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....
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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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