Want to win a PS4? Go Premium and enter to win our High-Tech Treats giveaway. Enter to Win

x
?
Solved

Dell 6800 PERC4 adapter: read/write cache

Posted on 2007-04-06
6
Medium Priority
?
617 Views
Last Modified: 2008-09-13
I have Dell 6800 server with PERC4 Ultra320 SCSI RAID controller with 256 MB cache.

I did some tests and I have found, that this cache is probably divided to cca 240 MB read cache and only 7 MB write cache. I have used xdd test tool to bypass filesystem cache and I was able to read 240 MB files with very high transfer rate while with 245 MB files transfer rate dropped to about 30%. Write test showed this transfer rate drop when file size changed from 7 MB to 8 MB.

I'd like to increase write portion of the cache. I'm using command line utility named megarc to set controller parameters and I can't see any parameter, that could affect cache division.

Does anybody know, whether it is possible to change the size of write cache on PERC4 controller ?
0
Comment
Question by:Jan Franek
[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
  • 2
  • 2
6 Comments
 
LVL 4

Expert Comment

by:BPiotrowski
ID: 18908490
Have you tried to set this in the Perc controller BIOS ? There should be a way to set the controller for how you want the cache to be divided - default I believe is 50/50.

-Bart
0
 
LVL 14

Author Comment

by:Jan Franek
ID: 18916298
Hi Bart,
do you know, where in controller BIOS can be this setting ? I haven't found it yet.
Jan
0
 
LVL 4

Expert Comment

by:BPiotrowski
ID: 18917394
Are you able to get into the BIOS controller ? once you are in - on the virutal disk setting - there should be an allocation of cache - read/write percentage. Hmmm.. it may also be only if you create a new virtual disk....which is not going to help you. - Do you have the newest firmware for the raid controller ?
0
 
LVL 14

Author Comment

by:Jan Franek
ID: 21247907
Sorry, I have forgotten, that this is still open.

I have upgraded firmware and BIOS too, but there's no way to change cache allocation. So probably the answer to my question is: No, it can't be done.
0
 
LVL 1

Accepted Solution

by:
Computer101 earned 0 total points
ID: 22469008
PAQed with points refunded (500)

Computer101
EE Admin
0

Featured Post

Keep up with what's happening at Experts Exchange!

Sign up to receive Decoded, a new monthly digest with product updates, feature release info, continuing education opportunities, and more.

Question has a verified solution.

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

INTRODUCTION The purpose of this document is to demonstrate the Installation and configuration, of the HP EVA 4400 SAN Storage. The name , IP and the WWN ID’s used here are not the real ones. ABOUT THE STORAGE For most of you reading this, you …
Every server (virtual or physical) needs a console: and the console can be provided through hardware directly connected, software for remote connections, local connections, through a KVM, etc. This document explains the different types of consol…
In this video, Percona Director of Solution Engineering Jon Tobin discusses the function and features of Percona Server for MongoDB. How Percona can help Percona can help you determine if Percona Server for MongoDB is the right solution for …
In this video, Percona Solutions Engineer Barrett Chambers discusses some of the basic syntax differences between MySQL and MongoDB. To learn more check out our webinar on MongoDB administration for MySQL DBA: https://www.percona.com/resources/we…
Suggested Courses

610 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