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> Scsi Drives, Not sure if this is the place to ask...
Termina
post Mar 17 2004, 10:13 AM
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I noticed on pricewatch that SCSI drives are quite cheap (47gig for 21 dollars, which includes shipping). Nifty. happy.gif

How diffrent are they from IDE (besides being gigantic in size), performance and install wise?

I'd like to buy one or two for my main computer, and move one of my 80 gigs to another computer. (One of my 80 gigs is full of anime and manga. Yes, full, and I don't need it to be on my main computer biggrin.gif)

How hard is this, and do I need to buy any additional hardware? (Vaugely remember hearing something about needing a PCI card for each SCSI drive). I have a newish motherboard, if that makes any difference.

I wouldn't post this here usually, but I cannot seem to find any good SCSI install guides on the net (atleast ones not in PDF, and here at school we cannot download files =/ ).


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Corey
post Mar 17 2004, 11:07 AM
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Well, in order to use SCSI drives, you need a SCSI controller card which is pretty much a PCI card that plugs into a free PCI slot, which you would connect all SCSI devices to.

http://www.ncix.com/products/index.php?minorcatid=1012

And where did you find SCSI drives so friggin cheap, that is the cheapest i've ever seen it. Just look at these prices:

http://www.ncix.com/products/index.php?minorcatid=110


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Termina
post Mar 17 2004, 11:15 AM
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http://www.pricewatch.com


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hughesjr
post Mar 18 2004, 07:47 AM
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Got to be careful with SCSI drives to get the correct ones:

See this page ... which is dated ... there is now ultra 320 scsi (they last showed a ultra 160).

The drive you are looking at is SCSI-II (aka Ultra-SCSI Wide on the chart in my link)... which is 40mb / sec and 5400rpm .... not very fast by todays standards. It also takes up (2) 3.5 hard drive slots.

These can be fairly fast IF you get 3 or 4 and use a hardware RAID card set for RAID 0 (striped). You can write to more than one drive that way and increase speed ... you can put upto 15 of these on one controller channel.

If you had only one of these on a regular controller, it might be slower than an ata-133 IDE drive.

I ran bonnie++ on 3 PCs ... here are some of the results (I just ran them):

--------------------Sequential Output------ --Sequential Input- --Random-
---------------Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
--------------K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
WhiteBox------18027--98-43510--57-19589--17-21065--85-53503--30-149.8--1
Myth----------14508--96-50805--38-21501--12-14301--94-44198--13-150.2--0
P-III-800------9963--85-34936--44-13096--18-11924--84-28790--25-133.1--0


On the above 3 machines:
WhiteBox is (3) 36gb UltraSCSI 160 drives (with hardware raid 5, 72gb diskspace formated) 10K rpm, dual 1.8gb processors, 2gb RAM

Myth is a 120gb ATA-133 with 8mb cache (Western Digital) 7200rpm, dual 1.8gb processors, 3gb RAM

P-III-800 is 60gb ATA-133 with 2mb cache (Maxtor) 5400rpm, 1 PIII 800mhz processor, 768mb RAM

I could make the SCSI writing faster by using RAID 0 (no CRC), but basically a good IDE 133 with 8mb cache is fairly comparable with RAID 5 SCSI and IDE 5400 rpm is slower than IDE 7200 rpm.

I would expect that you would get about the same performance out of that the drive you quoted as you would get from an ata-66 5400 rpm IDE drive ....


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hughesjr
post Mar 18 2004, 07:59 AM
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Here is an hdparm -t comparison:

P-III-800
Timing buffered disk reads: 100 MB in 3.02 seconds = 33.11 MB/sec
Timing buffered disk reads: 100 MB in 3.02 seconds = 33.11 MB/sec
Timing buffered disk reads: 100 MB in 3.00 seconds = 33.33 MB/sec

Myth:
Timing buffered disk reads: 150 MB in 3.01 seconds = 49.91 MB/sec
Timing buffered disk reads: 150 MB in 3.01 seconds = 49.81 MB/sec
Timing buffered disk reads: 150 MB in 3.02 seconds = 49.73 MB/sec

Whitebox:
Timing buffered disk reads: 190 MB in 3.01 seconds = 63.12 MB/sec
Timing buffered disk reads: 192 MB in 3.02 seconds = 63.58 MB/sec
Timing buffered disk reads: 192 MB in 3.00 seconds = 64.00 MB/sec

Note that the read speed of the SCSI is very good .... (and in the other test) ... but with RAID 5 (and writing CRC info and DATA) the write speed is not quite as fast. Whitebox would basically be 33% faster writing (see my first post in this thread) if set to RAID 0 ... but if a hard drive crashed, I couldn't just swap in another drive and have it keep going ... so I'll take a little slower writing smile.gif


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Termina
post Mar 18 2004, 11:05 AM
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You mean there are SCSI drives that aren't freakin' huge? biggrin.gif Score... happy.gif


Oh, I might get one of the 18gig 10k or 15k rpm SCSI HDDs (would be nice just to have my OS's on, and I could store my files elsewhere)


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