Download your favorite Linux distribution at LQ ISO.
Go Back > Forums > Linux Forums > Linux - Newbie
User Name
Linux - Newbie This Linux forum is for members that are new to Linux.
Just starting out and have a question? If it is not in the man pages or the how-to's this is the place!


  Search this Thread
Old 03-09-2015, 10:58 PM   #1
LQ Newbie
Registered: Feb 2015
Posts: 14

Rep: Reputation: Disabled
Question about RAID disk

Hello All;
I was able to create a RAID array mode 1 using two 4TB drives but the resulting array (md0) is listed as "4.0 TB Unknown" in the Disks gui.

I am wondering if this is correct to leave it as-is or if I have to set this to a partition type (ext4?)for it to work properly?


Old 03-10-2015, 03:20 AM   #2
Senior Member
Registered: Dec 2010
Location: Internet
Distribution: Linux Mint, SLES, CentOS, Red Hat
Posts: 2,385

Rep: Reputation: 477Reputation: 477Reputation: 477Reputation: 477Reputation: 477
As you said you have created the RAID but to use it you have to create filesystem. I mean you have configured RAID but it is still raw disk without any format.
Old 03-10-2015, 05:42 AM   #3
LQ Newbie
Registered: Feb 2015
Posts: 14

Original Poster
Rep: Reputation: Disabled
Thanks. The reason I was questioning is because I formatted both disks to ext4 BEFORE creating the RAID but the resulting md0 disk was not formatted.

Old 03-10-2015, 11:36 AM   #4
Registered: Oct 2013
Location: IN, USA
Distribution: Arch, Debian Jessie
Posts: 813

Rep: Reputation: 264Reputation: 264Reputation: 264
I hope you didn't have anything saved in those ext4 partitions before you made the RAID, because it probably isn't there now.

The RAID will format the disks in some format (I don't know, but it's only readable as a RAID.). You have to format the RAID itself (usually /dev/mdX). You can use Gparted or any other partitioning tool.
Old 03-10-2015, 02:46 PM   #5
LQ Newbie
Registered: Feb 2015
Posts: 14

Original Poster
Rep: Reputation: Disabled
Thanks for responding, maples;
No I didn't have anything on those ext4 partitions when I created the RAID. This is a new media server I'm building.

Thanks - OK I'll format to ext4 using Parted (or GParted).

Old 03-10-2015, 05:54 PM   #6
Registered: Mar 2008
Posts: 16,883

Rep: Reputation: 2498Reputation: 2498Reputation: 2498Reputation: 2498Reputation: 2498Reputation: 2498Reputation: 2498Reputation: 2498Reputation: 2498Reputation: 2498Reputation: 2498
Be sure you get the raid array and not a single disk. Also partition it. has some tips.

Gparted ought to show you the array.
Old 03-10-2015, 09:20 PM   #7
Fred Caro
Registered: May 2007
Posts: 999

Rep: Reputation: 166Reputation: 166
The previous link gives some good tips but note that the kernel is 2.6... and it makes a difference which version of mdadm you use and where you put the /boot directory. Also bare in mind that hdd's of the same make/type/age are likely to fail at a similar time.



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
[SOLVED] Question about Raid disk format vdemuth Slackware 3 12-08-2012 02:54 AM
ICP raid controller, no automatic rebuild of raid 5 after replacing bad disk Linux - Newbie 3 12-14-2009 10:54 AM
Fedora 11 RAID 1, Disk failure - How to boot from the single working disk NothingSpecial Linux - Hardware 2 10-18-2009 06:20 PM
[SOLVED] Software RAID (mdadm) - RAID 0 returns incorrect status for disk failure/disk removed Marjonel Montejo Linux - General 4 10-04-2009 06:15 PM
Software Raid Question(install new disk with mdraid) poj Linux - Software 3 05-23-2006 05:50 AM > Forums > Linux Forums > Linux - Newbie

All times are GMT -5. The time now is 10:59 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