how to start a md device?

dreams · 02-09-2006, 01:26 AM

hello everyone
my md0 is a raid1 device, and i stop it ,

Code:

mdadm --stop /dev/md0

but i want to start it now , how can i do that?

Code:

mdadm --run /dev/md0 
mdadm : failed to run array /dev/md0: Invalid argument

thank u so much

dreams · 02-09-2006, 08:39 AM

anyone can help me ?
i am so appreciated.

dreams · 02-11-2006, 08:23 AM

anyone ...

uselpa · 02-11-2006, 08:51 AM

`man mdadm` says:

Quote:

mdadm --assemble --scan
This will assemble and start all arrays listed in the standard confile file. This command will typi-
cally go in a system startup file.

dreams · 02-13-2006, 04:27 AM

thank uselpa,
but i haven't any mdadm config file,
/etc/mdadm/mdadm.conf? I haven't it

how can i create it ?

i am a non-englishspeaker, so my english is so poor, can't understand whole things of mdadm's manpage

dreams · 02-13-2006, 09:31 PM

thanks uselpa
i issue this:

Code:

mdadm --assemble /dev/md0 /dev/hda2 /dev/hdb2

start md0 again, thanks, but i issue this, it prompt me:

Code:

mdadm --assemble --scan
mdadm: No array found in config file

btw, how can i create or generate this file?

Code:

/etc/mdadm/mdadm.conf.

thank u so much everyone

uselpa · 02-14-2006, 01:15 AM

Please have a look at http://www.linuxdevcenter.com/pub/a/...2/05/RAID.html, maybe that can help.

dreams · 02-14-2006, 02:56 AM

thank u so much , uselpa
im so appreciated

Clemente · 02-14-2006, 03:18 AM

Just an addendum:
If you compile all the md related eatures into your kernel (ide drivers, sata drivers if needed, md support etc), the kernel can do autodetection for any raid devices at boot time.
So you don't have to care for raidtools or mdadm any more.
I think, that the initrd should help in case you prefer modules - but no experience here.
Clemente

guysoft · 02-14-2006, 07:03 AM

Quote:

Originally Posted by Clemente

Just an addendum:
If you compile all the md related eatures into your kernel (ide drivers, sata drivers if needed, md support etc), the kernel can do auto-detection for any raid devices at boot time.
So you don't have to care for raid tools or mdadm any more.
I think, that the initrd should help in case you prefer modules - but no experience here.
Clemente

i think life is easier with inird (when it has the right modules).

i have RAID-1 on my PC at home, it boots like this,

the grub configurations is as so (located at /boot/grub/menu.lst):

Code:

title MEPIS at hda2 RAID, kernel 2.6.14-686
root (hd2,0)
kernel /boot/vmlinuz-2.6.14-2-686 root=/dev/md0 md=0,/dev/hda2,/dev/hdc1 nomce quiet splash=verbose vga=791
initrd /boot/initrd.img-2.6.14-2-686
savedefault

while the initrd image is created with mkinitramfs and not mkinitrd (otherwise you don't have the right modules). this should work with any kernel later than 2.6.12

dreams · 02-14-2006, 07:24 PM

thanks all