Solved

Ultra 160 vs Ultra 320 SCSI Hard Disk

Posted on 2008-06-18
11
2,499 Views
Last Modified: 2011-10-19
I have an old server, an IBM xSeries 360, which according to the documentation, can only support up to Ultra160 disks.
I'm having a hard time finding Ultra160 disk, while there are a lot of Ultra320 on the market.
I wonder if an Ultra320 disk will still work in this server.

I was thinking if getting a few of these: http://www.seagate.com/ww/v/index.jsp?locale=en-US&name=st3146707lc_cheetah_10k7_ultra320_scsi_146_gb_hard_drive&vgnextoid=cd0d99f4fa74c010VgnVCM100000dd04090aRCRD&vgnextchannel=4161d21c2f32b010VgnVCM100000dd04090aRCRD&reqPage=Model

For my experience in IDE and SATA disks, when you get a disk with newer and faster technology in an old equipment, the only problem is that the full speed/transfer is not achieved, however, they still work. But in SCSI disks I have no idea.

I'm attaching the IBM xSeries 360 Specs Sheet.


X360.pdf
0
Comment
Question by:fischermx
  • 3
  • 3
  • 2
  • +3
11 Comments
 
LVL 10

Expert Comment

by:0xSaPx0
Comment Utility
It would work. Performance would be terrible and the drives would fail much sooner.

I would not recommend doing this.
0
 
LVL 1

Author Comment

by:fischermx
Comment Utility
Really????? :(
Why?
0
 
LVL 10

Expert Comment

by:0xSaPx0
Comment Utility
The drives would have to "step down" in order to run at the slower speed, they are not designed to do this and would not do it well. In addition the SCSI controller may not even recognize the drives properly.

0
 
LVL 4

Expert Comment

by:albuitra
Comment Utility
ypu have to get the apropiate cables to connect the 320 to 160
0
 
LVL 1

Author Comment

by:fischermx
Comment Utility
But they are all 80pins connectors... why different cables?

Actually, they don't even need cables, they are hot pluggable!


0
IT, Stop Being Called Into Every Meeting

Highfive is so simple that setting up every meeting room takes just minutes and every employee will be able to start or join a call from any room with ease. Never be called into a meeting just to get it started again. This is how video conferencing should work!

 
LVL 10

Expert Comment

by:0xSaPx0
Comment Utility
Let me be clear, this will end badly for you and I don't recommend pursuing this route.

I also believe that your SCSI controller in this system may not detect the drives or be able to communicate with them.
0
 
LVL 34

Assisted Solution

by:jamietoner
jamietoner earned 200 total points
Comment Utility
They will work fine. These statements "they are not designed to do this and would not do it well" WRONG and "Performance would be terrible and the drives would fail much sooner" also WRONG. U320 drives are backwards compatible and should work without issue on a U160 controller, the performance will be the same as a U160 drive and will not affect the drive's MTBF.
0
 
LVL 1

Author Comment

by:fischermx
Comment Utility
jamietoner:

Actually, I've just found another reference right here in EE, that agrees with you:
http://www.experts-exchange.com/Storage/Misc/Q_23173408.html

Also, in this website:
http://www.scsita.org/aboutscsi/ultra320/faq.html

Someone here, made the same question:
http://www.motherboardpoint.com/t146869-ultra160-vs-ultra320.html

And here:
http://hardware.mcse.ms/archive48-2005-7-209882.html

0
 
LVL 70

Expert Comment

by:garycase
Comment Utility
The drives will work fine !!   The performance of the drives is NOT impacted at all --> they still rotate at the same speed; the seek times aren't any different; etc.   The ONLY difference is that the interface speed is different (Ultra 160 vs Ultra 320).   ... and it certainly has NO impact on the reliability of the drives !! [r.e. "... the drives would fail much sooner ..."].

0
 
LVL 70

Accepted Solution

by:
garycase earned 300 total points
Comment Utility
... in fact, unless you're using an array which could support a sustained transfer rate higher than Ultra 160 speeds, the ONLY time there would be any difference in performance (compared to an Ultra 320 controller) will be in transfers to/from the drive's buffers => a very low % of disk operations.

Bottom line:  Buy the disks you listed.  They'll work just fine :-)

0
 
LVL 95

Expert Comment

by:Lee W, MVP
Comment Utility
I complete agree - these drives should be just fine.... I have no idea what 0xSaPx0 is talking about who where he's getting his information.
0

Featured Post

New My Cloud Pro Series - organize everything!

With space to keep virtually everything, the My Cloud Pro Series offers your team the network storage to edit, save and share production files from anywhere with an internet connection. Compatible with both Mac and PC, you're able to protect your content regardless of OS.

Join & Write a Comment

This is about my first experience with programming Arduino.
Great sound, comfort and fit, excellent build quality, versatility, compatibility. These are just some of the many reasons for choosing a headset from Sennheiser.
This video Micro Tutorial explains how to clone a hard drive using a commercial software product for Windows systems called Casper from Future Systems Solutions (FSS). Cloning makes an exact, complete copy of one hard disk drive (HDD) onto another d…
In this seventh video of the Xpdf series, we discuss and demonstrate the PDFfonts utility, which lists all the fonts used in a PDF file. It does this via a command line interface, making it suitable for use in programs, scripts, batch files — any pl…

762 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

8 Experts available now in Live!

Get 1:1 Help Now