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
________________________________
From: owner-toasters@mathworks.com [mailto:owner-toasters@mathworks.com]
On Behalf Of Daniel Keisling
Sent: vrijdag 25 januari 2008 23:15
To: toasters@mathworks.com
Subject: RE: Thin provisioning LUNs, A-SIS, and notifications
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....
________________________________
From: owner-toasters@mathworks.com [mailto:owner-toasters@mathworks.com]
On Behalf Of Daniel Keisling
Sent: Friday, January 25, 2008 12:07 PM
To: toasters@mathworks.com
Subject: Thin provisioning LUNs, A-SIS, and notifications
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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