ii(7D) Devices ii(7D)NAMEii - 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 ALSOiiadm(1M), ioctl(2), attributes(5), sv(7D)SunOS 5.11 8 Jun 2007 ii(7D)