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Thread: raid questions and problems with formatting

  1. #1
    Join Date
    Jul 2007
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    north tonawanda Ny
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    Ubuntu

    raid questions and problems with formatting

    i recently purchased 2 wd 500 gb sata drives and wanted to experiment with raid
    i figured that it would be easy but i was wrong
    first off i cant decide on weather to use fake raid software raid or some sort of hardware raid.

    my motherboard has the ability to do raid on up to 4 sata drives from bios
    i set it up to use the two mentioned above, then i burned and tossed in the live 8.04 32 bit cd
    it booted up fine, i went to synaptec installed dmraid and followed this guide
    https://help.ubuntu.com/community/FakeRaidHowto
    it seems to work fine up until i get to the creating files systems area this code with the obvious change for my raid controllers name

    mkfs -t ext3 /dev/mapper/via_hfciifae5
    mkfs -t reiserfs /dev/mapper/via_hfciifae7
    why is there a 5 and a 7 after the via_hfciifae??

    are these the partitions number ?
    i have 3 partitions just like the guide says
    i tried to format them with the partition editor but that seems to not work either
    i can format one or two of them but the third will not work and i get an error with that

    what am i doing wrong?
    asrock 890 delux fx4 amd 6 core 2.8ghz 4 gigs ddr 3 ram

  2. #2
    Join Date
    Feb 2007
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    Cameron Park CA USA
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    Ubuntu Development Release

    Re: raid questions and problems with formatting

    Are you using raid0 or raid1? You will not be able to boot from a raid0.

    I gave up dmraid several years ago and use only mdadm now. It has worked just fine, but I use a separate boot drive and have all my data on a raid5 array. Has worked just fine over the years.
    Regards, frank, at http://yantrayoga.typepad.com/noname/
    Homebuilt Lian-Li PC-Q30X Intel i5-4670K 4.0GHz, SSDs,16G RAM | Dell laptop E1505n, netbook 10n
    Oracle VBox w/ WinXP/Win8 running Xara Designer, PaintShopPro, and InDesign CS.

  3. #3
    Join Date
    Oct 2007
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    29

    Re: raid questions and problems with formatting

    Most 'hardware RAID' available on mother boards and controller cards (unless you are paying a lot of money) are not true hardware RAIDs.

    That being said I recommend using a software RAID. I have been using them for 5-6 years now and they work great. Sure they might be a bit slower then hardware but unless you are expecting a lot of high usage you will never notice this.

    I've always found RAIDs very easy to set up and recommend using the mdadm raid tools.

    Do not go with RAID0, this uses striping and if one of the drives fails the whole array is trashed. Stick with RAID1 or RAID5.

    First fdisk the drives and set them to fd Type (raid autodetect)

    then assemble the array with mdadm

    mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sda1 /dev/sdb1

    then format the raid

    mke2fs -j /dev/md0

    you can check the status of the build with

    cat /proc/mdstat

    now mount the array

    mount /dev/md0 /mnt/mountpoint

    *note: this is all off the top of my head so please double check the syntax and don't just copy pasta

  4. #4
    Join Date
    Jul 2007
    Location
    north tonawanda Ny
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    Ubuntu

    Re: raid questions and problems with formatting

    so why when i search about raid all the websites say software raid is horrible and hardware is the only way to go ?

    but on here i get the exact opposite?

    im looking for a performance increase and i have read that raid will help with that and im also looking for a reliability increase i hear raid will help with that too

    i will try the one you mentioned and see what happens until now im running off of one of my other drives so i can start from scratch and not have to worry about anything
    asrock 890 delux fx4 amd 6 core 2.8ghz 4 gigs ddr 3 ram

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