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https://library.netapp.com/ecmdocs/ECMLP2547958/html/GUID-ED0B4F48-67FD-40B2-ADAF-544C6EC715F6.html
The Linux Host Utilities support ALUA (asymmetric logical unit access) on hosts running Red Hat Enterprise Linux or SUSE Linux Enterprise Server and a version of Data ONTAP that supports ALUA. Note: ALUA is also known as Target Port Group Support (TPGS).
https://bugzilla.redhat.com/show_bug.cgi?id=482737
Asymmetric Logical Unit Access (ALUA) support in device-mapper-multipath has been updated, adding explicit ALUA support for Clariion storage. Earlier versions of Red Hat Enterprise Linux 5 added support for implicit ALUA (i.e. the operating system is not aware of which storage device paths have optimized performance and which have non-optimized performance).
https://www.suse.com/support/kb/doc/?id=7023021
ALUA port group messages . ... If the storage supports ALUA (Asymmetric Logical Unit Access), the messages show the detected port groups and their supported ALUA states. ... Expanded Support. Support for common Linux platforms. SUSE Shop. Buy your subscription online. Support Resources
https://www.suse.com/support/kb/doc/?id=7020971
HP 3PAR array has moved to support ALUA. Starting in SLES12-GA, the defaults for "3PARdata" devices have been changed and updated, however those changes were not back ported to SLES11 due to the potential for conflicts.
https://www.dell.com/community/PowerVault/MD36xx-38xx-with-Linux-multipath-conf-quot-service-time-quot/td-p/7422938
Nov 28, 2019 · Important Note: Linux kernels 4.3 and newer automatically attach a device handler to known devices (which includes all devices supporting SCSI-3 ALUA) and disallow changing the handler afterwards. Setting hardware_handler for such devices on these kernels has no effect. ... Comparing with an older device, it doesn't support ALUA (TPGS=0) and it ...
https://access.redhat.com/solutions/962403
How do I tell if ALUA is enabled on a LUN? Apart from checking the SAN configuration, how can I tell if a LUN is in active-active or active-passive mode? Environment. Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 5; SAN storage
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