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May 24th, 2012 17:00
round robin mru
i created a new lun on a cx4-960. In vcenter it defaults to using mru as a multipath policy which shows 4 active path but 1 active path has I/O.
then i changed the policy to round robin and now it has 4 active paths and all 4 active paths shows I/O.
is this the prefereed config over mru if I dont have powerpath?
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Jingyi1
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May 24th, 2012 18:00
EMC's recommendation would be install PowerPath/VE and set the mode to CLAROpt (CLARiiON Optimized) for your environment. You can refer to below Best Practices. http://www.emc.com/collateral/software/white-papers/h6340-powerpath-ve-for-vmware-vsphere-wp.pdf
Conor
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May 25th, 2012 01:00
It depends on the FailoverMode you are using for the ESX initiators on the CX4.
If you are using FailoverMode 1, EMC recommends the MRU policy
If you are using FailoverMode 4 (ALUA) then , EMC recommends the RR policy.
Conor
tdubb123
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May 25th, 2012 10:00
04.29.000.5.019
tdubb123
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May 25th, 2012 10:00
how do i know if my system support alua?
its cx4-960
dynamox
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May 25th, 2012 10:00
it's supported (since flare 26)
dynamox
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May 25th, 2012 10:00
while recommended not required.
dynamox
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May 25th, 2012 10:00
you don't have to use PowerPath, we use native multipathing, failover mode on Clariion is set to 4 and policy on ESX is set to Round Robin.
dynamox
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May 25th, 2012 10:00
flare version ?
tdubb123
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May 25th, 2012 10:00
but i do no have powerpath ve license
tdubb123
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May 25th, 2012 11:00
so rr gives much better performance than mru?
dynamox
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May 25th, 2012 11:00
yes, it should use all available paths, enabling the distribution of load across the configured paths. For example if you have one LUN assigned to SPA and your host is zoned this zoning:
HBA 1 - SPA/SPB
HBA2 - SPA/SPB
then you will have 2 active paths, each one utilizing both HBAs.
tdubb123
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May 29th, 2012 13:00
are you haveing any issues with rr on active/passive array?
tdubb123
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May 29th, 2012 14:00
would tresspassing the lun cause any issues? getting mixed messages about active/passive should not be on rr. only on mru or fixed
dynamox
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May 29th, 2012 14:00
take a look at page 79
http://www.emc.com/collateral/hardware/technical-documentation/h8229-vnx-vmware-tb.pdf
dynamox
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May 29th, 2012 14:00
not at all, much better performance than MRU ..do make sure to set Failover mode to 4