18.4gb 10k rpm $153 8mb cache
adaptec aha 19160 u160 $147
mylex accelraid a352-2-32nb u160 raid 32mb cache $598
adaptec ada-2100s u160 raid 32mb cache $393
$292 for 1 drive and 1 controller
$683 for 2 drives and 1 raid controller
wd 120gb 7200rpm $177
seagate cuda 20gb 7200rpm $60
wd 20gb 7200rpm $62
HighPoint RR100 $35
Tekram DC200 $27
Promise FT100Tx2 $69
Adaptec 1200A $85
$177 for 1 drive (generally all mobos have ata100) or
$60 for 1 drive (for those who don't need 120gb)
$147 for 2 drives and 1 raid controller
ok it's 2 drives for the smallest array u can have.
i took the price of the cheapest controller so that way u have at least some kind of intro price to raid.
as far as serial ata goes, it's hard to say one way or the other... It'd be pure speculation on my part. There is the point that u have to run at much higher frequencies to get the same amount of data over a serial connection as u get over parallel. however, it'd seem really foolish to try to bring in a new tech that'd be slower. It has been shown that serial can compete with parallel (i.e. rambus) when used creatively (i.e. the quad pumped bus or whatever they call the bus for the P4). The only thing that comes to my mind as being a problem would be the cable length. I'm not sure how well high frequencies are preserved over long distances but then again how high will the frequency be for serial ata? it still has to travel at most 18(?) inches.
Just some things to think about.
Cyph3r
P.S. sorry about the long post
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