Latest LQ Deal: Latest LQ Deals
Go Back > Forums > Linux Forums > Linux - Hardware
User Name
Linux - Hardware This forum is for Hardware issues.
Having trouble installing a piece of hardware? Want to know if that peripheral is compatible with Linux?


  Search this Thread
Old 01-07-2004, 11:51 PM   #1
LQ Newbie
Registered: Jan 2004
Distribution: Mandrake 9.1
Posts: 16

Rep: Reputation: 0
Question Software RAID: 4 drives at once?

I'm currently using Mandrake 9.1 (although I plan to go to 9.2 soon...), and I'm curious if anyone knows if I can create a software RAID array between four hard drives. Two of the drives (36GB) are identical and on SATA, the other two are not identical (one 45, the other 160GB) on different IDE cables. I believe it is RAID 0 what I want...for striping instead of mirroring. I can create equaly sized partitions on each drive if necesary, but only two of the drives are of the same speed.

I've played a bit with hardware raid in windows with my onboard controller, and I believe that you need to have each of the drives (or at least partitions) to be of the same speed and size for the array to be effective. Will that cause me problems with my plan using software raid in linux?

How do you guys think this will work performance wise, and what complications I might run into. Unfortunately, won't be able to test it for at least another week until I can find the time.

Old 01-08-2004, 03:27 AM   #2
Registered: Jan 2004
Distribution: Debian and Gentoo
Posts: 39

Rep: Reputation: 15
I'm no expert but I wouldn't build a 4-disk raid in your configuration. I would go with the 2 SATA disks only. You won't gain a lot of performance if you add slower disks to the mix, and I think you'll lose the rest of the big disk.

What kind of controllers are those disks on ?
Old 01-08-2004, 10:21 AM   #3
LQ Newbie
Registered: Jan 2004
Distribution: Mandrake 9.1
Posts: 16

Original Poster
Rep: Reputation: 0
My motherboard is an Asus A7N8X Deluxe. So aside from the onboard SATA, it uses the Nvidia MCP-T southbridge to control the regular ATA drives. The onboard SATA RAID controller has its own chip on the motherboard separate from the southbridge so the only real limitation I can think of is the speed of the southbridge and its communication to the northbridge.

I understand what you mean by adding the slower drives to the array would slow down the faster hard drives. But I still wander if I wouldn't see an even larger performance gain from the increase in the spread of the data across the drives. I mean, only a fourth of all the data is being written on each drive instead of a half. So even if the faster drives are being slowed down by the slower in the array, the overall output (in theory) would still be much greater.

Also, I'm worried that the cpu overhead for running an array across 4 drives might be too much of a burden. Perhaps it is something I will have to find out on my own.

Please correct me if I'm wrong...I obviously wouldn't be asking around here if I knew anything.


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

Similar Threads
Thread Thread Starter Forum Replies Last Post
Why can't I mount this md0 raid? (mdadm and software raid) cruiserparts Linux - Software 35 01-05-2013 03:35 PM
Adding additional drives/resizing drives in RAID arrays kheldar Linux - Hardware 1 10-19-2005 01:21 PM
Software RAID-5 to regular drives...Possible without complete reformat? andrewjschmidt Linux - Software 3 08-15-2004 10:18 AM
Upgrading hard drives on Software raid 1 boot drives. linuxboy123 Linux - General 0 12-11-2003 03:28 PM
moving system from ide software raid to new box with scsi raid ftumsh Linux - General 0 10-28-2003 09:34 AM > Forums > Linux Forums > Linux - Hardware

All times are GMT -5. The time now is 10:03 PM.

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