On Mon, Sep 05, 2005 at 06:45:30PM +0200, Molle Bestefich wrote:
Neil Brown wrote:
No.
I've never liked kernel autodetect, and while I won't break it, I
would like to migrate people away from it.
[snippet]
I hope you find that acceptable.
I won't go as far as to insinuate that I know what is acceptable and
what is not.
But I definitely like autodetection a lot.
because it never bit you :-)
I'm having troubling seeing why you'd like every MD user out there to
start fiddling with mdadm commands in their initrd when it can all be
done automatically behind the scenes.
I'm a big fan of letting computers do manual labour (especially MY
manual labour), and preferably doing it intelligently.
there is no reason for user to fiddle with md commands.
just have the command used to create initrd handle this, i have been
doing this for ages
I hope you have the time to enlighten me! :-).
What will, very likely, be implemented is something in 'mdadm' which
automatically detects and assembles md arrays.
If that implies that all that distros have to do is put 'mdadm
--auto-assemble' into initrd, and it will do the same as kernel
autodetection does, I for one would be happy happy.
it would actually work, versus autodetection which does not always.
You run
mdadm -As --config=partitions --hostid=notabene
then it scans all partitions for md arrays, looks at those with
'notabene' as the hostname in the 'name' field, and assembles them,
So if you change your hostname, you have to modify your initrd?
no, it is just a tag, it is unrelated to the gethostname() syscall.
I fail to see what the added complexity might bring of good things to the table.
you probably never had to deal with shared storage
Such a command would reliably assemble all arrays with any need for a
config file, and without any risk of getting confused if arrays are
imported from another machine (which is one of my issues with
autodetect).
Who's confused?
MD or the user?
autodetect is confused.
< big snip>
I'm curious about what the current status of layered MD device detection is!
recent mdadm in the 1.xx series work flawlessly.
in kernel auto-detection, well....
in any case autodetection does not belong in the kernel.
it is far easier to implement and maintain in userspace.
the only reason why it has not been completely removed is backwards
compatibility.
if you don't want to use an initrd use the kernel command line.
Regards,
L.
--
Luca Berra -- bluca@xxxxxxxxxx
Communication Media & Services S.r.l.
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