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тАО12-04-2009 12:25 AM
тАО12-04-2009 12:25 AM
With reference to the above thread, could you please provide any docs which talks about proactive polling causing trespassing in Clariion.
Solved! Go to Solution.
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тАО12-04-2009 12:34 AM
тАО12-04-2009 12:34 AM
Re: Query on Proactive polling
check this on powerlink.emc.com
for example :
https://community.emc.com/message/410196
but if you don't have acoount you need to register.
mikap
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тАО02-03-2010 03:37 AM
тАО02-03-2010 03:37 AM
Re: Query on Proactive polling
As per my analysis, this should not be required.
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тАО02-23-2010 05:03 PM
тАО02-23-2010 05:03 PM
SolutionEMC contacted HP engineering, and
HP came up with the solution that proactive polling can be turned off with pvchange -p n command for being able to avoid excessive trespassing with other than HP active/passive arrays.
HP LVM originally utilized INQUIRY requests for its proactive polling implementation, however several years ago moved to utilizing READ requests to block 0 of the device. This behavior change presented a problem for EMC Clariion active /passive configurations with auto-trespass enabled in that the READ request arrival on the non-owner SP would trigger a trespass for that device, where as INQUIRY requests do not result in a trespass event. This made for a requirement to disable proactive polling for this type of configuration.
To summarize LVM proactive polling has to be turned off in case of PVLINKS setup.
For other type of configuration proactive polling can remain enabled, however if there is an underlying multipathing product such as Powerpath it would serve to handle path fault detection and IO request redirection as well as redirect the proactive polling READ requests to other path(s), so LVM proactive polling would serve no useful purpose in this scenario since LVM is above the multipathing product, but also harmless.
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тАО04-04-2010 02:59 PM
тАО04-04-2010 02:59 PM
Re: Query on Proactive polling
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тАО11-10-2010 01:01 AM
тАО11-10-2010 01:01 AM
Re: Query on Proactive polling
# pvchange -p n /dev/dsk/cXtYdZ