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тАО12-20-2005 02:37 PM
тАО12-20-2005 02:37 PM
EVA VDISK creation and preferred path options
Thanks,
Dave
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тАО12-20-2005 06:53 PM
тАО12-20-2005 06:53 PM
Re: EVA VDISK creation and preferred path options
I have installed several EVA yet.
I always take the option no preference on the EvA.
I balance the load on the servers through securepath or native failover if the os can handle is.
When I use mpio i also take the default option. I never had performance problems
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тАО12-20-2005 10:49 PM
тАО12-20-2005 10:49 PM
Re: EVA VDISK creation and preferred path options
- If the OS uses secure path, like hp-ux, windows, linux, the only supported preferred path option is "failover only"
- If the OS does not requries secure path, like Tru64 or OpenVMS, you can select any failover method (failover only/failover and failback).
- All copy sets in a DR group must have the same preferred path configuration, because all must failover at the same time.
Then, you can use evaperf to verify the controller that servers a particular vdisk, and the controller utilization.
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тАО12-21-2005 02:02 AM
тАО12-21-2005 02:02 AM
Re: EVA VDISK creation and preferred path options
So if I choose no preference, will the controllers load balanace themeselves and make sure any copy sets that are needed for CA are on the proper controller?
If I have several LUN's in a DR Group is there any disadvantage to using no preference as opposed to the other choices?
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тАО12-21-2005 02:27 AM
тАО12-21-2005 02:27 AM
Re: EVA VDISK creation and preferred path options
The DR group won't have problems if you configure no preferrence, but you will have better performance if you distribute the load between the controllers.
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тАО12-21-2005 03:04 AM
тАО12-21-2005 03:04 AM
Re: EVA VDISK creation and preferred path options
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тАО12-21-2005 05:05 AM
тАО12-21-2005 05:05 AM
Re: EVA VDISK creation and preferred path options
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тАО12-21-2005 06:06 AM
тАО12-21-2005 06:06 AM
Re: EVA VDISK creation and preferred path options
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тАО12-21-2005 06:26 AM
тАО12-21-2005 06:26 AM
Re: EVA VDISK creation and preferred path options
Tru64
Solaris
Windows
is it best to use "no preference" and let the array manage preferred paths, or is it advisable to plan out which preferred path setting will be used on each LUN.
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тАО12-21-2005 06:29 AM
тАО12-21-2005 06:29 AM