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PERSISTENT RESERVE IN 5Eh
Commands
99
Returned data for service actions:
Read Keys service action
The drive will return a parameter list containing an 8-byte header and list of each currently
registered I_T nexus’ reservation key. Each key is 8 bytes long. The format of the returned data is
as follows:
Read Reservation service action
The drive returns a parameter list containing an 8-byte header and the persistent reservation, if
any, that is present in the drive. If no persistent reservation is present, Additional Length is 0 and
no reservation data is returned. If a persistent reservation is present, Additional Length is 10h and
16 bytes of reservation data are returned as follows:
7 6 5 4 3 2 1 0
0 (MSB)
PR Generation
3 (LSB)
4
Additional Length (n-7)
7
8
First Reservation Key
15
::
n
-7
Last Reservation Key
n
PR Generation A 32-bit counter that is maintained by the drive and incremented every time a
PERSISTENT RESERVE OUT command requests a Register, Register and Ignore Existing
Key, Clear, Preempt, or Preempt and Abort service action.
7 6 5 4 3 2 1 0
0 (MSB)
PR Generation
3 (LSB)
4
Additional Length (0 or10h)
7
8
Reservation Key
15
17
Obsolete (0)
19
20 Reserved (0)
21 Scope (0) Type
22
Obsolete (0)
23