1ii(7D) Devices ii(7D)
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3
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6 ii - Instant Image control device
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9 The ii device is a control interface for Instant Image devices and con‐
10 trols the Instant Image module through the ioctl(2) interface.
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13 Instant Image is a point-in-time volume copy facility for the Solaris
14 operating environment that is administered through the iiadm(1M) com‐
15 mand. With Instant Image, you can create an independent point-in-time
16 copy of a volume or a master volume-dependent point-in-time view. You
17 can also independently access the master and shadow volume for read and
18 write operations. Instant Image also lets you update the shadow volume
19 from the master volume or restore the master volume from the shadow.
20 (Restore operations to volumes can be full or incremental). Instant
21 Image supports fast volume re-synchronization, letting you create a new
22 point-in-time volume copy by updating the specified volume with only
23 changed data.
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26 To create a shadow volume you need a:
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28 1. Master volume to be shadowed.
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30 2. Shadow volume where the copy will reside. This volume must
31 be equal to or larger than the master volume.
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33 3. Administrative bitmap volume or file for tracking differ‐
34 ences between the shadow and master volumes. The administra‐
35 tive bitmap volume or file must be at least 24Kbytes in size
36 and requires 8KBytes for each GByte (or part thereof) of
37 master volume size, plus an additional 8KBytes overhead. For
38 example, to shadow a 3GByte master volume, the administra‐
39 tion volume must be 8KBytes + (3 * 8KBytes) =32KBytes in
40 size.
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43 The Instant Image module uses services provided by the SDBC and SD_GEN
44 modules. The SV module is required to present a conventional block
45 device interface to the storage product interface of the Instant Image,
46 SDBC and SD_GEN modules.
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49 When a shadow operation is suspended or resumed, the administration
50 volumes may be stored in permanent SDBC storage or loaded and saved to
51 and from kernel memory. The ii_bitmap variable in the /ker‐
52 nel/drv/ii.conf configuration file determines the administration volume
53 storage type. A value of 0 indicates kernel memory, while a value of 1
54 indicates permanent SDBC storage. If the system is part of a storage
55 products cluster, use the 1 value (permanent storage), otherwise use
56 kernel memory (0 value).
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59 kernel/drv/ii 32- bit ELF kernel module (x86).
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62 /kernel/drv/ii.conf Configuration file.
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66 See attributes(5) for a description of the following attributes:
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71 ┌─────────────────────────────┬─────────────────────────────┐
72 │ ATTRIBUTE TYPE │ ATTRIBUTE VALUE │
73 ├─────────────────────────────┼─────────────────────────────┤
74 │Architecture │x86 │
75 ├─────────────────────────────┼─────────────────────────────┤
76 │Availability │SUNWiu │
77 ├─────────────────────────────┼─────────────────────────────┤
78 │Interface Stability │Committed │
79 └─────────────────────────────┴─────────────────────────────┘
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82 iiadm(1M), ioctl(2), attributes(5), sv(7D)
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86SunOS 5.11 8 Jun 2007 ii(7D)