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List:       ubuntu-devel
Subject:    Dmraid: Call for testing.
From:       themuso () ubuntu ! com (Luke Yelavich)
Date:       2008-08-29 8:15:43
Message-ID: 20080829081543.GA11737 () brainz ! yelavich ! home
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Greetings all,
As of today's daily alternate CDs, dmraid is now available for testing. Dmraid is \
software that makes Bios/Fake RAID configurations available to Linux through the \
kernel device mapper. This type of RAID is software RAID in another form, where you \
use the disk controller's BIOS to configure the raid settings, then the OS driver, \
usually Windows or Linux, then reads metadata from the disks in the RAID set, and \
constructs the array.

There are some known issues which you don't need to report, which are as follows:
* Installing using LVM on a dmraid array does not work properly. While it appears to \
install ok, filesystems are incorrectly mounted/LVM incorrectly detects the correct \
device to use. I have only tried this with a RAID1 configuration, but it may also be \
                a problem with other RAID sets.
* If you install Ubuntu alongside Windows, the installer will not ask you whether \
your clock should be in UTC etc which indicates that Windows is present, but \
grub-installer does not configure grub to allow you to boot windows.

Note also that I have only tested dmraid so far with RAID0, and RAID1. I would \
appreciate any feedback from users using RAID10/RAID0+1, and RAID5 configurations. \
Please also note that when dmraid loads, it is via udev, and a wrapper script which I \
have written, to attempt to detect whether an array is fully functional. This script \
will not bring up arrays that are degraded unless specifically told to do so.

For those who don't have any hardware that supports this, but are able to run a KVM \
virtual machine, you can fetch a set of qcow2 format disk images from the below URL \
and try this in a virtual machine yourself:

http://www.themuso.id.au/ubuntu/dmraid-empty-disks.tar.bz2

When full, these disks take up 80GB of disk space.

Bug reports should be filed against the dmraid package in Launchpad.

Thanks

Luke
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