FAS and V-Series Storage Systems Discussions

HA pair FC single path per controller question

datamethz

Hello,

We have recently adquired a FAS2240 dual controller running 8.2P2, options cf.takeover as follow on both nodes:

cf.takeover.bypass_optimization off

cf.takeover.change_fsid      on

cf.takeover.detection.seconds 15

cf.takeover.on_disk_shelf_miscompare off

cf.takeover.on_failure       on

cf.takeover.on_network_interface_failure off

cf.takeover.on_network_interface_failure.policy all_nics   (same value in local+partner recommended)

cf.takeover.on_panic         on

cf.takeover.on_reboot        off

cf.takeover.on_short_uptime  on

cf.takeover.use_mcrc_file    off        (value might be overwritten in takeover)

cf.takeover.bypass_optimization off

cf.takeover.change_fsid      on

cf.takeover.detection.seconds 15

cf.takeover.on_disk_shelf_miscompare off

cf.takeover.on_failure       on

cf.takeover.on_network_interface_failure off

cf.takeover.on_network_interface_failure.policy all_nics   (same value in local+partner recommended)

cf.takeover.on_panic         on

cf.takeover.on_reboot        off

cf.takeover.on_short_uptime  on

cf.takeover.use_mcrc_file    off        (value might be overwritten in takeover)

                  Local

Adapter Type      State                  Status

---------------------------------------------------

  1a   initiator  CONFIGURED.            offline

  1b   target     CONFIGURED             online

                  Local

Adapter Type      State                  Status

---------------------------------------------------

  1a   initiator  CONFIGURED.            offline

  1b   target     CONFIGURED             online

We presented a 50GB LUN to a Linux box, when we do disconnect the FC cable from one of the controllers, the one that owns a LUN, it does not automatically failover to the other controller but instead the Linux box stops seeing the LUN.

is it possible to have the HA configuration takeover when a FC link is down? We have a single path per controller, so if we loose that path everything goes down.

Thank you

1 REPLY 1

aborzenkov

Yes, it's possible. You need to connect host to both filer heads. There is no filer level failover when FC connection breaks - hosts at use supported multipathing software to handle it.

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