access array from knoppix

access array from knoppix

[Dexter Filmore]

When running Knoppix on my file server, I can't mount /dev/md0 simply because 
it isn't there. 
Am I guessing right that I need to recreate the array?
How do I gather the necessary parameters?

-- 
-----BEGIN GEEK CODE BLOCK-----
Version: 3.12
GCS d--(+)@ s-:+ a- C++++ UL++ P+>++ L+++>++++ E-- W++ N o? K-
w--(---) !O M+ V- PS+ PE Y++ PGP t++(---)@ 5 X+(++) R+(++) tv--(+)@ 
b++(+++) DI+++ D- G++ e* h>++ r* y?
------END GEEK CODE BLOCK------

http://www.stop1984.com
http://www.againsttcpa.com

Re: access array from knoppix

[Justin Piszcz]

fdisk -l

then you have to assemble the array

mdadm --assemble /dev/md0 /dev/hda1 /dev/hdb1 # i think, man mdadm

On Tue, 12 Sep 2006, Dexter Filmore wrote:

> When running Knoppix on my file server, I can't mount /dev/md0 simply because
> it isn't there.
> Am I guessing right that I need to recreate the array?
> How do I gather the necessary parameters?
>
> -- 
> -----BEGIN GEEK CODE BLOCK-----
> Version: 3.12
> GCS d--(+)@ s-:+ a- C++++ UL++ P+>++ L+++>++++ E-- W++ N o? K-
> w--(---) !O M+ V- PS+ PE Y++ PGP t++(---)@ 5 X+(++) R+(++) tv--(+)@
> b++(+++) DI+++ D- G++ e* h>++ r* y?
> ------END GEEK CODE BLOCK------
>
> http://www.stop1984.com
> http://www.againsttcpa.com
> -
> To unsubscribe from this list: send the line "unsubscribe linux-raid" in
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Re: access *exisiting* array from knoppix

[Dexter Filmore]

Am Dienstag, 12. September 2006 15:29 schrieb Justin Piszcz:
> fdisk -l
>
> then you have to assemble the array
>
> mdadm --assemble /dev/md0 /dev/hda1 /dev/hdb1 # i think, man mdadm

Not what I meant: there already exists an array on a file server that was 
created from the server os, I want to boot that server from knoppix instead 
and access the array.

-- 
-----BEGIN GEEK CODE BLOCK-----
Version: 3.12
GCS d--(+)@ s-:+ a- C++++ UL++ P+>++ L+++>++++ E-- W++ N o? K-
w--(---) !O M+ V- PS+ PE Y++ PGP t++(---)@ 5 X+(++) R+(++) tv--(+)@ 
b++(+++) DI+++ D- G++ e* h>++ r* y?
------END GEEK CODE BLOCK------

http://www.stop1984.com
http://www.againsttcpa.com

Re: access *existing* array from knoppix

[Dexter Filmore]

Am Dienstag, 12. September 2006 16:08 schrieb Justin Piszcz:
> /dev/MAKEDEV /dev/md0
>
> also make sure the SW raid modules etc are loaded if necessary.

Won't work, MAKEDEV doesn't know how to create [/dev/]md0.


-- 
-----BEGIN GEEK CODE BLOCK-----
Version: 3.12
GCS d--(+)@ s-:+ a- C++++ UL++ P+>++ L+++>++++ E-- W++ N o? K-
w--(---) !O M+ V- PS+ PE Y++ PGP t++(---)@ 5 X+(++) R+(++) tv--(+)@ 
b++(+++) DI+++ D- G++ e* h>++ r* y?
------END GEEK CODE BLOCK------

http://www.stop1984.com
http://www.againsttcpa.com

Re: access *existing* array from knoppix

[Justin Piszcz]

Strange, what knoppix are you using? I recall doing it to fix an XFS bug 
with 4.x and 5.x.

On Tue, 12 Sep 2006, Dexter Filmore wrote:

> Am Dienstag, 12. September 2006 16:08 schrieb Justin Piszcz:
>> /dev/MAKEDEV /dev/md0
>>
>> also make sure the SW raid modules etc are loaded if necessary.
>
> Won't work, MAKEDEV doesn't know how to create [/dev/]md0.
>
>
> -- 
> -----BEGIN GEEK CODE BLOCK-----
> Version: 3.12
> GCS d--(+)@ s-:+ a- C++++ UL++ P+>++ L+++>++++ E-- W++ N o? K-
> w--(---) !O M+ V- PS+ PE Y++ PGP t++(---)@ 5 X+(++) R+(++) tv--(+)@
> b++(+++) DI+++ D- G++ e* h>++ r* y?
> ------END GEEK CODE BLOCK------
>
> http://www.stop1984.com
> http://www.againsttcpa.com
>

Re: access *existing* array from knoppix

[Dexter Filmore]

Am Dienstag, 12. September 2006 17:47 schrieb Justin Piszcz:
> Strange, what knoppix are you using? I recall doing it to fix an XFS bug
> with 4.x and 5.x.

5.0.1. Maybe they gone udev now and didn't handle md devices.
I'll see if I can so something in /lib/udev/devices.

>
> On Tue, 12 Sep 2006, Dexter Filmore wrote:
> > Am Dienstag, 12. September 2006 16:08 schrieb Justin Piszcz:
> >> /dev/MAKEDEV /dev/md0
> >>
> >> also make sure the SW raid modules etc are loaded if necessary.
> >
> > Won't work, MAKEDEV doesn't know how to create [/dev/]md0.
> >
> >
> > --
> > -----BEGIN GEEK CODE BLOCK-----
> > Version: 3.12
> > GCS d--(+)@ s-:+ a- C++++ UL++ P+>++ L+++>++++ E-- W++ N o? K-
> > w--(---) !O M+ V- PS+ PE Y++ PGP t++(---)@ 5 X+(++) R+(++) tv--(+)@
> > b++(+++) DI+++ D- G++ e* h>++ r* y?
> > ------END GEEK CODE BLOCK------
> >
> > http://www.stop1984.com
> > http://www.againsttcpa.com

-- 
-----BEGIN GEEK CODE BLOCK-----
Version: 3.12
GCS d--(+)@ s-:+ a- C++++ UL++ P+>++ L+++>++++ E-- W++ N o? K-
w--(---) !O M+ V- PS+ PE Y++ PGP t++(---)@ 5 X+(++) R+(++) tv--(+)@ 
b++(+++) DI+++ D- G++ e* h>++ r* y?
------END GEEK CODE BLOCK------

http://www.stop1984.com
http://www.againsttcpa.com

Re: access *existing* array from knoppix

[Henrik Holst]

Dexter Filmore wrote:
> Am Dienstag, 12. September 2006 17:47 schrieb Justin Piszcz:
>> Strange, what knoppix are you using? I recall doing it to fix an XFS bug
>> with 4.x and 5.x.
> 
> 5.0.1. Maybe they gone udev now and didn't handle md devices.
> I'll see if I can so something in /lib/udev/devices.

Try this:

mdadm -Av /dev/md0 --auto=yes /dev/hda1 /dev/hdb1
                   ^^^^^^^^^^

I have used this with success on many Udev systems. It will create
/dev/md0 automatic.

Henrik Holst

Re: access *existing* array from knoppix

[dean gaudet]

On Tue, 12 Sep 2006, Dexter Filmore wrote:

> Am Dienstag, 12. September 2006 16:08 schrieb Justin Piszcz:
> > /dev/MAKEDEV /dev/md0
> >
> > also make sure the SW raid modules etc are loaded if necessary.
> 
> Won't work, MAKEDEV doesn't know how to create [/dev/]md0.

echo 'DEVICE partitions' >/tmp/mdadm.conf
mdadm --detail --scan --config=/tmp/mdadm.conf >>/tmp/mdadm.conf

take a look in /tmp/mdadm.conf ... your root array should be listed.

mdadm --assemble --config=/tmp/mdadm.conf --auto=yes /dev/md0

-dean

Re: access *existing* array from knoppix

[Rob Bray]

> Am Dienstag, 12. September 2006 16:08 schrieb Justin Piszcz:
>> /dev/MAKEDEV /dev/md0
>>
>> also make sure the SW raid modules etc are loaded if necessary.
>
> Won't work, MAKEDEV doesn't know how to create [/dev/]md0.

mknod /dev/md0 b 9 0
perhaps?

Re: access *existing* array from knoppix

[Dexter Filmore]

Am Mittwoch, 13. September 2006 15:48 schrieb Rob Bray:
> > Am Dienstag, 12. September 2006 16:08 schrieb Justin Piszcz:
> >> /dev/MAKEDEV /dev/md0
> >>
> >> also make sure the SW raid modules etc are loaded if necessary.
> >
> > Won't work, MAKEDEV doesn't know how to create [/dev/]md0.
>
> mknod /dev/md0 b 9 0
> perhaps?

Uh huh, go and try. Next boot it's gone again.
running that command in /lib/udev/devices however made it permanent. 

Took way too long to figure tho. If the kernel devs feel like they need to 
hurl over a working system they better release proper docs for the 
replacement. And stop screwing with the syntax.
(Yes, wrong list, I know...)


-- 
-----BEGIN GEEK CODE BLOCK-----
Version: 3.12
GCS d--(+)@ s-:+ a- C++++ UL++ P+>++ L+++>++++ E-- W++ N o? K-
w--(---) !O M+ V- PS+ PE Y++ PGP t++(---)@ 5 X+(++) R+(++) tv--(+)@ 
b++(+++) DI+++ D- G++ e* h>++ r* y?
------END GEEK CODE BLOCK------

http://www.stop1984.com
http://www.againsttcpa.com

Re: access *exisiting* array from knoppix

[Tuomas Leikola]

> > mdadm --assemble /dev/md0 /dev/hda1 /dev/hdb1 # i think, man mdadm
>
> Not what I meant: there already exists an array on a file server that was
> created from the server os, I want to boot that server from knoppix instead
> and access the array.
>

exactly what --assemble does. looks at disks, finds raid components,
assembles an array out of them (meaning, tells the kernel where to
find the pieces) and starts it.

no? did you try? read the manual?

Re: access *exisiting* array from knoppix

[Dexter Filmore]

Am Donnerstag, 14. September 2006 17:58 schrieb Tuomas Leikola:
> > > mdadm --assemble /dev/md0 /dev/hda1 /dev/hdb1 # i think, man mdadm
> >
> > Not what I meant: there already exists an array on a file server that was
> > created from the server os, I want to boot that server from knoppix
> > instead and access the array.
>
> exactly what --assemble does. looks at disks, finds raid components,
> assembles an array out of them (meaning, tells the kernel where to
> find the pieces) and starts it.
>
> no? did you try? read the manual?

How about you read the rest of the thread, wisecracker?


-- 
-----BEGIN GEEK CODE BLOCK-----
Version: 3.12
GCS d--(+)@ s-:+ a- C++++ UL++ P+>++ L+++>++++ E-- W++ N o? K-
w--(---) !O M+ V- PS+ PE Y++ PGP t++(---)@ 5 X+(++) R+(++) tv--(+)@ 
b++(+++) DI+++ D- G++ e* h>++ r* y?
------END GEEK CODE BLOCK------

http://www.stop1984.com
http://www.againsttcpa.com

Re: access array from knoppix

[Steve Cousins]

Dexter Filmore wrote:

> When running Knoppix on my file server, I can't mount /dev/md0 simply because 
> it isn't there. 
> Am I guessing right that I need to recreate the array?
> How do I gather the necessary parameters?

 From the man page:

	mdadm -Ac partitions -m 0 /dev/md0

This will "assemble" the array, as opposed to "create".  It says to look 
in /proc/partitions for viable partitions and then assemble the array 
with devices that have a superblock minor number of 0.  Once done, 
/dev/md0 will exist.  Tuomas was not being a "wisecracker".  His advice 
was valid.

Steve

Re: access *exisiting* array from knoppix

[Tuomas Leikola]

On 9/14/06, Dexter Filmore <Dexter.Filmore@gmx.de> wrote:
> How about you read the rest of the thread, wisecracker?

sorry. <mailreader-excuse/>

Re: access array from knoppix

[Dexter Filmore]

> His advice 
> was valid.

Maybe valid but not helping with my problem since the problem is/was, 
that /dev/md0 didn't exist at all. mdadm -C won't create device nodes.

But I figured the workaround meanwhile, so it doesn't matter anymore.
(In case someone wanna know: mknod in /lib/udev/devices does it on a hard disk 
install, I guess could work in /dev on knoppix, too, haven't tried yet.)


-- 
-----BEGIN GEEK CODE BLOCK-----
Version: 3.12
GCS d--(+)@ s-:+ a- C++++ UL++ P+>++ L+++>++++ E-- W++ N o? K-
w--(---) !O M+ V- PS+ PE Y++ PGP t++(---)@ 5 X+(++) R+(++) tv--(+)@ 
b++(+++) DI+++ D- G++ e* h>++ r* y?
------END GEEK CODE BLOCK------

http://www.stop1984.com
http://www.againsttcpa.com

Re: access array from knoppix

[Rob Bray]

> Maybe valid but not helping with my problem since the problem is/was,
> that /dev/md0 didn't exist at all. mdadm -C won't create device nodes.
>
> But I figured the workaround meanwhile, so it doesn't matter anymore.
> (In case someone wanna know: mknod in /lib/udev/devices does it on a hard
> disk
> install, I guess could work in /dev on knoppix, too, haven't tried yet.)
>
>
Do you want to be able to boot using knoppix all the time, or are you
looking for a oneshot solution? I feel like 'mknod' with major 9 is a
trivial thing to have to do.