[arch-projects] [INITSCRIPTS][PATCH 2/2] Disable Soft Raid (mdadm) detection in initscipts.

[Dave Reisner]

On Sun, Apr 03, 2011 at 05:39:57PM +0200, Seblu wrote:
> On Sun, Apr 3, 2011 at 5:04 PM, Dave Reisner <d at falconindy.com> wrote:
> > On Sun, Apr 03, 2011 at 04:55:14PM +0200, Sebastien Luttringer wrote:
> >> This job is done by recent version of udev in /lib/udev/rules.d/64-md-raid.rules.
> >
> > this comes from mdadm, not udev.
> Yes but upstream rules does not match with my current content. I'm
> searching why.
> 
> > It's also only triggered if the
> > partitions are of type linux_raid_member or isw_raid_member.
> partition not strictly. My raid is directly on disk (so without
> partition type from mbr) and detection is correct. Even after removing
> /etc/blkid*
> udev rules detect by /sbin/blkid -o udev -p $dev. As far i test, blkid
> is based on metadata.

blkid reads the same metadata that udev does. I misread the rule --
ID_FS_TYPE is a layer above the partition table itself. Thinking back, I
recall hearing about this on systemd-devel...

> 
> > If this
> > were to go through, we'd have a lot of people banging on our doors, so to
> > speak..
> I don't see why. Udev, via blikid will detect and assemble.
> 
> About isw_raid, line is not in mdadm package upstream 3.1.2 and 3.1.5.

It's in testing (3.2.1):

ENV{ID_FS_TYPE}=="isw_raid_member", ACTION=="remove", RUN+="/sbin/mdadm
-If $name --path $env{ID_PATH}"
ENV{ID_FS_TYPE}=="isw_raid_member", ACTION=="add", RUN+="/sbin/mdadm
--incremental $env{DEVNAME}"

> 
> Currently all people should come to us because they have an error when
> mdadm is automatically started at boot. cf bugreport closed by adding
> USE_MDADM.
> it does not seem to be the revolution :)
> 

Indeed, that error's been there as long as I've been using Arch.

dave