[Bug 1028677] Re: mdadm should be used for fakeraid (instead of dmraid)
launchpad at surgut.co.uk
Wed Jul 25 22:18:47 UTC 2012
Ok. Both ubiquity and the debian-installer use a piece of software for
partitioning collectively known as partman.
Partman has many "plugins" for setting up different file systems and
Partman-md is a single package which handles mdadm based RAID.
Partman-md upstream is at:
The actual code is bash scripts and debconf templates.
What needs doing is:
1) add a detection if external metadata is supported by the underlying disks
2) add a question to offer a choice of metadata formats: e.g. internal (1.2/1.1/1.0/0.9), external (ISMS, DDF)
3) modify the partitioning to use the correct/requested metadata format.
The patch will be small and fairly straight-forward, after you
understand how all the different run-parts scripts work together with
debconf. You will find more information from
I do not have access to ISMS/DDF hard-drives, therefore I cannot
develop&test such patch.
If you develop such a patch I will be happy to review it and push it
into Debian and Ubuntu.
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mdadm should be used for fakeraid (instead of dmraid)
Status in “debian-installer” package in Ubuntu:
Status in “mdadm” package in Ubuntu:
Status in “partman-md” package in Ubuntu:
Status in “ubiquity” package in Ubuntu:
mdadm now support external metadata and can hadle fakeraid better than dmraid:
It seems that dmraid is no more developed (only maintenance), so
ubuntu should use mdadm instead of dmraid for fakeraid.
Actually, it's not possible to setup a new ubuntu install with mdadm
fakeraid (tried 12.04 and 12.10 alpha 2 alternate cd): only dmraid is
DistroRelease: Ubuntu 11.10
Package: mdadm (not installed)
ProcVersionSignature: Ubuntu 3.0.0-23.39-generic 3.0.36
Uname: Linux 3.0.0-23-generic i686
Date: Wed Jul 25 00:45:56 2012
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release i386 (20111011)
PATH=(custom, no user)
UpgradeStatus: Upgraded to oneiric on 2012-07-07 (17 days ago)
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