server...scsi or eide?

[PYROMANIAC]

answered it myself..i wish i could delete this post

[Da Whip]

The cost of comparable SCSI disk space is too expensive, unless you have very deep pockets. SCSI is still faster, but IDE is alot closer.
80gig IDE $100
80gig SCSI $375+
For that price you could have 2-120gig raid setup.

[parkan]

Originally posted by Da Whip
The cost of comparable SCSI disk space is too expensive, unless you have very deep pockets. SCSI is still faster, but IDE is alot closer.
80gig IDE $100
80gig SCSI $375+
For that price you could have 2-120gig raid setup.

Don't get me started on how SCSI raid is better than IDE raid :rolleyes:

[donny_paycheck]

Originally posted by parkan


Don't get me started on how SCSI raid is better than IDE raid :rolleyes:

Heh...it totally is.

Click the dual athlons link in my sig to see a sweet IDE RAID 5 though, which cost a ton less than SCSI would've.

[Penguin4x4]

I've been meaning to ask you donny about RAID 5: How would you describe how it compares to RAID 0, 10 and 0+1?

[PYROMANIAC]

if I understand raid5 right the only advantage it would have over 1 or 10 would be you can use basically any amount of discs you want and put it on raid5...the write is slowed down but the read isnt...hope it helps:p

[Penguin4x4]

I was just wanting to see what would be, on average, the fastest?

www.acnc.com/img/raid/05.gif
www.acnc.com/img/raid/10.gif
www.acnc.com/img/raid/0p1.gif

[PYROMANIAC]

0 is superior in speed to any raid but its the only non-redundant array...5 usually takes more than 3 HD's and is generally slower on writes..1 is the best for you if you crave performance w/ fault tolerance..

10 is kinda the best of both worlds i would guess but you need 4 drives it combines striping and mirroring but w/out parity and it has fast data access and single drive fault tolerance...

if that makes any sense

it basically depends on what you need.. raid5's transfer rates are higher than raid10 but nothing compares to raid0...although you have a low data reliability..lose the stripe and your out of luck:/


edit: raid3 is the fastest normal raid and is best for single user setups..and it also keeps a drive dedicated to parity and error correction

[Penguin4x4]

Do they make RAID 3 cards for IDE setups? Google can only find RAID Servers. :mad:

[PYROMANIAC]

wow i dont know if your going to find raid3,5 ide..i cant find anything either:mad: :mad:

the only thing i found, and as much as i hate them, is this article in THG http://www17.tomshardware.com/storage/01q4/011023/

and on the 3rd or 4th page they talk about this promise raid card that supports 4 channels and uses the 64 bit(66mhz) pci so it would take the trnsfer rates clear up to 266mb/s, or so THG says and i wouldnt take what they say that serious:), anyways they dont say it but that promise card maybe able to support raid3,5 but i dunno


edit: it looks like scsi is usually supported for raid3,5 so were stuck with using raid10 instead:mad:

[donny_paycheck]

Good article on all the levels. (http://www.raidweb.com/whatis.html)

Another one. (http://www.acnc.com/04_01_00.html)

Yet another. (http://www.uni-mainz.de/~neuffer/scsi/what_is_raid.html)

Those are all more academic documents. this one (http://www.arstechnica.com/paedia/r/raid-1.html) is from ARS technica and is geared more toward the end user, but does not discuss RAID 5.

Here is my post about RAID 5 from the thread about my dual AMD system (http://forums.overclockers.ws/vb/showthread.php?s=&threadid=88502&perpage=30&pagenumber=2).

RAID 5 is called "striping with parity". It offers redundancy, meaning if a disk in the array fails you can swap it and lose no data, but it uses the space much more effeciently than RAID 1 or RAID 0+1 (sometimes called RAID 10). My RAID 5 is 120gb of total disk space, but 90gb of it is usable. The remaining 30gb is reserved for parity information. For example, each drive stores parity data, or a "skeleton" of the other three drives on it. This way if one drive fails, when the new one is installed the controller can reconstruct the entire disk using combinations of the parity data on the three disks that did not fail. It's really sweet how it works. It isn't used nearly as much as RAID 0 because it requires a dedicated controller to process the striping algorithms because they are so complicated. It also doesn't offer a performance increase, although in my case I noticed one because I was moving from a CPU-reliant RAID card to one that used no CPU time. It is most often used in servers where uptime is critical because you can even hot-swap and rebuild a bad disk without taking down the array - in most cases. An example would be the server for these forums. I'd bet my money that skip runs some flavor of RAID 5.
So, RAID 5 is good for more critical applications, but still makes pretty good use of disk space and is good with speed too.

See the article (http://www.overclockers.com/tips048/) I wrote about my dual AMD system for the front page, in which I used a RAID 5.

[PYROMANIAC]

nice info..might wanna copy and paste that thread onto the sticky so it'll stay up there. gonna bookmark those sites myself

[donny_paycheck]

Originally posted by PYROMANIAC
nice info..might wanna copy and paste that thread onto the sticky so it'll stay up there. gonna bookmark those sites myself

Good idea, just did...

[PYROMANIAC]

is your 120gb raid5 ide or scsi?

[donny_paycheck]

Originally posted by PYROMANIAC
is your 120gb raid5 ide or scsi?

ATA100 IDE...SCSI would've cost me over $1200. This cost me $500 and gets the job done, if not as fast.

http://www.overclockers.com/tips048/

[PYROMANIAC]

do you use a pci controller or, if you have them, the raid controllers on your mobo?

[Penguin4x4]

That AC&NC site is what I have been looking at mostly. Hmm, seems I'm goin RAID 5,(Probably next year, not enough funds.):) 64bit PCI 3Ware card, Pyro.

[PYROMANIAC]

sounds like something i could implement in the filer server i've been planning to build...raid53 looks interesting also

[Penguin4x4]

I liked 53 myself, but its impossible to find any controller cards!

[jajmon]

Promise has a raid 5 card for IDE, sx6000

www.promise.com

[Penguin4x4]

WOW, umm, are all RAID controllers that big? fullsize onboard DIMM slot, WHAT?:eek: :eek:

[PYROMANIAC]

thats......insane.......must.......have:beer:



edit: when it says " SX6000 includes six independent data channels for use with up to six drives" does that mean 1 driver per channel or does it go against IDE standards and 6 drives per channel???????

[Penguin4x4]

6 ATA-100/66/33 drives.

[PYROMANIAC]

ok thats what it sounded like but i had to propose the impossible:D

6 hd raid5 wouldnt be a bad thing to have:burn:

[Penguin4x4]

OK I had some fun with the Iwill DP400. That card would fit in the left most 64 bit slot. I help with copying RIMM slot :D

[PYROMANIAC]

i wonder if that bad boy would fit in the tyan tiger mpx

[Penguin4x4]

Just by looking at it it would fit. (http://www.tyan.com/products/html/tigermpx.html)