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February 2004, Week 3

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Subject:
Re: VA7110 LUN usage
From:
Denys Beauchemin <[log in to unmask]>
Reply To:
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Date:
Mon, 16 Feb 2004 23:08:33 -0600
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IIRC, the CommandView SCM will show the space as it is allocated for
each LUN.  When you create a LUN, the space is not initialized.  It just
marked that it can go up to a specific amount.  As you use the space, it
is initialized for that LUN and marked for it.  Even if you delete the
files in the LUN space, that space is not returned to the "pool" so to
speak.  It remains allocated for that LUN.

Denys

-----Original Message-----
From: HP-3000 Systems Discussion [mailto:[log in to unmask]]On
Behalf Of David N Lukenbill
Sent: Monday, February 16, 2004 4:27 PM
To: [log in to unmask]
Subject: Re: [HP3000-L] VA7110 LUN usage

Ran a test today....  I did some "store to disk" operations to consume
my
disk space.  As the STORE operations progressed, the CV SCM "Capacity"
number tracked fairly closely with the "discfree c - in use" number.
When
most of my space on the four LUNs was gone, I purged the disk store
files.
The following is what I'm observing now:

      From Command View SDM               From Discfree C
            LUN         Capacity                LDEV        "In Use"
            1           73%                     1           10%
            2           95%                     2           9%
            3           95%                     3           8%
            4           95%                     4           9%
            5           0%                      30          0%
            6           0%                      31          0%
            7           0%                      32          0%
            8           0%                      33          0%
            9           0%                      34          0%
            10          0%                      35          0%


It looks like I only get to see the maximum usage from Command View SDM.
I
would have thought that a purge operation would have been reflected
within
Command View SDM as well.

David N. Lukenbill







Actually, I have 6 other 36Gb LUNs defined in the VA7110 which are
currently 0% used.  (I'm still setting up the system, and haven't yet
restored those volume sets.)

David N. Lukenbill





Goetz Neumann wrote:

I will admit I have not much idea of CommandView, but I am
speculating that what it tells you about the LUNs are the
percentages of the overall VA's capacity being used by
these LUNs.

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