[DRBD-user] Huge difference in useable disk space between two nodes

Lars Ellenberg lars.ellenberg at linbit.com
Thu Feb 7 14:59:38 CET 2013

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


On Thu, Feb 07, 2013 at 05:08:54AM +0000, Tobias.Heinemann at swisscom.com wrote:
> Hello,
> 
> We've recently noticed that one of our file system is runnig out of free space :
> df -k
> Filesystem           1K-blocks      Used Available Use% Mounted on
> /dev/drbd1            61925464  54821544   3958292  94% /xxx
> 
> Having a look with 'du' shows, that only 35GB are used.
> When I mounted that file system on the secondary node, all values are okay:
> /dev/drbd1            61925464  34424544  24355292  59% /xxx
> 
> What ist he reason for the difference of 20GB? (Activity log or other meta data?) And what can I do now to get free space back?

Nothing to do with DRBD.

You likely have some deleted, but still open, (log? tmp?) files.

This may give a hint:
lsof -n | grep -Ee '\<DEL\>|deleted.$'

Or maybe you have subtrees masked by submounts,
so you should check for that as well.


-- 
: Lars Ellenberg
: LINBIT | Your Way to High Availability
: DRBD/HA support and consulting http://www.linbit.com

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