2008/353 [zpool autoexpand property]

[Glenn Skinner]

    Date: Fri, 30 May 2008 15:19:45 -0700 (PDT)
    From: Matthew Ahrens <ahrens at sac.sfbay.sun.com>
    Subject: zpool autoexpand property [PSARC/2008/353 Self Review]

    ...
    B. PROBLEM

    With the addition of Dynamic LUN Expansion (PSARC 2006/373),
    Solaris now publishes a sysevent when an underlying device is
    expanded.  ZFS has been enhanced to take advantage of these events
    and will adjust the pool based on the new size of the expanded
    LUN.  However, administrators need the ability to control this
    behavior on individual pools.

    C. PROPOSED SOLUTION

    The introduction of the 'autoexpand' will allow administrators the
    ability to enable or disable automatic pool expansion when a
    Dynamic LUN Expansion event is received.  The syntax for setting
    the pool property utilizes the "set" subcommand defined in PSARC
    2006/577:

       # zpool set autoexpand=on <pool>
       # zpool create -o autoexpand=on <pool> <device> ..

I'm nearly certain I'm failing to see the obvious, but could you
explain why an administrator would ever want this property to be set
to "off"?

		-- Glenn