ZFS does not release space even after deleting application log files in a non-global zone Post: 302894432

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Operating Systems Solaris ZFS does not release space even after deleting application log files in a non-global zone Post 302894432 by RDX on Tuesday 25th of March 2014 12:36:23 PM

03-25-2014

Registered User

Thanks for responding @jlliagre and @radoulov (bouncing apache or unmounting and mounting zfs fs are last options for me)...

I usually truncate the file after making a copy, but someone before me deleted the file directly. Now, when I do du -skh /export/home/ajb it shows around 70M but df and zfs list shows about 9.7g which is 100%. I have seen this discrepancy between du and df in UFS for which I use the following solution
Sorry it wont let me post a link to the source, for the source please google for
Discrepancies Between df And du Outputs

Code:

1. Find the file which has been unlinked through the procfs interface

# find /proc/*/fd \( -type f -a ! -size 0 -a -links 0 \) -print | xargs \ls -li
 415975 --w-------   0 user  group  2125803025 Oct 15 23:59 /proc/1252/fd/3


2. Eventually, get more detail about it:

  1252

3.Check to see if you can understand what is the content of the unlinked file:
# tail /proc/1252/fd/3
-------------------------------------------------------------------------------
2008-10-15 23:59:32.002116 - [MSG] BBG_Transmitter_class.cc, line 792 (thread 25087:4)
[4060] Sent a heartbeat
-------------------------------------------------------------------------------
BBG_Transmitter_class.cc: [4111] No activity detected. Send a Heartbeat message
-------------------------------------------------------------------------------
2008-10-15 23:59:32.134829 - [MSG] BBG_Transmitter_class.cc, line 1138 (thread 25087:4)
[4065] Heartbeat acknowledged by Bloomberg

4.You can correlate the size of the removed, but always referenced, file to the space accounted from the du and df tools:
# df -k /path/to
Filesystem            kbytes    used   avail capacity  Mounted on
/dev/md/dsk/d5       6017990 5874592   83219    99%    /path/to
# du -sk /path/to
3791632 /data
# echo "(5874616-3791632)*1024" | bc
2132975616

5. So, we now found the ~2GB log file which was always opened (used) by a process. Now, there are two solutions to be able to get back the freed space:
Truncate the unlinked file (quick workaround).
Simply restart properly the corresponding program (better option).

But I don't know if that'll work for a zfs filesystem.... Do you know any procedure like the one above where I can truncate the links which are holding up the space?

RDX

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heartbeat

HEARTBEAT(8)						  System administration utilitie					      HEARTBEAT(8)

NAME

       heartbeat - Heartbeat subsystem for High-Availability Linux

DESCRIPTION

       heartbeat is a basic heartbeat subsystem for Linux-HA. It will run scripts at initialisation, and when machines go up or down. This version
       will also perform IP address takeover using gratuitous ARPs. It works correctly for a 2-node configuration, and is extensible to larger
       configurations.

       It implements the following kinds of heartbeats:

       o   UDP/IP broadcast;

       o   UDP/IP multicast;

       o   UDP/IP unicast;

       o   Bidirectional Serial Rings ("raw" serial ports) -- this type is deprecated and should no longer be used;

       o   special "ping" heartbeats for routers, etc. -- this type has been superseded by functionality in pacemaker() and should no longer be
	   used.

       Comprehensive documentation on heartbeat is available in the Heartbeat User's Guide. If this documentation is not installed on your system,
       it can be found at http://linux-ha.org/.

OPTIONS

       The following options are supported by heartbeat:

       -d
	   Increment debugging level. Higher levels are more verbose.

       -r
	   Reload heartbeat. This option is functionally identical to sending a running heartbeat process a HUP signal. If the configuration has
	   not changed, then this option is essentially a no-op. If ha.cf(5) or authkeys(5) has changed, then heartbeat will re-read these files
	   and update its configuration.

	   This option may not be used together with -R.

       -k
	   Kill (stop) heartbeat.

       -s
	   Report heartbeat status.

       -R
	   Heartbeat restart exec flag (internal use only). May not be used with -r.

       -C
	   Heartbeat current resource state for restart (internal use only). Only valid with -R.

       -V
	   Print out heartbeat version.

       Note that most of these options are used for supporting the heartbeat init script, which provides the conventional start, stop, status and
       restart options (among others). It is recommended to use this rather than invoking the heartbeat command directly.

SEE ALSO

       ha.cf(5), authkeys(5)

AUTHORS

       Alan Robertson <alanr@unix.sh>
	   heartbeat

       Juan Pedro Paredes Caballero <juampe@retemail.es>
	   man page

       Simon Horman <horms@verge.net.au>
	   man page

       Florian Haas <florian.haas@linbit.com>
	   man page

Heartbeat 3.0.5 						    24 Nov 2009 						      HEARTBEAT(8)