[DRBD-user] Commands freeze when accessing drbd device.

Diego Julian Remolina diego.remolina at ibb.gatech.edu
Tue Jan 10 19:40:29 CET 2006

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.

If you want to wipe the drbd partition, just format it directly and the metadata space will be 
accounted for automatically.

Simply do:

mke2fs -j /dev/drbd0

However, if you can keep metadata in a separate partition, it would be a lot better and you will be 
able to blank your drbd partition using dd. The default meatadata size is 128MB per drbd partition, 
so make sure that you create a partition with enough space for as many drbd partitions as you will 
have.  A 1024MB partition for drbd metadata should be good for up to 8 devices.


Corey Edwards wrote:
> On Tue, 2006-01-10 at 10:17 +0100, Francis SOUYRI wrote:
>>When I try to access a drbd device, the command used freeze like that:
>>[root at noeud1 ~]# drbdsetup /dev/drbd0 primary --do-what-I-say
>>[root at noeud1 ~]# dd if=/dev/zero of=/dev/drbd0
>>dd: writing to `/dev/drbd0': No space left on device
>>262145+0 records in
>>262144+0 records out
>>**** no return ****
>>    on noeud1 {
>>        device           /dev/drbd0;
>>        disk             /dev/vgroot/lvnamed;
>>        address;
>>        meta-disk        internal;
>>    }
> Remember that with internal metadata the last 128MB of the disk are
> reserved. I've never used internal much so I can't say for sure, but
> this sounds like it could easily be caused by trying to write to that
> reserved section of the disk.
> Try mke2fs again and explicitly specify the size of the disk as 128MB
> smaller than the real size.
> Corey
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Diego Julian Remolina
System Administrator - Systems Support Specialist III
Institute for Bioengineering and Bioscience
Georgia Institute of Technology
Phone (404) 385-0127
Fax   (404) 894-2291
315 Ferst Drive
Atlanta, GA 30332-0363

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