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тАО02-08-2011 11:55 AM
тАО02-08-2011 11:55 AM
About EVA 5000 with Secure Path
All the luns are presented by default, namely preferred path / mode "No preference".
Some of the luns have the managing controller "Controller A" and some the "Controller B".
The critical servers connected to the storage are HP-UX 11i V1 wih the Secure Path 3.0F
The options in the Secure Path are:
Load Balance: On Auto-restore: On Balance Policy: Round Robin
Path Verify: On Verify Interval: 30
In this configuration, there are 4 paths (2 actives and 2 standby as showed in attached document)
My question is:
Is this the optimal configuration ?
The I/O goes only for the active paths for each lun. Is that correct ?
Please, provide any clues according your experience.
Thanks in advance
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тАО02-08-2011 07:44 PM
тАО02-08-2011 07:44 PM
Re: About EVA 5000 with Secure Path
Optimal load balancing setting will depend on the actual usage of the LUNs in the system & the path to the controller owning the particular luns.
Depending on the IO load on each LUN, you can use secure path to configure a preferred path to a LUN with other path as standby. While doing this make sure that the preferred path is via the owning controller.
In you current situation, following will be applicable.
from user guide : http://h20000.www2.hp.com/bc/docs/support/SupportManual/c01683918/c01683918.pdf
Impact of load balancing and active paths
Preferred path and selected path are meaningless designations when you enable load balancing.
Load balancing treats all paths equally and directs I/O to all available paths. In other words, load
balancing is a higher priority than preferred or selected paths.
When load balancing is enabled, as a default, the Secure Path for Active-Passive device attempts to
use all the available paths to a LUN in a round-robin fashion.
If load balancing is enabled and you set the path as preferred, the driver marks the path as preferred,
but the path is not used as preferred until the load balancing is turned off.
If load balancing is enabled and you select a path, the system performs the following actions:
├в ┬в If the path is on the standby controller, I/O moves to the standby controller and the selected path
is one of the active paths.
├в ┬в If the path is on the active controller, the path continues to be used as one of the set of active path
Hari
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тАО02-08-2011 10:22 PM
тАО02-08-2011 10:22 PM
Re: About EVA 5000 with Secure Path
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тАО02-09-2011 05:33 AM
тАО02-09-2011 05:33 AM
Re: About EVA 5000 with Secure Path
1. The array will have to be re-cabled to support active-active paths. There is documentation for this, but also HP will do it during an upgrade if you have support.
2. SecurePath, supports EITHER Active-Passive (SecurePath), OR Active-Active (AutoPath). It used to be two separate bundles, but HP changed this in around 2005. You will need to uninstall SecurePath for A/P arrays and re-install for A/A arrays (it's a sub-package selection).
3. SecurePath once installed with A/A, just select Round-Robin as your load balancing policy, and you'll find you get the best overall performance.
4. Preferred paths config in CommandView EVA. This is only to support pvlinks. Yes, it does technically have an impact on Secure Path A/P, but it was never truly intended to.
So, yes, you do have an optimal configuration for VCS3.x and no, you don't have an overall optimal config.
Best regards,
Don
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тАО02-09-2011 07:18 AM
тАО02-09-2011 07:18 AM
Re: About EVA 5000 with Secure Path
it has always been possible to split vdisks across both controllers. This is not a new feature with active/active.
Even the old HSG controllers could do that in 1999.
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тАО02-09-2011 07:23 AM
тАО02-09-2011 07:23 AM
Re: About EVA 5000 with Secure Path
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тАО02-09-2011 07:34 AM
тАО02-09-2011 07:34 AM
Re: About EVA 5000 with Secure Path
This is different from the A/P firmware on the MSA1000, were all logical disks were owned by one controller at a time.
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тАО02-09-2011 08:12 AM
тАО02-09-2011 08:12 AM
Re: About EVA 5000 with Secure Path
Peternt: Sorry for hi-jacking the thread a little bit.
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тАО02-09-2011 08:34 AM
тАО02-09-2011 08:34 AM
Re: About EVA 5000 with Secure Path
lun1: Path A/failover/failback
lun2: Path B/failover/failback
lun3: Path A/failover/failback
lun3: Path B/failover/failback
and so on ?
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тАО02-09-2011 10:05 AM
тАО02-09-2011 10:05 AM
Re: About EVA 5000 with Secure Path
Yes, I know that the HP documentation sometimes calls a virtual disk a LUN.
The correct failover setting (failover-only or failover-failback) depends on the controller firmware, OS (version), multipath software and so on.
But yes, what you wrote is the basic idea.