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what difference between "Transparent Failover mode" and "Multibus Failover mode"

 
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Rambo_1
Regular Advisor

‎06-25-2007 03:43 PM

‎06-25-2007 03:43 PM

what difference between "Transparent Failover mode" and "Multibus Failover mode"

What difference between "Transparent Failover mode" and "Multibus Failover mode" in MA8000 disk array controller ?

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Rambo
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Uwe Zessin
Honored Contributor

‎06-25-2007 05:48 PM

‎06-25-2007 05:48 PM

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Re: what difference between "Transparent Failover mode" and "Multibus Failover mode"

Transparent failover (TF) only protects against the failure of a single controller. One controller presents units across Port_1, the other across Port_2. The other port of each controller is inactive. When a controller fails, this port becomes active and assumes the WWPN of the other controller's active port.

TF was only meant for operating systems without a multipath solution (e.g. Tru64 Unix version 4).

In multibus failover, all units are presented through all 4 cotnroller ports (assuming the LUN masking is set correctly, of course). A multipath-capable host can fail over between the paths.
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