filesystem size is not updating while doing bdf

[Mike Abasolo]

Im experiencing a weird scenario. Filesystem is currently empty but my bdf shows a different ouput.

[root@server1:/root]
# bdf /oracle/F7C/sapdata3
Filesystem kbytes used avail %used Mounted on
/dev/vg_F7C_03/lv_data03
35586048 23145840 12343096 65% /oracle/F7C/sapdata3


[root@server1:/root]
# du -sk /oracle/F7C/sapdata3
8 /oracle/F7C/sapdata3

[root@server1:/root]
# lvdisplay /dev/vg_F7C_03/lv_data03
--- Logical volumes ---
LV Name /dev/vg_F7C_03/lv_data03
VG Name /dev/vg_F7C_03
LV Permission read/write
LV Status available/syncd
Mirror copies 0
Consistency Recovery MWC
Schedule parallel
LV Size (Mbytes) 34752
Current LE 8688
Allocated PE 8688
Stripes 0
Stripe Size (Kbytes) 0
Bad block on
Allocation strict
IO Timeout (Seconds) default


Hope someone could explain what happened


Thanks,
Mike

[Tim Nelson · Accepted solution]

Most likely a process still has a file open in memory. Until you find/kill that process the space will not return.

If you attempt to unmount the filesystem I would suspect you cannot because it is still busy.

run fuser or lsof to find the process.

[James R. Ferguson]

Hi Mike:

This is perfectly understandable if the file in question is a sparse one. "Sparse" files are those with unallocated extents, very common in databases. Try this:

# cd /path
# perl -le '$f="sparse";open(FH,">",$f);seek(FH,2**32,1);print FH "."'
# ls -l sparse
-rw-r--r-- 1 root sys 4294967298 Aug 29 14:53 sparse
# du sparse
16 sparse

Now, if you have the space in the filesystem where you created this file:

# cp sparse sparse.expanded

You can compare the 'bdf' output before and afterwards to see what you have observed, too.

Regards!

...JRF...

[James R. Ferguson]

Hi (again) Mike:

My apologies, I should learn to read :-(

Tim has answered your question most correctly.

Regards!

...JRF...

[Mike Abasolo]

Thanks Tim and James for that quick response. Indeed, Tim was right. There was open processes that's using the filesystem earlier. There was a backup processes accessing the filesystem. I waited for the backup to finished and found the normal utilization for the FS.

Points were assigned. Thanks :)


Regards, Mike

[Mike Abasolo]

Thread can be closed

[SKR_1]

Reboot can help you out also.

Thanks

SKR