04-08-2018 06:01 AM - edited 03-01-2019 01:30 PM
How to make sure the SAN connectivity is redundant. How does SAN failover happen in UCS environment?
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04-08-2018 06:22 AM
I assume, your design is redundant
eg.
- each FI connected with native FC to a MDS or N5k (no dual homing)
- therefore physical dual FC fabric
- separate VSAN's (=/ 1) for Fabric A (VSAN-a) resp. B (VSAN-b)
- Service profile with 2 hba's, connecting to fabric A (VSAN-a) resp. fabric B (VSAN-b)
- on the Host OS install the proper multipathing software
- check that your multipath software see's a LUN over 2 paths.
- check Failover, by removing cable connecting FC to MDS ? or disabling vhba for a fabric.
04-08-2018 06:22 AM
I assume, your design is redundant
eg.
- each FI connected with native FC to a MDS or N5k (no dual homing)
- therefore physical dual FC fabric
- separate VSAN's (=/ 1) for Fabric A (VSAN-a) resp. B (VSAN-b)
- Service profile with 2 hba's, connecting to fabric A (VSAN-a) resp. fabric B (VSAN-b)
- on the Host OS install the proper multipathing software
- check that your multipath software see's a LUN over 2 paths.
- check Failover, by removing cable connecting FC to MDS ? or disabling vhba for a fabric.
04-08-2018 07:02 AM - edited 04-08-2018 07:03 AM
Greetings.
Unlike the Ethernet vNICs, vHBAs do not have UCSM fabric failover capabilities by design.
As Walter's check list explains, the dual Isolated SAN fabrics is a general industry best practice.
It is incumbent on your OS to be storage multipathing aware.
Most OS multipathing/NMP settings provide for redundancy fail-over as well as load balancing.
For ESXi, for example, you can individually disable specific paths, pull cables/disable storage uplinks, disable vHBAs (already mentioned by Walter).
UCSM also has a Fabric evacuation option, that will drop all Ethernet and storage UCSM connectivity for a specific FI, which is a good way to have a large scale multipathing fail-over test.
Thanks,
Kirk...
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