From 92fdb23069c885dbd87f78cad06dde18cd37339b Mon Sep 17 00:00:00 2001 From: Bart Van Assche Date: Fri, 25 May 2012 08:52:06 +0000 Subject: [PATCH] SCST README: Add two clarifications in the section about ALUA git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@4324 d57e44dd-8a1f-0410-8b47-8ef2f437770f --- scst/README | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/scst/README b/scst/README index 0954feb5b..61ae421db 100644 --- a/scst/README +++ b/scst/README @@ -1171,6 +1171,9 @@ information about how to associate iSCSI targets with a single physical interface. Notes: +- The ALUA specification allows but does not require that SCSI READ and WRITE + commands are rejected by ports that are not active. SCST processes READ and + WRITE commands received through ports that are not in the active state. - In a H.A. setup it is the responsibility of the user to synchronize ALUA information between the individual systems running SCST. There are no provisions in SCST to exchange ALUA information automatically between @@ -1183,6 +1186,10 @@ Notes: of the user to make sure that the information queried by an initiator is consistent independent of the LUN and the target port used by the initiator to query this information. +- Before building a H.A. setup consisting of two or more SCST systems one + should evaluate whether it's acceptable that persistent reservation commands + and SCSI task management commands will only be processed by a single node + instead of being processed by all nodes. Configuring ALUA in SCST ........................