[DRBD-user] /dev/drbd/by-res/ and /dev/drbd/by-disk not cleared

Mathieu Gagné mgagne at iweb.com
Tue Aug 31 17:07:03 CEST 2010


On 8/31/10 10:53 AM, Lars Ellenberg wrote:
> On Mon, Aug 30, 2010 at 10:58:51AM -0400, Mathieu Gagné wrote:
>> Hi,
>>
>> We are having issues with symbolic links in /dev/drbd/by-res/ and
>> /dev/drbd/by-disk not being cleared after a resource is
>> removed/unconfigured.
>>
>> The issue was claimed to be fixed with 8.3.1rc2:
>> http://lists.linbit.com/pipermail/drbd-user/2009-March/011771.html
>
> Nope, that was a different issue than yours, (symlinks have not been
> updated to new names when they should have) and it was fixed.

Ok.

>> Unfortunately, the issue is not fixed and can still be reproduced.
>>
>> We are using DRBD 8.3.7 but used the latest version of
>> scripts/drbd.rules from git.
>>
>> According to git log, this file has not changed for +15 months:
>> http://git.drbd.org/drbd-8.3.git/?p=drbd-8.3.git;a=history;f=scripts/drbd.rules;h=080635f05e63414a34ce85bb1afa11351f3d0ed9;hb=HEAD
>>
>> The issue can be reproduced with those steps:
>> 1) create a new standalone resource resname (add it to drbd.conf)
>> 2) drbdadm create-md resname
>> 3) drbdadm attach resname
>> 4) drbdadm -- -o primary resname
>> 5) drbdadm down resname
>>
>>
>> Results:
>> 1) Both symbolic links in /dev/drbd/by-res/ and /dev/drbd/by-disk
>> still exist.
>
> Expected.
> The device's state is now "unconfigured", but the device still exists.
>

I do agree that the DRBD device is now unconfigured.

However the DRBD resource itself does not exist anymore in the 
configuration, therefore:
- The disk is not associated to any DRBD device (by-disk)
- The DRBD resource does not exist anymore (by-res)

Therefore why would there still be a need for the presence of those 
symbolic links which are now a false representation of the reality?

-- 
Mathieu


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