Solved

Ultra 160 vs Ultra 320 SCSI Hard Disk

Posted on 2008-06-18
11
2,515 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
ID: 21817199
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
ID: 21817238
Really????? :(
Why?
0
 
LVL 10

Expert Comment

by:0xSaPx0
ID: 21817272
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
Portable, direct connect server access

The ATEN CV211 connects a laptop directly to any server allowing you instant access to perform data maintenance and local operations, for quick troubleshooting, updating, service and repair.

 
LVL 4

Expert Comment

by:albuitra
ID: 21817289
ypu have to get the apropiate cables to connect the 320 to 160
0
 
LVL 1

Author Comment

by:fischermx
ID: 21817316
But they are all 80pins connectors... why different cables?

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


0
 
LVL 10

Expert Comment

by:0xSaPx0
ID: 21817349
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
ID: 21817628
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
ID: 21817660
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
ID: 21817828
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
ID: 21817850
... 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
ID: 21818722
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

Best Practices: Disaster Recovery Testing

Besides backup, any IT division should have a disaster recovery plan. You will find a few tips below relating to the development of such a plan and to what issues one should pay special attention in the course of backup planning.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

What do we know about Legacy Video Conferencing? - Full IT support needed! - Complicated systems at outrageous prices! - Intense training required! Highfive believes we need to embrace a new alternative.
A clone is a duplicate copy. Sheep have been cloned and maybe someday even people will be cloned, but disk cloning (performed by the hard drive cloning software) is a vital tool used to manage and protect data. Let’s look at what hard drive cloning …
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…
I've attached the XLSM Excel spreadsheet I used in the video and also text files containing the macros used below. https://filedb.experts-exchange.com/incoming/2017/03_w12/1151775/Permutations.txt https://filedb.experts-exchange.com/incoming/201…

860 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