Date: Fri, 26 Mar 2010 10:27:59 +0200 From: Omer Faruk Sen <omerfsen@gmail.com> To: freebsd-scsi@freebsd.org Subject: Asymmetric logical unit access(ALUA) and FreeBSD Message-ID: <75a268721003260127o4de50576m512862545fae292d@mail.gmail.com>
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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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