question about software raid

Discussion in 'HOWTO-Related Questions' started by Ovidiu, Sep 19, 2006.

  1. Ovidiu

    Ovidiu Active Member

    hi there,


    I followed a slightly different how to for setting up a root server at strato than this: http://www.howtoforge.com/perfect_setup_debian_sarge_strato

    but it is basically unimportant for my question.

    What do I do in case one of the harddisks of my software raid fails? How do I recover? what do I have to do?

    I guess the server support staff will exchange the hard disk with another one of the same size and brand so what is the next step I have to do?
     
  2. Ben

    Ben HowtoForge Supporter

  3. Ovidiu

    Ovidiu Active Member

    thx, its not about what I prefer but about what I can afford :)

    the system I could afford and that suits my needs best, offers 2 HDs so I used them to make a software raid...

    I was just curious what I should do in case it fails...
    seems the system will go on using only one HD, but how will mdam tell me that one HD failed? sending mail to root?
     
  4. Hans

    Hans Moderator

    Hi,

    On my Dell PowerEdge 1425 SC and Debian Sarge (unofficial 64 bit), i've software raid too.

    I have configured RAID 1 using the Debian CD.
    When one HDD crashes for example, i will receive an email from the system with the message that the RAID array is broken. So i can take action.

    After that i can replace the crashed HDD for a new one.
    Then Software RAID will rebuild & synchronise both HDD's.
    Synchronising costs some time, but that is only after setting up RAID 1.

    That's all.
     
    Last edited: Sep 19, 2006
  5. Ovidiu

    Ovidiu Active Member

    Ok, thx. thats exactly the info I was looking for: if I have raid1 set-up via software raid, I will be notified if a HD breaks down and when the HD is replaced it will automatically be rebuilt.
     
  6. ikaros

    ikaros New Member

    I am not sure if the reconstruction is done automagically in software-raid. All I know is that after your replace the defective HDD, you have to do something like this (depending on what drive you have, e.g. sdx for SATA):

    raidhotadd /dev/md0 /dev/sda

    Take a look at this: http://www.tldp.org/HOWTO/Software-RAID-HOWTO-8.html#ss8.1

    Also, if you have partitions in your drive, maybe you should create them with fdisk before you run the above command.

    If you need perfect Linux compatibility and good performance, after A LOT OF SEARCH I found out that if you are on a tight budget host-based SATA RAID controllers with Silicon Image 3114 chipset is the way to go, and if money is not an issue full-hardware controllers like LSI Logic MegaRAID SATA 150-4 (4 channels) or LSI Logic MegaRAID SATA 150-6 (6 channels) is the best option.



    How do you setup the system to notify you with email in case of a drive failure?
     
    Last edited: Sep 22, 2006

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