{"id":973,"date":"2009-05-30T06:00:55","date_gmt":"2009-05-30T12:00:55","guid":{"rendered":"http:\/\/www.cyberward.net\/blog\/?p=973"},"modified":"2009-06-29T10:38:48","modified_gmt":"2009-06-29T16:38:48","slug":"setting-up-linux-software-raid","status":"publish","type":"post","link":"http:\/\/www.cyberward.net\/blog\/2009\/05\/setting-up-linux-software-raid\/","title":{"rendered":"Setting up Linux Software Raid"},"content":{"rendered":"
This entry is part 3 of 3 in the series Building a NAS<\/a><\/div>

\"DualThis is part of our series on building a NAS. In this article we will get the box set up with a static IP address, and get your drives set up for RAID 1.<\/p>\n

We are assuming that at this point you have Ubuntu installed. We are gong to install software raid in a moment. The first thing I want to do is make sure we have a static ip address. Usually Ubuntu will start up with a dynamic ip address. This can make it more difficult to transfer files to this box, so lets make it static.
\n<\/p>\n

Setting a static IP address<\/h3>\n

Type ifconfig eth0, and you will see your current address.<\/p>\n

Lets make it static. Note, typing sudo in front of commands lets you assume the privileges of the administrator, or super user.<\/p>\n

sudo nano \/etc\/network\/interfaces<\/pre>\n
We will replace the text there with this text, which will assign 10.0.0.50 to our server, and assume the gateway is at 10.0.0.1:<\/p>\n
auto eth0\r\niface eth0 inet static\r\naddress 10.0.0.50\r\nnetmask 255.255.255.0\r\nnetwork 10.0.0.0\r\nbroadcast 10.0.0.255\r\ngateway 10.0.0.1<\/pre>\n
restart the network to get the new settings :<\/p>\n
sudo \/etc\/init.d\/networking restart<\/pre>\n
ifconfig eth0 and you should see the new settings.<\/p>\n
If you want to see a whole lot more networking commands, see here<\/a>.<\/p>\n
Finding out drives<\/h3>\n
Great. Now before we can put two drives into a RAID 1 array, we need to tell linux what drives we are going to use for this.<\/p>\n
How do we know what disks? I just type dmesg. This will scroll lots of stuff down the screen. If you are in the GUI at a terminal you can scroll. Otherwise type dmesg | less which will let you move through the text with the cursor keys.<\/p>\n
This is all the hardware that was found and initialized. You will first see the ataX with X being the number of the drive. You need to look for a section after this that has letters like hda or sda. The drives I am using are SATA drives and they are sda<\/strong> and sdb<\/strong>. I could tell by the size of the drives. (press Q to exit less if you need to)<\/p>\n
Partition\u00ac\u2020for Raid 1<\/h3>\n
Ok, lets tell Linux that we want those drives to be used for raid.<\/p>\n
sudo fdisk \/dev\/sda<\/pre>\n
[p] will list the partitions. If you had one previously, you will see it. Remove them. Press d for delete, then give a partition number. (no need if you only had one)<\/p>\n
Now add a [n]ew [p]rimary partition number [1] with default start and end (the whole disk)<\/p>\n
n [enter] p [enter] 1 [enter][enter][enter]<\/pre>\n
Now [p] again to verify that the partition is there. Note the type: 83. Type [l] to see all the types. We need to set the type to fd for Linux software raid.<\/p>\n
t [enter] fd [enter]<\/pre>\n
Now write the partition table and exit: w [enter]<\/p>\n
Now we repeat the process with the other drive.<\/p>\n
sudo fdisk \/dev\/sdb<\/pre>\n
And repeat the fdisk commands.<\/p>\n
Setting up mdadm for Raid1<\/h3>\n
Ok, now for Linux software raid. First we need to install it.<\/p>\n
sudo apt-get install mdadm<\/pre>\n
When I did this, I was prompted that citadel-server was being installed. This is what is used by default as the mail server. Mdadm is dependant on a mail server so it can mail you of failures. Pick an admin user and say no to external auth.<\/p>\n
Once installed you can build an array. I am going to use two drives in a RAID 1, mirrored setup. This duplicates all the data on both drives. They are mirrored. This is the command with my drives used. You will substitute for your devices:<\/p>\n
sudo mdadm --create --verbose \/dev\/md0 --level=1 --raid-devices=2 \/dev\/sda1 \/dev\/sdb1<\/pre>\n
This should tell you that the array \/dev\/md0 has started.<\/p>\n
If you would like to see when the array is built:<\/p>\n
cat \/proc\/mdstat<\/pre>\n
This will tell you how long it will take, or if it is done.<\/p>\n
Ok, that’s it for now.\u00ac\u2020 We will look at commands to manipulate the array in a later article in the series. Next up will be creating the resizable volumes on the array using LVM.<\/p>\n","protected":false},"excerpt":{"rendered":"
This entry is part 3 of 3 in the series Building a NAS<\/a><\/div>
This is part of our series on building a NAS. In this article we will get the box set up with a static IP address, and get your drives set up for RAID 1. We are assuming that at this … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false}}},"categories":[3,29,103],"tags":[47,164,165,22,134],"series":[330],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"","jetpack_shortlink":"https:\/\/wp.me\/pffAy-fH","jetpack_sharing_enabled":true,"jetpack-related-posts":[],"_links":{"self":[{"href":"http:\/\/www.cyberward.net\/blog\/wp-json\/wp\/v2\/posts\/973"}],"collection":[{"href":"http:\/\/www.cyberward.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.cyberward.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.cyberward.net\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"http:\/\/www.cyberward.net\/blog\/wp-json\/wp\/v2\/comments?post=973"}],"version-history":[{"count":0,"href":"http:\/\/www.cyberward.net\/blog\/wp-json\/wp\/v2\/posts\/973\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.cyberward.net\/blog\/wp-json\/wp\/v2\/media?parent=973"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.cyberward.net\/blog\/wp-json\/wp\/v2\/categories?post=973"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.cyberward.net\/blog\/wp-json\/wp\/v2\/tags?post=973"},{"taxonomy":"series","embeddable":true,"href":"http:\/\/www.cyberward.net\/blog\/wp-json\/wp\/v2\/series?post=973"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}