SCSI Description

 

 

Persistent Reservation Type Codes and Their Meanings

 

 

 

 

Table5-

121

 

 

READS: Shared; any application client on any initiator may execute com-

 

 

mands that perform transfers from the disk to the initiator.

 

 

WRITES: Prohibited; any command from any initiator that performs a trans-

%QFG0h

READ0COGShared

fer from the initiator to the disk&GUETKRVKQPresults in a reservation conflict.

 

 

ADDITIONAL RESERVATIONS: Allowed; any initiator may reserve the logi-

 

 

cal unit, extents, or elements as long as the persistent reservations do not

 

 

conflict with any reservations already known to the device server.

 

 

READS: Shared; any application client on any initiator may execute com-

 

 

mands that perform transfers from the disk to the initiator.

 

 

WRITES: Exclusive; any command from any initiator other than the initiator

1h

WRITE Exclu-

that holds the persistent reservation that attempts a transfer to the disk re-

sive

sults in a reservation conflict

 

 

 

ADDITIONAL RESERVATIONS: Allowed; any initiator may reserve the logi-

 

 

cal unit, extents, or elements as long as the persistent reservations do not

 

 

conflict with any reservations already known to the device server.

 

 

 

 

 

READS: Exclusive; any command from any initiator other than the initiator

 

 

that holds the persistent reservation that attempts a transfer from the disk

 

 

results in a reservation conflict

2h

READExclusive

WRITES: Shared; any application client on any initiator may execute com-

mands that perform transfers to the disk from the initiator.

 

 

 

 

ADDITIONAL RESERVATIONS: Allowed; any initiator may reserve the logi-

 

 

cal unit, extents, or elements as long as the persistent reservations do not

 

 

conflict with any reservations already known to the device server.

 

 

 

 

 

READS: Exclusive; any command from any initiator other than the initiator

 

 

holding the persistent reservation that attempts a transfer from the disk re-

 

 

sults in a reservation conflict.

 

 

WRITES: Exclusive; any command from any initiator other than the initiator

 

 

holding the persistent reservation that attempts a transfer to the disk results

3h

Exclusive Ac-

in a reservation conflict.

cess

 

 

ADDITIONAL RESERVATIONS: Restricted; any PERSISTENT RESERVA-

 

 

 

 

TION OUT command with the Reserve service action from any initiator other

 

 

than the initiator holding the persistent reservation results in a reservation

 

 

conflict. The initiator that holds the persistent reservation can reserve the

 

 

logical unit, extents, or elements as long as the persistent reservations do

 

 

not conflict with any reservations already known to the device server.

 

 

 

 

 

READS: Shared; any application client on any initiator may execute com-

 

 

mands that perform transfers from the disk to the initiator.

 

 

WRITES: Shared; any application client on any initiator may execute com-

 

 

mands that perform transfers to the disk from the initiator.

4h

Shared Access

ADDITIONAL RESERVATIONS: Restricted; any PERSISTENT RESERVA-

 

 

 

 

TION OUT command with the Reserve service action from any initiator other

 

 

than the initiator holding the persistent reservation results in a reservation

 

 

conflict. The initiator that holds the persistent reservation can reserve the

 

 

logical unit, extents, or elements as long as the persistent reservations do

 

 

not conflict with any reservations already known to the device server.

 

 

 

5-102 Maxtor Atlas 10K III

Page 166
Image 166
Maxtor 10K III manual Sults in a reservation conflict, 121