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тАО10-03-2007 08:15 PM
тАО10-03-2007 08:15 PM
i have been trying to find a full explination of the Prefferd path/mode optuions you can choose from in command view EVA v6
there are 4 options (5 if you count no prefrence)
path A - failover only
path A - faiover/failback
path B - failover only
path B - faiover/failback
i take it Failover only means if path A becomes unavalible it will fail over to Path B and not fail back when path A comes back.
but failover/failBack means once path A comes back it will fail back over to it's prefferd path.
Cheers
SD
there are 4 options (5 if you count no prefrence)
path A - failover only
path A - faiover/failback
path B - failover only
path B - faiover/failback
i take it Failover only means if path A becomes unavalible it will fail over to Path B and not fail back when path A comes back.
but failover/failBack means once path A comes back it will fail back over to it's prefferd path.
Cheers
SD
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тАО10-03-2007 11:15 PM
тАО10-03-2007 11:15 PM
Solution
It should rather read 'controller' than 'path'. If a controller fails, management responsibility of its virtual disks is transferred to the surviving controller. 'failback' means that management is reverted if the failed controller comes back, although I have never tested that myself.
I see this has a 'hint' to establish a manual load distribution of virtual disks when the EVA starts. It is not always possible to manually transfer the ownership afterwards and a host can overrule this hint and request a failover on an active/passive array.
Current active/active EVAs can automatically transfer ownership if there is too much I/O going through the proxy controller.
It might still be necessary to choose a certain path preferrence for an specific operating system/ failover component (e.g. Linux QLogic failover driver).
I see this has a 'hint' to establish a manual load distribution of virtual disks when the EVA starts. It is not always possible to manually transfer the ownership afterwards and a host can overrule this hint and request a failover on an active/passive array.
Current active/active EVAs can automatically transfer ownership if there is too much I/O going through the proxy controller.
It might still be necessary to choose a certain path preferrence for an specific operating system/ failover component (e.g. Linux QLogic failover driver).
.
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тАО10-03-2007 11:17 PM
тАО10-03-2007 11:17 PM
Re: Preferred Path in Command View 6
cheers Uwe
The opinions expressed above are the personal opinions of the authors, not of Hewlett Packard Enterprise. By using this site, you accept the Terms of Use and Rules of Participation.
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