Re: disk/by-label + label-change

["T. Horsnell" <tsh@mrc-lmb.cam.ac.uk>]

>On 12/12/06, T. Horsnell <tsh@mrc-lmb.cam.ac.uk> wrote:
>> If a disk with a persistence-entry in /dev/disk/by-label
>> is re-labelled with tune2fs, the by-label entry isnt
>> updated to match the new label and when the disk is mounted
>> with a 'mount -L ',
>
>You are writing to a raw sector of the disk, no part of the system
>will notice that you did this and have changed something. You need to
>tell the kernel to emit an event by doing:
>  echo "add" > /sys/block/sda/uevent
>and the link will get updated.

OK, thanks. But shouldnt tune2fs do this when it updates the label?
I guess I should make my own tune2fs script and do it there.

>
>> the mounted-device shows up as something
>> like:
>>
>> [root@dev1 ~]# mount
>> /dev/hdb2 on / type ext3 (rw)
>> proc on /proc type proc (rw)
>> sysfs on /sys type sysfs (rw)
>> devpts on /dev/pts type devpts (rw,gid=5,modeb0)
>> tmpfs on /dev/shm type tmpfs (rw)
>> none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
>> sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
>> >>>> /dev/.tmp-8-17 on /test type ext3 (rw)
>>
>> Is this as it should be?
>
>Looks like you mounted the device with a PROGRAM rule, right? This is
>definitely not what it "should be". :)

I do no mounting in udev, its all in fstab. I never thought to
do it in a udev PROGRAM rule...

I'm experimenting with stuff at the moment, prior to setting up
a set of rules for my production box. I currently use things like

echo "scsi add-single-device BUSNO 0 UNITNO 0" > /proc/scsi/scsi
echo "scsi remove-single-device BUSNO 0 UNITNO 0" > /proc/scsi/scsi

in conjunction with a site-specific rules file to play with individual
scsi disks on a running system.

I mounted it with:

mount -L whatever /test

Cheers,
Terry


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