Maxtor 10K III manual Persistent reservations, Lu Ex

SCSI Description

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

mands that perform transfers from the disk to the initiator.

WRITE

WRITES: Exclusive; any command from an initiator that has not previously

5h

Exclusive,

performed a Register service action with the device server that attempts

Registrants

a transfer to the disk results in a reservation conflict

Only

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

ical unit, extents, or elements as long as the persistent reservations to not

conflict with any reservations already known to the device server.

READS: Exclusive; any command from an initiator that has not previously

performed a Register service action with the device server that attempts

a transfer from the disk results in a reservation conflict.

Exclusive

WRITES: Exclusive; any command from an initiator that has not previously

Access,

6h

performed a Register service action with the device server that attempts

Registrants

a transfer to the disk results in a reservation conflict

Only

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

ical unit, extents, or elements as long as the persistent reservations to not

conflict with any reservations already known to the device server.

7h - Fh

Reserved

N/A

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0COG

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Table 5-117

represents graphically all possible combinations of Persistent Reservations

Being Attempted when Persistent Reservations are already held for each of the types

of persistent reservations.

When Do Conflicts Between Existing Reservations and New Reservations Exist?

Table5-117

#NTGCF[￿*GNFWRITE

Exclu-

Persistent

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4GUGTXCVKQP￿

Reservation

READ

WRITE

READ

Exclu-

Shared

Exclu-

sive

Being At-

Shared

Exclu-

Exclu-

sive

Access

sive

Access

tempted

LU EX

sive

sive

Access

RO

RO

LU EX

LU EX

LU EX

LU EX

LU EX

LU EX

LU

N N

Y Y

Y Y

Y Y

Y Y

Y Y

READ Shared

EX

N N

Y O

Y O

Y O

Y O

Y O

LU

Y Y

Y Y

Y Y

Y Y

Y Y

Y Y

Y Y

WRITE

Exclusive

EX

Y O

Y O

Y O

Y O

Y O

Y O

Y O

LU

Y Y

Y Y

Y Y

Y Y

Y Y

Y Y

Y Y

READ

Exclusive

EX

Y O

Y O

Y O

Y O

Y O

Y O

Y O

LU

Y Y

Y Y

Y Y

Y Y

Y Y

Y Y

Y Y

Exclusive

Access *

EX

Y O

Y O

Y O

Y O

Y O

Y O

Y O

5-94 Maxtor Atlas 10K III