Did you know LQ has a Linux Hardware Compatibility List?
Go Back > Forums > Linux Forums > Linux - Server
User Name
Linux - Server This forum is for the discussion of Linux Software used in a server related context.


  Search this Thread
Old 09-20-2011, 04:02 PM   #1
Registered: Jul 2006
Location: Italy
Distribution: Ubuntu 11.04, Debian, OS X
Posts: 71

Rep: Reputation: 16
Software RAID-5 expandability

Hi guys,
I am currently running my homeserver with 2 TB disks in RAID-0. I am running out of space and I will soon migrate it to a RAID-5, throwing in an additional 2 TB drive (all the data on the current drives will be transferred somewhere else, so basically I'll be creating a RAID-5 array from scratch).

Eventually I will run out of space once again, and I'll have to expand the array.
I have found this guide that explains a simple way to expand a RAID-5 array, but I have a question about that: if I add another drive in such way, will I lose redundancy? If I understand correctly, RAID-5 calculates parity data that will allow it to run even if one of the 3 drives is broken, but what happens if you have more than 3 drives?

I experimented a little in a VM and it seems that it works fine, even disconnecting one (virtual) drive from the VM.

Thanks in advance for your help.
Old 09-20-2011, 06:25 PM   #2
Registered: Oct 2010
Location: Cleveland
Distribution: Slackware, Fedora, RHEL (4,5), LFS 6.7, CentOS
Posts: 258

Rep: Reputation: 29
it does not matter how many drives you have in a raid 5, you can only lose 1 with the ability to recover and use that array in a degraded state... anything else and you done for...

Last edited by zer0signal; 09-20-2011 at 06:26 PM.


mdadm, raid, raid5, software raid

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
LXer: How To Resize RAID Partitions (Shrink & Grow) (Software RAID) LXer Syndicated Linux News 1 05-01-2009 12:02 PM
LXer: Benchmarking hardware RAID vs. Linux kernel software RAID LXer Syndicated Linux News 0 07-15-2008 03:50 PM
Adding an old software-RAID array to a software-RAID installation.. Boot problems GarethM Linux - Hardware 2 05-05-2008 03:16 PM
Will a ex - Software Raid 1 disk boot without Raid software? carlosruiz Linux - Software 0 05-27-2006 01:12 PM
moving system from ide software raid to new box with scsi raid ftumsh Linux - General 0 10-28-2003 09:34 AM

All times are GMT -5. The time now is 11:37 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
Facebook: linuxquestions Google+: linuxquestions
Open Source Consulting | Domain Registration