RE: Dynamically increase/reduce hardware raid partition?

From: Alvin Oga (aoga_at_ns.Linux-Consulting.com)
Date: 04/14/04

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    Date: Tue, 13 Apr 2004 23:03:16 -0700 (PDT)
To: Michael Bellears <MBellears@staff.datafx.com.au>

    hi ya michael

    On Wed, 14 Apr 2004, Michael Bellears wrote:
    > > On Wed, 14 Apr 2004, Michael Bellears wrote:
    ....
    > > when you formatted the disks... did you use -m 1 or some
    > > other non-default "reserved space" on these giant disks
    >
    > No - Standard install with cfdisk (So whatever it uses)

    the "-m 1" is for things like mke2fs(fs formatting) not for
    cfdisk(low level partitions)
     
    > > > If I add an additional 146.8G drive, and update the
    > > array(Raid BIOS),
    > >
    > > if you changed the "partition" ( raid bios )... you lost all data
    > > - partitions are not dynamically resizable to add new disks
    > > to the array
    >
    > I added the addiditional HD to the dynamic array (HP top tools) - Giving
    > a total of ~520G (As reported in HP Tool)

    in order for you to be able to add a new disk to expand/grow
    your hardware raid, 3 things must work
            - your hw raid controller tools needs to support
            dynamically growing the raid array

            - your partition tools must be able to grow partition
            across multiple disls
                    ( some partition tools allow you to dynamically resize
                    ( partitions on the same disk, 256MB root fs to 512MB

            - your filesystem must be able to grow across disks

    i'd expect all 3 requirement for adding a 5th disk to an existing
    4-disk radi5 setup to fail

    - you can make a new raid array of 4 more disks ...

    - you can replace a dead disk with a fresh new one

    - i doubt you can grow an existing array
            - but its late .. maybe i'm missing something

    c ya
    alvin 

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