Solved

Synchronous Data transfer!

Posted on 1997-12-05
7
199 Views
Last Modified: 2010-04-12
I'm gonna buy a UW scsi drive soon...
can someone explain when you attain synchronous data
   transfer
can the 40 MB/s rates only be attained while copying to mem?
also...is it safe to enable write caching?

thanks
Chris
0
Comment
Question by:hirbyfam
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 4
  • 3
7 Comments
 
LVL 12

Accepted Solution

by:
j2 earned 50 total points
ID: 1120722
40MB/S is an THEORETICAL value. i got a IBM DORS 2.1GB UWSCSI/3 drive, running with a AHAH2940UW controller.. and it gives about 4-6MB/sec.. 40MB/sec is the rate data is shuffled from the disks to the onboard cache ram on the disk. Write caching is safe if you can guarantee that the system wont fail (power failure etc etc)
0
 

Author Comment

by:hirbyfam
ID: 1120723
ah yes the DORS - Ultrastar ES
I'm gonna get the Ultrastar 2ES 4.3 I think - DCAS
and use a Tekram DC390F controller

thanks for answering

Chris
0
 
LVL 12

Expert Comment

by:j2
ID: 1120724
still... dont expect anywhere NEAR 40MB/sec, 40MB/sec is the theoretical max speed of the UWSCSI bus
0
Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 

Author Comment

by:hirbyfam
ID: 1120725
well yeah...
I'm interested in media streaming speeds, and sustained
   rates
I think zdnet needs to do an ultraSCSI drive test comparing
   sustained rates, even between different partitions
cuz that is mainly what I'm interested in...

cyas
0
 
LVL 12

Expert Comment

by:j2
ID: 1120726
well, then the Ultrastar is a good choice.. altough the Cheetah II vaporizes it.
0
 

Author Comment

by:hirbyfam
ID: 1120727
what about the Ultrastar 9ZX!
10,020 rpm
6.3 ms seek
17.x meg/sec minimum sustained
!!!!!!!
0
 
LVL 12

Expert Comment

by:j2
ID: 1120728
havent seen any benchmarks from an independant source yet.. but it is clearly intended as a "Cheetah killler"
0

Featured Post

Free Tool: ZipGrep

ZipGrep is a utility that can list and search zip (.war, .ear, .jar, etc) archives for text patterns, without the need to extract the archive's contents.

One of a set of tools we're offering as a way to say thank you for being a part of the community.

Question has a verified solution.

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

Suggested Solutions

In this article you will get to know about pros and cons of storage drives HDD, SSD and SSHD.
Monitor input from a computer is usually nothing special.  In this instance it prevented anyone from using the computer.  This was a preconfiguration that didn't work.
In an interesting question (https://www.experts-exchange.com/questions/29008360/) here at Experts Exchange, a member asked how to split a single image into multiple images. The primary usage for this is to place many photographs on a flatbed scanner…

756 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