Persistent Reservation question

George_Penokie/Tivoli_Systems%TIVOLI_SYSTEMS at George_Penokie/Tivoli_Systems%TIVOLI_SYSTEMS at
Mon Nov 13 14:59:04 PST 2000

* From the T10 Reflector (t10 at, posted by:
* George_Penokie/Tivoli_Systems%TIVOLI_SYSTEMS at
All types of reservations are confined to a logical unit. So if you have 6
logical units you could have 6 reservations from 6 different initiators.

Bye for now,
George Penokie

Dept 2C6  114-2 N212
E-Mail:    gpenokie at
Internal:  553-5208
External: 507-253-5208   FAX: 507-253-2880

"Ulrich, David" <dulrich at> on 11/13/2000 03:41:33 PM

Sent by:  owner-t10 at

To:   "'t10 at'" <t10 at>
Subject:  Persistent Reservation question

I have a question regarding the degree of mutual exclusion of RESERVE
commands and PERSISTENT RESERVE IN/OUT commands.

In the SPC-2 working draft rev. 18, section 5.5.1, page 21, the third
paragraph states that "if a logical unit has been reserved by any RESERVE
command and is still reserved by any initiator, all PERSISTENT RESERVE IN
and all PERSISTENT RESERVE OUT commands shall conflict regardless of
initiator or service action and shall terminate with a RESERVATION CONFLICT

My question is, does that mean a PERSISTENT RESERVE IN/OUT command to any
logical unit or only the logical unit that is reserved using a RESERVE
command?  In other words, can the two different types of reservations
co-exist as long as they have been executed by different logical units?


David Ulrich
dulrich at
Storage Systems Division
LSI Logic Inc.

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