Hi,
I notice on my system that the hard drives "device names" can change.
Ie .
The hard drives are connected to the motherboard SATA connectors or to PCI
SATA cards. They get different "names" /dev/sda or /dev/sdc depending how
many of the cards are "active".
For instance the hard drives on the motherboard itself are called /dev/sde
and /dev/sdf if there are hard drives on the 2 PCI cards and are
called /dev/sda and /dev/sdb if there are none.
This is disconcerting, as I am setting up a remote site that I want to be able
to visit rarely. I want to leave the "extra" hard drives on the PCI cards
"off" for a few months, and am worried of FUD (fear uncertainty and doubt)
when I zoom in - to adjust the system - in a few months time when I come to
connect the additional drives.
(Note: I am completely confused by udev which makes my raid life difficult -
and I completely removed it so I am working with a static /dev/
directory :) )
I notice that there is a -u option based on the fixed uuid
mdadm -A /dev/md0 -u ?????
now I read in the man page:
If precisely one device is listed, but --scan is not given, then mdadm
acts as though --scan was given and identify information is extracted
from the configuration file.
The identity can be given with the --uuid option, with the --super-
minor option, can be found in the config file, or will be taken from
the super block on the first component-device listed on the command
line.
Now I am confused: unfortunately this does not seem to help me:
if it relys on the configuration file /etc/mdadm/mdadm.conf
this config file - i create with the aid of mdadm --detail --scan
seems to still have the (problematic) "variable" device names in it.
I want only to use the uuid and not the "device name" which may change.
How can I deal effectively with my problem?
I want to set up my assemble line in my startup script so that all I need to
do is
1) connect the additional hard drives and
2) uncomment a line in a startup script that will refer to the new hard drives
only by their uuid so that I can be assured that the new device /dev/md1 will
be the new drives and not a switcheroo?
Thanks!
Mitchell
-
To unsubscribe from this list: send the line "unsubscribe linux-raid" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
