Configure non-RAID disk into RAID 1 array without losing data/restoring

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This topic contains 10 replies, has 4 voices, and was last updated by Avatar cruachan 10 years, 7 months ago.

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    Taw_Jackson
    Member
    #139432

    Hi there folks

    Apologies in advance if this is a goofy question.

    I have a server (HP DL) with a single disk hanging off a non-raid scsi adapter.

    What I would like to do, with the additon of another disk the same size as the existing disk, is create a RAID 1 array on another server which has (obviously) a raid controller.

    Now, I suspect the common response to this query is ‘you can’t create a raid 1 array using an existing disk without losing the existing os/data’.

    However, I am certain in a dark and distant part of my career that I witnessed someone do that very thing – though unfortunately I don’t know how it was done, nor can I remember the server hardware make.

    Having google’d, it seems that some raid controllers store the raid data in a chip on the raid card as opposed to on the disk, so the disk doesn’t need to be over-written when the raid array is created.

    And that somehow it is possible to take an existing disk, create a degraded raid 0 array, which doesn’t affect the data at all on the disk, and then ‘morph’ the raid 0 into a raid 1 array, with the additon of another disk.

    As I say, I am certain I have seen an existing disk being used in a new raid 1 array on another server without the data being affected.

    Can anyone advise if they succeeded at this before?

    Thanks in advance

    Taw_J

    Avatar
    Ossian
    Moderator
    #178526

    Re: Configure non-RAID disk into RAID 1 array without losing data/restoring

    It is going to come down to your RAID controller
    Most hardware based ones I have seen offer you the option to clone an existing disk as opposed to starting from scratch

    Have a good look at the manual before you do anything

    Note though, that if you move the OS drive from one controller to another, it will need the correct RAID drivers installed for it to boot

    Avatar
    sorinso
    Member
    #266757

    Re: Configure non-RAID disk into RAID 1 array without losing data/restoring

    You will need to provide much more information for me to be able to give you an exact answer…
    What type of server (exact model) is the new server? Is it HP also?
    What type of hard disk are we talking about?
    Most important: what RAID server you have in the new server?

    I managed to do things like these with HP servers, although I will need all relevant info to be sure…

    Avatar
    Taw_Jackson
    Member
    #310217

    Re: Configure non-RAID disk into RAID 1 array without losing data/restoring

    Thank you Ossian and Sorinso

    I know I should have listed the server details, apologies.

    Will post them asap.

    Thank you both for replying

    Taw

    Avatar
    Taw_Jackson
    Member
    #310218

    Re: Configure non-RAID disk into RAID 1 array without losing data/restoring

    Hi guys

    Here are the server/raid details:

    Current Server

    Dell PowerEdge 1850

    SCSI Adapter

    LSI Logic PCI-X Ultra320 SCSI Host Adapter (embedded)


    Disk

    Maxtor Atlas10K5_73SC 68.37Gb




    Target Server

    Dell PowerEdge 2850

    PERC 4e/Di Raid Controller




    Do Dell raid controllers offer the option to build an array around an existing data disk?

    Thanks

    Taw

    Avatar
    sorinso
    Member
    #266759

    Re: Configure non-RAID disk into RAID 1 array without losing data/restoring

    DOH ?!?!?
    Where’s that HP server you talked about earlier? :???:

    I am not accustomed with Dell products enough to give you an advice in this one …

    Avatar
    Taw_Jackson
    Member
    #310219

    Re: Configure non-RAID disk into RAID 1 array without losing data/restoring

    My apologies.

    With so many different servers to manage spread over various customer accounts, I wrote ‘HP DL’ instead of ‘Dell PE’.

    Taw

    Avatar
    sorinso
    Member
    #266760

    Re: Configure non-RAID disk into RAID 1 array without losing data/restoring

    Never mind …
    Just kidding…
    The issue is that HP I know pretty well, Dell not even a bit…
    So cannot help :(

    Avatar
    cruachan
    Participant
    #328933

    Re: Configure non-RAID disk into RAID 1 array without losing data/restoring

    As far as I know such things are possible using Dell’s OpenManage or ArrayManage suite. However I’ve never done it. If you are still under warranty it’s worth giving Dell a call and have one of their techs go through the procedure with you, as this gives you a degree of protection if things go wrong. Obviously make sure you have a full backup before starting as well.

    Avatar
    Taw_Jackson
    Member
    #310220

    Re: Configure non-RAID disk into RAID 1 array without losing data/restoring

    Thank you guys

    Will call Dell and see what the crack is.

    All the best

    Taw

    Avatar
    Taw_Jackson
    Member
    #310221

    Re: Configure non-RAID disk into RAID 1 array without losing data/restoring

    Update:

    I came across this document:

    http://www.cs.uwaterloo.ca/~brecht/servers/docs/PowerEdge-2600/en/Perc4scdc/UG/bios.htm

    In the document there is the following chapter:


    Using a Pre-loaded SCSI Drive “As-is”

    note.gifNOTE: To use a pre-loaded system drive in the manner described here, you must make it the first logical drive defined (for example: LD1) on the controller it is connected to. This makes the drive ID 0 LUN 0. If the drive is not a boot device, the logical drive number is not critical.

    You may have a SCSI hard drive that is already loaded with software. The drive may be a boot disk containing an operating system. If so, add the PERC device driver to this system drive before you switch to the PERC 4 and attempt to boot from it. Perform the following steps to use the PERC 4 controller as a SCSI adapter for such a drive:

    1. Connect the SCSI drive to the channel on the PERC 4 controller, with proper termination and target ID (TID) settings.
    2. Boot the computer.
    3. Start the BIOS Configuration Utility by pressing .
    4. Select

    Configure—> Easy Configuration.

  • Press the cursor keys to select the pre-loaded drive.

    [*]Press the spacebar.
    The pre-loaded drive should now become an array element.

    1. Press .

    You have now declared the pre-loaded drive as a one-disk array.

    1. Set the

    Read Policy and Cache Policy on the Advanced Menu.

  • Exit the Advanced Menu.

    [*]Highlight Accept and press .
    Do not initialize.

    1. Press and select

    Yes at the Save prompt.

  • Exit the BIOS Configuration Utility and reboot.

    [*]Set the host system to boot from SCSI, if such a setting is available.



    The intersting line is:

    1. Press .

    You have now declared the pre-loaded drive as a one-disk array.

    I wonder then, if the pre-loaded scsi disk is now configured on the perc raid controller as a ‘one-disk array’ can this one disk array be morphed into a raid 1 configuration by adding another disk?

    Anyone done this?

    Cheers

    Taw_J

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