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scst/README: Update the section about Linux initiator ALUA support

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git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@5454 d57e44dd-8a1f-0410-8b47-8ef2f437770f
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Bart Van Assche
2014-04-22 07:32:44 +00:00
parent 1762ababe5
commit 4f549fe5c1
1 changed files with 17 additions and 22 deletions
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@@ -1466,34 +1466,29 @@ Report target port groups:
Initiator Support
.................
On Linux systems implicit ALUA support is provided by the scsi_dh_alua driver
of the device mapper. You will have to modify at least the following in
/etc/multipath.conf:
* path_checker scsi_dh_alua
* prio_callout "/sbin/mpath_prio_alua /dev/%n"
On Linux systems implicit ALUA support is provided by the scsi_dh_alua kernel
driver in combination with the user space multipathd daemon. You will have to
modify at least the following in /etc/multipath.conf to enable implicit ALUA:
* hardware_handler "1 alua"
* prio alua
* path_grouping_policy group_by_prio
If your distribution does not provide a /sbin/mpath_prio_alua script, you can
use the following implementation:
$ cat /sbin/mpath_prio_alua
#!/bin/bash
# Given a SCSI device node, query the target port group asymmetric access
# state and report it in numeric form.
tpg_id="$(sg_vpd --page=di "$1" | sed -n 's/.*Target port group: //p')"
aas="$(sg_rtpg "$1" \
| grep -A1 "target port group id : $tpg_id" \
| tail -n 1 \
| sed 's/.*target port group asymmetric access state : //')"
echo $((aas))
Note: newer versions of multipathd support a parameter called
"detect_prio". It can be more convenient to enable this parameter instead of
setting the parameter "prio" to "alua" for only those LUNs that support ALUA.
More information about how to configure the device mapper and the scsi_dh_alua
driver can be found in the manual of your Linux distribution.
driver can be found in the manual of your Linux distribution ("man
multipath.conf").
Windows initiator systems support ALUA from Windows Server 2008 on. For more
information, see also:
* Microsoft, Multipathing Support in Windows Server 2008, MSDN
(http://blogs.msdn.com/b/san/archive/2008/07/27/multipathing-support-in-windows-server-2008.aspx).
information about ALUA support in Windows Server, see also:
* Microsoft, Windows Server 2008 R2 Multipath I/O Overview, MSDN
(http://technet.microsoft.com/en-us/library/cc725907.aspx).
* Microsoft, Multipathing Support in Windows Server 2008, July 2008, MSDN
(http://blogs.msdn.com/b/san/archive/2008/07/27/multipathing-support-in-windows-server-2008.aspx).
* Microsoft, ALUA MPIO Logo Test, MSDN
(http://msdn.microsoft.com/en-us/library/gg607458%28v=vs.85%29.aspx).
(http://msdn.microsoft.com/en-us/library/gg607458%28v=vs.85%29.aspx).
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