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тАО01-14-2010 09:13 AM
тАО01-14-2010 09:13 AM
- 1st LUN of a volume: "Path B - Failover Only";
- 2nd or 3rd LUN of a volume: "No preference"
The volumes are presented to two HP-UX servers in cluster (Service Guard). The servers use LVM and Alternate Link. (Every volume is also mirrored on a second EVA).
- I don't understand because also the first LUN isn't configured as "No preference".
- Does "Path B - failover only" mean that active controller is B, and the controller A works only if controller B fails?
Could someone help me to better understand?
Solved! Go to Solution.
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тАО01-14-2010 10:24 AM
тАО01-14-2010 10:24 AM
Re: EVA 4100 Path B Failover Only
If B fails, A takes over the management. If B comes back, A keeps the management.
If the majority of host I/O goes through A (this depends on the PVlinks path settings), after about a hour the EVA ignores "Path B - Failover Only" and moves management to A.
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тАО01-14-2010 11:00 AM
тАО01-14-2010 11:00 AM
SolutionTypically, you would make these settings to load balance your virtual disks across both controllers if your hosts were not abl to dynamically load balance them.
The setting translates to:
"Make the manageing controller Controller B, and when/if a failure happens... failover to Controler A... but if Controller B comes back online, don't worry about failback."
Steven
HP Master ASE, Storage, Servers, and Clustering
MCSE (NT 4.0, W2K, W2K3)
VCP (ESX2, Vi3, vSphere4, vSphere5, vSphere 6.x)
RHCE
NPP3 (Nutanix Platform Professional)
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тАО01-15-2010 07:35 AM
тАО01-15-2010 07:35 AM
Re: EVA 4100 Path B Failover Only
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тАО01-15-2010 07:45 AM
тАО01-15-2010 07:45 AM
Re: EVA 4100 Path B Failover Only
VMware ESX? I think you confuse 'multipath=be able to deal with multiple data paths to the same disk and do not create any "ghost devices"' with 'load balancing I/Os to the same disk across multiple paths'. 'multipathing' has worked for _years_.
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тАО01-15-2010 08:01 AM
тАО01-15-2010 08:01 AM
Re: EVA 4100 Path B Failover Only
I am trying to figure out the distinction.
Would it be correct to say "VMWARE would only support traffic down 1 fixed path"?
I think I have multipath misinterpreted. I am assuming "MPIO" implies multipath -- which is an incorrect assumption.
Multipath simply impies an operating systems capability to distinguish mutiple paths to the same disk. -- or NOT to see the same disk as multiple different disks?
Correct?