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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df

df(1B)						     SunOS/BSD Compatibility Package Commands						    df(1B)

NAME

       df - display status of disk space on file systems

SYNOPSIS

       /usr/ucb/df [-a] [-i] [-t type] [filesystem...]
	    [filename...]

DESCRIPTION

       The  df	utility  displays the amount of disk space occupied by currently mounted file systems, the amount of used and available space, and
       how much of the file system's total capacity has been used.

       If arguments to df are path names, df produces a report on the file system containing the named file. Thus `df	.'  shows  the	amount	of
       space on the file system containing the current directory.

OPTIONS

       The following options are supported:

       -a	  Report on all filesystems including the uninteresting ones which have zero total blocks (that is, auto-mounter).

       -i	  Report the number of used and free inodes. Print ` * ' if no information is available.

       -t type	  Report on filesystems of a given type (for example, nfs or ufs).

EXAMPLES

       Example 1 Using df

       A sample of output for df looks like:

	 example% df
	 Filesystem   kbytes  used  avail  capacity  Mounted on
	 sparky:/	7445  4714  1986     70%     /
	 sparky:/usr   42277 35291  2758     93%     /usr

       Note  that  used+avail  is less than the amount of space in the file system (kbytes); this is because the system reserves a fraction of the
       space in the file system to allow its file system allocation routines to work well. The amount reserved is typically about 10%; this can be
       adjusted  using	tunefs	(see  tunefs(1M)).  When all the space on a file system except for this reserve is in use, only the super-user can
       allocate new files and data blocks to existing files. When a file system is overallocated in this way, df can report that the  file  system
       is more than 100% utilized.

FILES

       /etc/mnttab    List of file systems currently mounted

       /etc/vfstab    List of default parameters for each file system

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWscpu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       du(1), quot(1M), tunefs(1M), mnttab(4), attributes(5)

SunOS 5.11							    14 Sep 1992 							    df(1B)