Dell PowerVault ML6000 Dell PowerVault ML6000 SCSI Reference Guide - Page 70

Read Element Status Response, Element Status Header

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Read Element Status Response Element status data consists of an eight-byte header, followed by one or more element status pages (per element type). Each element status page consists of a header, followed by one or more element descriptor blocks. A complete response then looks like: Element Status Header Element Status Page Header (first element type) Element Descriptor ...(more descriptors)... Element Descriptor ...(more status pages)... Element Status Page Header (next element type) Element Descriptor ... Element Descriptor There are only up to four Element Status Pages, one for each element type. Element Status Header One header is returned for each READ ELEMENT STATUS command. The format is shown in the following table. Table 59 Element Status Header format Byte Bit 7 6 5 4 3 2 1 0 0 First Element Address Reported 1 2 Number of Elements Available 3 4 Reserved 5 Byte Count of Report Available 7 First Element Address Reported - This field indicates the lowest element address found that meets the CDB request. Number of Elements Available - This field indicates the number of elements found that meet the CDB request. Byte Count of Report Available - This field indicates the number of available element status bytes that meet the CDB requirements. The value does not include the eight-byte element status header, and is not adjusted to match the value specified in the Allocation Length field of the CDB. This facilitates first issuing a READ ELEMENT STATUS command with an allocation length of eight bytes in order to determine the allocation length required to transfer all the element status data specified by the command. 60 SCSI Commands

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60
SCSI Commands
Read Element Status Response
Element status data consists of an eight-byte header, followed by one or more element status pages (per
element type). Each element status page consists of a header, followed by one or more element descriptor
blocks. A complete response then looks like:
Element Status Header
Element Status Page Header (first element type)
Element Descriptor
…(more descriptors)…
Element Descriptor
…(more status pages)…
Element Status Page Header (next element type)
Element Descriptor
…
Element Descriptor
There are only up to four Element Status Pages, one for each element type.
Element Status Header
One header is returned for each READ ELEMENT STATUS command. The format is shown in the following
table.
First Element Address Reported
– This field indicates the lowest element address found that meets the
CDB request.
Number of Elements Available
– This field indicates the number of elements found that meet the CDB
request.
Byte Count of Report Available
– This field indicates the number of available element status bytes that
meet the CDB requirements. The value does not include the eight-byte element status header, and is not
adjusted to match the value specified in the Allocation Length field of the CDB. This facilitates first issuing
a READ ELEMENT STATUS command with an allocation length of eight bytes in order to determine the
allocation length required to transfer all the element status data specified by the command.
Table 59
Element Status Header format
Bit
Byte
7
6
5
4
3
2
1
0
0
First Element Address Reported
1
2
Number of Elements Available
3
4
Reserved
5
Byte Count of Report Available
7