freebsd-scsi Digest, Vol 361, Issue 3
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Today's Topics:
1. Asymmetric logical unit access(ALUA) and FreeBSD (Omer Faruk Sen)
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Message: 1
Date: Fri, 26 Mar 2010 10:27:59 +0200
From: Omer Faruk Sen <omer...@gmail.com>
Subject: Asymmetric logical unit access(ALUA) and FreeBSD
To: freebs...@freebsd.org
Message-ID:
<75a268721003260127o4de...@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1
I want to know if FreeBSD supports Asymmetric logical unit access ?
>From http://www.vicengle.org/san/dmp.php
ALUA, Asymmetric logical unit access
ALUA is a relatively new multipathing technology for asymmetrical
arrays. If the array is ALUA compliant and the host multipathing layer
is ALUA aware then virtually no additional configuration is required
for proper path management by the host. An Asymmetrical array is one
which provides different levels of access per port. For example on a
typical Asymmetrical array with 2 controllers it may be that a
particular LUN's paths to controller-0 port-0 are active and optimized
while that LUN's paths to controller-1 port-0 are active
non-optimized. The multipathing layer should then use paths to
controller-0 port-0 as the primary paths and paths to controller-1
port-0 as the secondary (failover) paths. Sun Solaris 10 MPxIO is an
example of an ALUA aware multipathing solution. A Netapp FAS3020 with
Data ONTAP 7.2.x is an example of an ALUA compliant array.
Regards.
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End of freebsd-scsi Digest, Vol 361, Issue 3
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