ii man page on OpenIndiana

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ii(7D)				    Devices				ii(7D)

NAME
       ii - Instant Image control device

DESCRIPTION
       The ii device is a control interface for Instant Image devices and con‐
       trols the Instant Image module through the ioctl(2) interface.

       Instant Image is a point-in-time volume copy facility for  the  Solaris
       operating  environment  that is administered through the iiadm(1M) com‐
       mand. With Instant Image, you can create an  independent	 point-in-time
       copy  of a volume or a master volume-dependent point-in-time view.  You
       can also independently access the master and shadow volume for read and
       write  operations. Instant Image also lets you update the shadow volume
       from the master volume or restore the master volume  from  the  shadow.
       (Restore	 operations  to	 volumes  can be full or incremental). Instant
       Image supports fast volume re-synchronization, letting you create a new
       point-in-time  volume  copy  by updating the specified volume with only
       changed data.

       To create a shadow volume you need a:

	   1.	  Master volume to be shadowed.

	   2.	  Shadow volume where the copy will reside. This  volume  must
		  be equal to or larger than the master volume.

	   3.	  Administrative  bitmap  volume  or file for tracking differ‐
		  ences between the shadow and master volumes. The administra‐
		  tive bitmap volume or file must be at least 24Kbytes in size
		  and requires 8KBytes for each GByte  (or  part  thereof)  of
		  master volume size, plus an additional 8KBytes overhead. For
		  example, to shadow a 3GByte master volume,  the  administra‐
		  tion	volume	must  be  8KBytes + (3 * 8KBytes) =32KBytes in
		  size.

       The Instant Image module uses services provided by the SDBC and	SD_GEN
       modules.	 The  SV  module  is  required to present a conventional block
       device interface to the storage product interface of the Instant Image,
       SDBC and SD_GEN modules.

       When  a	shadow	operation  is suspended or resumed, the administration
       volumes may be stored in permanent SDBC storage or loaded and saved  to
       and   from   kernel   memory.  The  ii_bitmap  variable	in  the	 /ker‐
       nel/drv/ii.conf configuration file determines the administration volume
       storage	type. A value of 0 indicates kernel memory, while a value of 1
       indicates permanent SDBC storage.  If the system is part of  a  storage
       products	 cluster,  use	the 1 value (permanent storage), otherwise use
       kernel memory (0 value).

FILES
       kernel/drv/ii	      32- bit ELF kernel module (x86).

       /kernel/drv/ii.conf    Configuration file.

ATTRIBUTES
       See attributes(5) for a description of the following attributes:

       ┌─────────────────────────────┬─────────────────────────────┐
       │      ATTRIBUTE TYPE	     │	    ATTRIBUTE VALUE	   │
       ├─────────────────────────────┼─────────────────────────────┤
       │Architecture		     │x86			   │
       ├─────────────────────────────┼─────────────────────────────┤
       │Availability		     │SUNWiu			   │
       ├─────────────────────────────┼─────────────────────────────┤
       │Interface Stability	     │Committed			   │
       └─────────────────────────────┴─────────────────────────────┘

SEE ALSO
       iiadm(1M), ioctl(2), attributes(5), sv(7D)

SunOS 5.11			  8 Jun 2007				ii(7D)
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