LinuxQuestions.org
Download your favorite Linux distribution at LQ ISO.
Go Back   LinuxQuestions.org > Forums > Linux Forums > Linux - Software
User Name
Password
Linux - Software This forum is for Software issues.
Having a problem installing a new program? Want to know which application is best for the job? Post your question in this forum.

Notices

Reply
 
LinkBack Search this Thread
Old 03-27-2010, 01:52 PM   #1
daudiam
Member
 
Registered: Mar 2010
Posts: 68

Rep: Reputation: 15
software raid not showing increased I/O throughput on Fedora 12 (copy time is high)


I have implemented level 5 software raid (of 4 partitions on a SINGLE external hard disk). Implementing it on a single hard disk doesn't serve much purpose, I understand, but I did it for demonstration purpose only. The problem is when I read from the raid device into my laptop's hard disk, the time taken to transfer a 900 MB file is about 4 minutes (4 GB RAM) whereas the rime taken to transfer it from a pen drive is 43 seconds. Isn't raid supposed to work faster. However, the write to the raid device is faster than to a pendrive.

Shouldn't it be taking data in parallel from the 3 partitions (as even a single disk has multiple heads) ?
 
Old 03-27-2010, 03:20 PM   #2
whizje
Member
 
Registered: Sep 2008
Location: The Netherlands
Distribution: Slackware64 current
Posts: 582

Rep: Reputation: 129Reputation: 129
No most disks have 1 head and when they have more heads these can not move independently so by implementing a software raid on 1 disk the heads have to move more instead of less.
 
Old 03-28-2010, 06:19 AM   #3
daudiam
Member
 
Registered: Mar 2010
Posts: 68

Original Poster
Rep: Reputation: 15
Thanks
 
  


Reply

Tags
raid5


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is Off
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
boot up time increased when made a DD copy of fedora core3 HDD abhi9 Linux - Newbie 1 06-23-2008 05:13 AM
LXer: How much can you improve network throughput with a high-end NIC? LXer Syndicated Linux News 0 04-10-2008 05:20 PM
Fedora 7: system time not showing properly. LoveKing Fedora 4 07-17-2007 11:14 AM
Install Fedora Core 5 onto High Point 372 (PATA) Raid erics_acvw Linux - Hardware 6 08-05-2006 12:13 PM
Software Raid: High Cpu Utilization ludwigs3rd Linux - General 4 01-17-2006 08:07 PM


All times are GMT -5. The time now is 05:17 AM.

Main Menu
My LQ
Write for LQ
LinuxQuestions.org is looking for people interested in writing Editorials, Articles, Reviews, and more. If you'd like to contribute content, let us know.
Main Menu
Syndicate
RSS1  Latest Threads
RSS1  LQ News
Twitter: @linuxquestions
identi.ca: @linuxquestions
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration