Request Volume Element Address
220 SL500: Interface Reference Manual • July 2008 Revision: F • 96122
Request Volume Element Address Command Descriptions:
VolTag (Volume Tag) This bit indicates whether volume tag (VolTag) information is to be reported in
response to this command:
■ 0 = Volume Tag information is not reported.
■ 1 = Volume Tag information is reported.
Starting Element
Address
This field specifies the minimum element address to report. Only elements
with an address greater than or equal to the Starting Element Address are
reported.
The Starting Element Address must be a valid address for the library but does
not have to be an address of the type requested in the Element Type Code.
Number of Elements This field represents the maximum number of element descriptors to be
transferred.
Allocation Length This field specifies the length in bytes of the space allocated by the initiator for
the transfer of element descriptors. Only complete element descriptors are
transferred. Element descriptors are transferred until one of the following
conditions is met:
All available element descriptors of the type specified in the Element Type
Code have been transferred.
The number of element descriptors specified in the Number of Elements field
has been transferred.
There is less allocation length space available than required for the next
complete element descriptor or header to be transferred.
Request Volume Element
Address Data
The library returns data for a Request Volume Element Address command in:
■ An eight-byte Volume Element Address header, followed by
■ One to four element pages, one page per element type. A page consists of:
■ An eight-byte Element Status Page header, followed by
■ One or more Element Descriptors.
The format of the descriptor is based on the element type reported in this page.
There is a separate Element Descriptor format for each element type.
The data can be truncated based on the length specified in the allocation length
field.
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