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тАО11-04-2009 11:14 AM
тАО11-04-2009 11:14 AM
How can we create Vdisks from same Controller(Say Controller A). I dont see any option to choose when creating Vdisk in CV!
I am creating a DR group and reading instructions from the manual says :
"A DR group can contain virtual disks from multiple disk groups, but all DR group member virtual disks must be in the same array and must be preferred to the same controller on the array"
Can any one explain? your help will be appreciated
Thanks
Solved! Go to Solution.
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тАО11-04-2009 11:21 AM
тАО11-04-2009 11:21 AM
Re: How to select the disks from Different controllers in EVA8K
Not sure what you are trying to do is relevant on EVA. The system load balances between controllers anyway, and LUN creation is from a GUI interface.
The array is designed to present all configured luns even if a controller fails.
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тАО11-04-2009 11:59 AM
тАО11-04-2009 11:59 AM
Re: How to select the disks from Different controllers in EVA8K
Thanks for your quick reply
I just dont understand what does it mean -
DR member virtual disks must be preferred to the same controller on the array " and "all members of a DR group must share
a preferred controller, therefore load balancing a single application with all of its virtual disks in a single DR group (as required) across multiple controllers, is not possible"
from the above statements .
Can u please explain ?
Thanks
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тАО11-04-2009 12:29 PM
тАО11-04-2009 12:29 PM
Re: How to select the disks from Different controllers in EVA8K
You can configure a Vdisk with a Preferred Controller, which is what it sounds like you need to do.
If I remember correctly, this option can be found under the Presentation tab for each Vdisk.
Hope this helps,
Regards,
Rob
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тАО11-04-2009 01:04 PM
тАО11-04-2009 01:04 PM
Re: How to select the disks from Different controllers in EVA8K
I just checked under presentation tab , it is automatically selected Managing controllers for vdisks (some as controller A and some other as Controller B)
I dont see any option to select the controllers !
Thanks
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тАО11-04-2009 01:25 PM
тАО11-04-2009 01:25 PM
Re: How to select the disks from Different controllers in EVA8K
If we are speaking on the ILT switched off in CA, then the reason is nicely described here:
http://www.frankdenneman.nl/?p=5
abstract:
All LUNs in a DR group fail over together, share a log and preserve write order within the group. Because one controller manages a group of LUNs, EVA firmware XCS 6.1 (and up) disables implicit LUN transitions for all DR group members.
Mixing Implicit LUN transition (ILT) together with a large DR group can be a recipe for disaster. Imagine if the array detects too much proxy reads on a LUN in the group. The array will evoke a ILT. Because they form a group, all members are transitioned together. So far so good, but you can bet on it that a new proxy read situation appears, due to the multiple hosts communicating with the disks. This will evoke another Implicit LUN transition. And now we are back where we started. Enabling Implicit LUN transition can create some sort of bouncing group of LUNs between controllers
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тАО11-04-2009 01:28 PM
тАО11-04-2009 01:28 PM
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тАО11-04-2009 01:54 PM
тАО11-04-2009 01:54 PM
Re: How to select the disks from Different controllers in EVA8K
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тАО11-05-2009 06:49 AM
тАО11-05-2009 06:49 AM