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1532
January 20th, 2009 01:00
PowerPath configuration
Hi ,
I am new to emc products and I want to know how Powerpath behaves ? If I have Solaris server having Volume Manger ,will I have to add both paths in PP ,or is one path Pri and one Sec or it chooses automatically and I see just one path .
Thanks in advance
I am new to emc products and I want to know how Powerpath behaves ? If I have Solaris server having Volume Manger ,will I have to add both paths in PP ,or is one path Pri and one Sec or it chooses automatically and I see just one path .
Thanks in advance
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Conor
341 Posts
0
January 20th, 2009 23:00
Once you run a powermt config then an emcpower pseudo device will be created.
CLARiiON Array: Once devices have been added to the storage group, the zoning on the fabric has been update to allow both HBA's to see both SP's, run a devfsadm command on the Solaris host, the devices will be created on the host in the form cXtYdZ. There is no need to worry about primary and secondary paths as PowerPath will look after all of that.
Once you run a powermt config then an emcpower pseudo device will be created.
Point all of your apps to use the emcpower devices and PowerPath will take care of all IO requests to the appropriate paths.
MaximUnited
111 Posts
1
January 20th, 2009 02:00
PP behaves depending on the type of license you have.
Unlicensed PP gives you only BasicFailover capabilities. Meaning, one active path at a time.
Fully licensed PP gives you both the Failover and the load-balancing capabilities.
Meaning, both paths are active and serve your i/o.
Hope that helps.
Maxim
rawstorage
2 Intern
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419 Posts
1
January 20th, 2009 05:00
as MaximUnited has stated, How PP depends on the licence that you have installed.
To add to this it also depends on the array type, if you have a symmetrix then there is no primary/secondary paths, all paths will appear as active alive in the powermt display dev=all output.
If you have Clariion then your array is active/passive again all paths will show as active alive but in addition you will see current SP owner in the powermt display dev=all; Also on the clariion you will see the default owner for the lun. There is no load balancing between SP's as this would cause unnecessary trespassing of luns.
example output
Pseudo name=emcpower1a
CLARiiON ID=APMxxxxxxxxx[SPPMA520] <Logical device ID=600601605DAC1A001079F4306997DB11 [LUN 90]>>Clariion Lun number
state=alive; policy=CLAROpt; priority=0; queued-IOs=0
Owner: default=SP A, current=SP A >>SP info
==============================================================================
---------------- Host --------------- - Stor - -- I/O Path - -- Stats ---
### HW Path I/O Paths Interf. Mode State Q-IOs Errors
==============================================================================
3080 pci@11c,600000/SUNW,qlc@1/fp@0,0 c12t5006xxxxxxxxxxxxxd1s0 SP A1 active alive 0 0
3080 pci@11c,600000/SUNW,qlc@1/fp@0,0 c12t5006xxxxxxxxxxxxxd1s0 SP B3 active alive 0 0
Once you run powermt config/powermt save all your paths will be configured into powerpath and emcpower devices will be configured for you. At this stage you have a choice of using native or pseudo device names for addressing your device;
Hope this makes things clear.
dynamox
9 Legend
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20.4K Posts
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January 20th, 2009 05:00
PowerPath for Solaris Installation and Administration Guide found at
Home > Support > Technical Documentation and Advisories > Software ~ P-R ~ Documentation > PowerPath Family > PowerPath Multipathing > Installation/Configuration
and this solution emc110411
avamar3
3 Posts
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January 20th, 2009 19:00