Maxtor 10K III User Manual

Maxtor Atlas 10K III

5-91

Table 5-113   

The data format and field descriptions for the PERSISTENT RESERVATION IN 
Read Reservations Descriptor are described in Table 5-114 and Table 5-115 
respectively.

Table 5-114   

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"()**+

Generation

The value in this field is a 32-bit counter in the device server that is incremented 
each time a PERSISTENT RESERVATION OUT command requests a Register, Clear, 
Pre-empt, or Pre-empt and Clear operation. Note that PERSISTENT RESERVATION 
IN commands do not increment the counter, nor do PERSISTENT RESERVATION 
OUT commands that perform a Reserve or Release service action, or by a PERSIS-
TENT RESERVATION OUT command that is not done due to an error or a reservation 
conflict. The value in the Generation field is set to 0 as part of the power on or reset 
processes.

The value in the Generation field allows the application client that examines the value 
to verify that the configuration of the initiators attached to a logical unit has not been 
modified by another application client without any notification of the application cli-
ent doing the examination.

Additional 

Length

This field contains the count of the number of bytes of Reservation descriptors 
(bytes 8 – 

). Note that this field contains the number of bytes regardless of the val-

ue prescribed by the Allocation Length field in the command’s CDB.

Reservations 

Descriptors

One Reservation descriptor is reported for each unique persistent reservation on the 
logical unit when the PERSISTENT RESERVATION IN command has indicated a Read 
Reservations action. Table 5-118 and Table 5-115 detail the contents of each Res-
ervation Descriptors field.

*

5

>

'

%

$

0 - 7

(MSB)

Reservation Key

(LSB)

8 - 11

(MSB)

Scope-Specific Address

(LSB)

12

Reserved

13

Scope

Type

14 - 

15

(MSB)

Extent Length

(LSB)