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From Storage Navigator/CLI/or ? how to view LUN space utilization details (how much space is being utilized on a LUN)

Posted on 2008-10-29
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Last Modified: 2013-11-14
I use storage navigator to administer the AMS1000 SAN and wanted to know how to get LUN space utilization statistics from the SAN side to see how much space is being utilized on each LUN.  How would I accomplish this without having to look at the hosts.
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Question by:zarcow
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VXDguy earned 250 total points
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The closest you can get to seing LUN space utilization would be to use something like Dynamic Provision which would show how much of the LUN space has been written to by the OS.

Dynamic Provisioning is like VMWare virtual disk container files.  They start out zero bytes long and grow up to a preset max size as the OS is using the space.  DP does the same and pull the space from a disk pool, and yes, you can allocate more space than you really have.

Also this feature is *NOT* available on a HDS AMS 1000.  You can get Dynamic Provisioning as an option on the enterprise arrays (USPV and USPVM).  That said, I'm still not sure there's a HiCommand (v6.0.2) API to look at LUN size utilization for a DP LUN.

Even with DP based LUN allocation, the space report will be inaccurate.  If you write a 12GB file to the hard drive, then delete it, the filesystem shows +12GB space.  The DP LUN shows -12GB space because once you touch a track, it's allocated to the server for good.  Doesn't matter if you erase it, that's a logical filesystem operation, you can't "give back" the track and put it into the pool.

So without DP available on your disk array, the only way to see LUN space utilization would be to ask the host.  Of course, you could covert your AMS1000 to a NAS server
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