PRIMECLUSTER Global Disk Services Configuration and Administration Guide 4.1 (Solaris(TM) Operating System) |
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Chapter 2 Objects | > 2.7 GDS Snapshot Objects | > 2.7.2 Shadow Object |
A physical disk registered with a shadow class is called a shadow disk. A shadow disk is the shadow object corresponding to an SDX disk that is an SDX object.
When SDX disks and shadow disks do not have to be classified particularly, they may be called "disks" collectively.
A shadow disk has the following attributes.
When it is registered with a class in another domain and managed as an SDX disk, the shadow disk must be named as same as the SDX disk in the said domain.
When data has been copied on it from an SDX disk with the disk unit's copy function, the shadow disk must be named as same as the copy source SDX disk.
The operation other than status display is not available from Management View. Use the command for each operation.
A shadow disk can have the following status.
There are the following points of concern for shadow disks.
The physical disk that is registered with a class in a certain domain (domain alpha) with the sdxdisk -M command and accordingly is managed as an SDX disk can be registered with a shadow class in another domain (domain beta) with the sdxshadowdisk -M command and accordingly be managed as a shadow disk. The shadow disk must be named as same as the SDX disk.
The physical disk (c1t1d2 in the figure below) to which the private slice has been copied with the disk unit's copy function from the physical disk that is registered with a class in a certain domain (domain alpha) with the sdxdisk -M command and accordingly is managed as an SDX disk (c1t1d1 in the figure below) can be registered with a shadow class in the same domain (domain alpha) or in another domain (domain beta) with the sdxshadowdisk -M command and accordingly be managed as a shadow disk. The shadow disk must be named as same as the SDX disk.
Physical Device Name
The same physical device name (such as c1t1d1) is not necessarily assigned to the identical physical device in domain alpha and domain beta.
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