This is idd normal behaviour. When blocks are getting
filled up in your lun, Netapp will also notice that and the used space will
grow. When however your file system frees blocks, this is not told to Netapp, so
those blocks will be kept in use even when there is no data in it anymore.
Netapp simply doesn't know they are freed.
In Windows you can use Snapdrive 5 with a new feature
called 'Space reclamation". In this case Snapdrive will scan your NTFS
filesystem regularily and will tell Netapp which blocks can be freed. In this
case your used space will also decrease on Netapp when you free up space in your
lun.
Grtz,
Tom
After a couple of replies, I have determined that the
volume never decreasing is indeed normal behavior. I started SIS on the
volume and the LUN did decrease, with great results.
Now if I can just configure SNMP notification for
volume autosize events....
Hello,
I am starting to
thin provision LUNs (lun set reservation disable) in order to start using
A-SIS on some large (1TB)
volumes. Before I turn A-SIS on, I
started testing these LUNs and do see the space on the filer grow accordingly
with writes on the host. However, the space never seems to go down when I
delete files on the host:
rtpstore2b> df
/vol/iscsi
Filesystem
kbytes used
avail capacity Mounted on
/vol/iscsi/
10485760 9974748
511012 95% /vol/iscsi/
/vol/iscsi/.snapshot
0
0
0 ---% /vol/iscsi/.snapshot
[root@vrhel5 /]# df
/mnt/iscsi
Filesystem
1K-blocks Used Available Use% Mounted
on
/dev/sde1
10321192 7804844 1992064 80%
/mnt/iscsi
I see that when I
begin writing again, the filer space won't
start increasing until there is an increase in space above what the filter
already thinks. Is this behavior normal? When I turn SIS on, will
the filer LUN size reduce as blocks are deduplicated so that I can
then reduce the volume?
Lastly, I will
definitely need to know when my volumes autosize so I can focus my attention on
not having the aggregate fill up. It would be wonderful if I could set up
an SNMP trap to send to Nagios for notification. Before I dig into the
MIBs and create the custom trap (if I even
can), has anyone done anything similar they could share?
TIA,
Daniel
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