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notes:hpc0:kdenson_projects:project_5 [2010/02/02 21:20] – kdensonnotes:hpc0:kdenson_projects:project_5 [2010/05/13 20:31] (current) – kdenson
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 +===Project 5 - RAID Arrays===
  
 +
 +RAID stands for Redudant Array of Inexpensive Disks, it can be incredibly useful for backing up your data, increaseing your disk speed and size, or both!
 +
 +There are different types of RAID arrays, for more information consult [[http://en.wikipedia.org/wiki/RAID|this wiki]]
 +
 +<WRAP square box>
 +
 +There are more types of raid than these, but these are the different types I used.
 +
 +   * RAID0 - Two or more disks with stripped data.
 +   * RAID1 - Two or more disks with mirrored data.
 +   * RAID5 - Three or more disks with parity.
 +   * RAID6 - Four or more disks with parity.
 +   * RAID10 - Four or more disks mirrored then stripped.
 +   * RAID01 - Four or more disks stripped then mirrored.
 +
 +</WRAP>
 +
 +   - To setup your virtual disks on your VM, you'll need to be on your VM server (the VM server I used was named vmserver02).
 +     - CD into /xen/conf and open up you're virtual machines .cfg file (my VM was named vm11)
 +     - In your .cfg file you'll want to add disks. To do this; Under the "disk devices" section add..
 +         * '''file:/xen/domains/vm11/disk_1.img,xvda3,w',''
 +         * '''file:/xen/domains/vm11/disk_2.img,xvda4,w',''
 +         * '''file:/xen/domains/vm11/disk_3.img,xvda5,w',''
 +         * '''file:/xen/domains/vm11/disk_4.img,xvda6,w',''
 +         * '''file:/xen/domains/vm11/disk_5.img,xvda7,w',''
 +         * '''file:/xen/domains/vm11/disk_6.img,xvda8,w',''
 +         * '''file:/xen/domains/vm11/disk_7.img,xvda9,w',''
 +         * '''file:/xen/domains/vm11/disk_8.img,xvda10,w',''
 +    - While still on your server..
 +      - cd ''/xen/domains/vm11''
 +         * dd ''if=/dev/zero of=disk_1.img bs=1M count=1024''
 +         * Do this for all disks, 1 through 8. 
 +         * dd is the data dump command, which will dump the data from the input file (if=/dev/zero) to the output file (of=disk_x.img). The /dev/zero file is a file full of infinate zeros. 
 +         * bs=1M is bit size equals 1 megabyte count=1024, do it 1024 times.
 +
 +      - At this point you'll need to install mdadm, mdadm will configure and allow the RAID array to functnuh.
 +      - Next, run the following 
 +         * ''modprobe raid0''
 +         * ''modprobe raid1''
 +         * ''modprobe raid5''
 +         * ''modprobe raid6''
 +         * ''modprobe raid01''
 +         * ''modprobe raid10''
 +      - Modprobing all the raid types will allow the system to reconize what raids you are going to run.
 +
 +-To create the virtual raid do the following..
 +
 +
 +==Raid0==
 +    * mdadm --create /dev/md0 --level=0 --raid-disks=2 /dev/xvda3 /dev/xvda4
 +    * This uses mdadm to create a new raid. It will uses disks 1 and 2 (xvda3 and xvda4) and set it to level 0.
 +    * mkfs.ext3 /dev/md0
 +    * mount /dev/md0 /mnt
 +
 +==Raid1==
 +    * mdadm --create /dev/md0 --level=1 --raid-disks=2 /dev/xvda3 /dev/xvda4
 +    * This will do the same thing as raid0, only setting up a raid1 instead of a raid0, obvisouly.
 +    * mkfs.ext3 /dev/md0
 +    * mount /dev/md0 /mnt
 +
 +==Raid5==
 +    * mdadm --create /dev/md0 --leve=5 --raid-disks=3 /dev/xvda3 /dev/xvda4 /dev/xvda5
 +    * Like raid0 and raid1 this will set up a raid 5, only it uses three disks instead of two, too account for parity.
 +    * mkfs.ext3 /dev/md0
 +    * mount /dev/md0 /mnt
 +    * 
 +==Raid6==
 +    * mdadm --crate /dev/md0 --level=6 --raid-disks=4 /dev/xvda3 /dev/xvda4 /dev/xvda5 /dev/xvda6
 +    * Again, like the previous raids this will set up raid6 using 4 disks.
 +    * mkfs.ext3 /dev/md0
 +    * mount /dev/md0 /mnt
 +
 +==Raid01==
 +    * For raid 01, we have to do a little bit more, but really, we're only using the same thing we've all ready done.
 +       - mdadm --create /dev/md0 --level=0 --raid-disk=2 /dev/xvda3 /dev/xvda4
 +       - mdadm --create /dev/md1 --level=0 --raid-disk=2 /dev/xvda5/xvda6
 +    * Here, we are creating 2 raid0 arrays, that we will then use together, as one, in our raid01
 +       - mdadm --create /dev/md2 --level=1 --raid-disks=2 /dev/md0 /dev/md1
 +    * You can see that rather than using the virtual disks, we use the two lower level raid's we set up, to act as the disks in the higher level raid.
 +    * mkfs.ext3 /dev/md0
 +    * mount /dev/md0 /mnt
 +
 +==Raid10==
 +    * For raid 10, we are going to do the same thing as RAID01.
 +       - mdadm --create /dev/md0 --level=0 --raid-disks=2 /dev/xvda3 /dev/xvda4
 +       - mdadm --create /dev/md1 --level=0 --raid-disks=2 /dev/xvda5 /dev/xvda6
 +    * Here, we are creating 2 raid0 arrays again, that we will once again use as our raid10.
 +       - mdadm --create /dev/md2 --level=1 --raid-disks=2 /dev/md0 /dev/md1
 +    * You can see that rather than using the virtual disks, we use the two lower level raid's we set up, to act as the disks in the higher level raid.
 +    * mkfs.ext3 /dev/md0
 +    * mount /dev/md0 /mnt

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