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Thread: Selecting Raid array for Ubuntu machine.

  1. #1
    Join Date
    Sep 2011
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    Selecting Raid array for Ubuntu machine.

    Hi, I am considering buying the following RAID Array for my storage needs:
    http://www.lacie.com/us/products/product.htm?id=10601

    Now I'll hook-up this array to my machine running Ubuntu 12.04, but I am not sure how RAID works in Ubuntu. Of course, the manufacturer's firmware is for Windows/Mac only. Will I be able to use the RAID from Ubuntu? I don't want the array to be reduced to individual drives, since I am paying for the cabinet and the RAID functionality.

    Another question along the same lines: could it be better to just get a cabinet of disks and set software RAID on them? What are the pros and cons of hardware-RAID vs. Software RAID?

    Thanks for your time.

  2. #2
    Join Date
    Apr 2007
    Location
    Kent, England
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    337
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: Selecting Raid array for Ubuntu machine.

    Can't see any Linux drivers for it yet, looks like it aimed at Mac,

    Raid info here
    https://help.ubuntu.com/community/In...n/SoftwareRAID

  3. #3
    Join Date
    Sep 2011
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    10

    Re: Selecting Raid array for Ubuntu machine.

    Umm, it appears that most manufacturers do not provide dedicated linux drivers for their drives.

    Sorry if this sounds stupid, but is it a 'waste' to buy a drive with hardware raid and then reconfigure it in Ubuntu to use software RAID? That is, is Hardware RAID better in some ways? I doubt I can find a Drive with Linux support so was wondering if all these drives that support mac/pc will work at all with Ubuntu.

  4. #4
    Join Date
    Oct 2011
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    Oregon
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    32
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    Ubuntu Development Release

    Question Re: Selecting Raid array for Ubuntu machine.

    Why not build yourself a back-end raid solution?

  5. #5
    Join Date
    Aug 2005
    Location
    Adelaide, SA, Australia
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    549
    Distro
    Ubuntu 13.10 Saucy Salamander

    Re: Selecting Raid array for Ubuntu machine.

    I definitely wouldn't recommend that LaCie RAID device for use with Linux. If you are setting this up on a Desktop machine I would recommend you purchase a couple of HDDs, put them in and set them up in a software RAID mirror.
    Hardware RAID is not better than software RAID. Often hardware RAID is fake RAID (using onboard fakeRAID chips) and this will be less efficient than a software RAID in Linux.
    If you are looking for an external RAID solution for a laptop or similar I would recommend something like a Synology NAS that you can connect to a network and use iSCSI or similar.
    P.S. Do NOT use RAID5

  6. #6
    Join Date
    Mar 2007
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    Christchurch, NZ
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    Re: Selecting Raid array for Ubuntu machine.

    Quote Originally Posted by NewAmercnClasic View Post
    Why not build yourself a back-end raid solution?
    There is little point in using raid with mythtv. Unless you value TV recordings very highly, the redundancy is unnecessary. Also any performance advantage is usually unnecessary.

    Just buy lots of 3GB hard drives and use storage groups if you want to do it in the backend. If one dies, well it's only TV and you'll recover most of it.

  7. #7
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    Sep 2011
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    Re: Selecting Raid array for Ubuntu machine.

    Thanks for you answers

    Ok, I do not intend to store movies or anything. I have critical scientific data in rather large (>2-3 GB) text files. I am the only one in my entire building who uses Ubuntu and the computer support of my organization refuses to help with anything that is not windows/mac (although they do it for clusters and servers so I don't quite get why).

    Disregarding for a while the fact that building an HDD array and setting up software RAID will be cheaper, can I just buy the LaCie product specified, format it with software RAID (I suppose I could use GParted to do that) and be good to go?

    Also, What's wrong with RAID 5?

  8. #8
    Join Date
    Mar 2007
    Location
    Christchurch, NZ
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    3,239

    Re: Selecting Raid array for Ubuntu machine.

    Quote Originally Posted by BavidDowman View Post
    Thanks for you answers

    Ok, I do not intend to store movies or anything. I have critical scientific data in rather large (>2-3 GB) text files. I am the only one in my entire building who uses Ubuntu and the computer support of my organization refuses to help with anything that is not windows/mac (although they do it for clusters and servers so I don't quite get why).

    Disregarding for a while the fact that building an HDD array and setting up software RAID will be cheaper, can I just buy the LaCie product specified, format it with software RAID (I suppose I could use GParted to do that) and be good to go?

    Also, What's wrong with RAID 5?
    I am not sure why you are asking in the mythbuntu forum then! Not that you are unwelcome here, but the participants tend to be focussed in a particular area

    And sorry I don't know the answer to your questions. But there is at least one answer that says these devices aren't great with linux.

    I also know that RAID does not equate to backup. I have been through a serious natural disaster and can tell you that the only good backup exists at least 100 miles from where you are, is automated, and doesn't rely on the trusted backup person picking up the backup drive on the way out of the building! Sure redundancy might lessen the chances of a single hard drive failure causing you to lose the data you have on it, but it is not everything proof by any stretch of the imagination.

    Also I query the sense in scientific data in 2-3GB files. Lose one block of 512b/4k (depending on the disk) and you lose the whole 2-3G. Break it down into smaller files if you can. But I say that without knowing the parameters of your problem

    You have a totally different problem than the average mythtv user. If I lose a 2-3GB file then it's probably something the children recorded, or last weeks news. I care slightly, but not much. You have the opposite situation!

  9. #9
    Join Date
    Sep 2011
    Beans
    10

    Re: Selecting Raid array for Ubuntu machine.

    Oops, I am really sorry. I don't know how I ended up posting in this forum.. I meant to ask this in the main forum. I am sorry if I was rude, and thanks for the help anyway.

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