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01-17-2012 11:30 AM
01-17-2012 11:30 AM
When I create a CPG in the Inform Management Console, it asks me for "Availability", and the choices are "Cage", "Port" and "Magazine". How does that influence how the chunklets are spread across the disks?
I think that "Cage" means that he takes one chunklet from every "cage" across all of the disk cages on the node-pair. Is that right? Then he comes back around and takes another chunklet from the same cage again, etc.
So what do "port" and "magazine" mean?
We have 2 x node pairs each with 4 x cages. Each cage has 10 x magazines, each magazine has 4 x disks.
Solved! Go to Solution.
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01-17-2012 07:55 PM - edited 02-28-2015 04:19 PM
01-17-2012 07:55 PM - edited 02-28-2015 04:19 PM
Re: Can anyone explain HP 3PAR CPG "Availability": Cage, Port, Magazine?
>I think that "Cage" means that he takes one chunklet from every "cage" across all of the disk cages on the node-pair.
>So what do "port" and "magazine" mean?
From the HP 3PAR InForm OS 3.2.1 Command Line Interface Reference:
createvv createcpg createtemplate setcpg showspace
–ha port|cage|mag
Specifies that the layout must support the failure of one port pair, one cage, or one drive magazine (mag). This option has no meaning for RAID-0.
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01-18-2012 06:19 AM
01-18-2012 06:19 AM
Re: Can anyone explain HP 3PAR CPG "Availability": Cage, Port, Magazine?
Thanks for answer. I understood that already. The question is how does the selection of -ha cage | port | mag affect the distribution of chunklets on the disks? Obviously cage means that the chunklets are distributed across different cages. Then "port" must mean that the chunklets are distributed across different port pairs; and "mag" must mean that the chunklets are distributed across different magazines? Does that sound right to you?
But let me ask you a question: Let's say I pick "mag". Do the chunklets distribute to the next mag in the same cage, or do they go to a mag in the next cage?
As near as I can tell, this isn't explained anywhere.
Stuart
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01-19-2012 06:01 AM
01-19-2012 06:01 AM
SolutionCage enforces taking each chunklet for a given RAIDset from separate disk cages/chassis/shelves. Port makes sure each chunklet comes from different ports. For a T or V class, Cage and Port are the same thing.
Magazine enforces taking each chunklet from separate magazines. Which magazine? You don't care. (Not documented.) That's why you specified "-ha mag".
Note: While I am an HPE Employee, all of my comments (whether noted or not), are my own and are not any official representation of the company
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01-19-2012 09:25 PM
01-19-2012 09:25 PM
Re: Can anyone explain HP 3PAR CPG "Availability": Cage, Port, Magazine?
>Does that sound right to you?
Yes.
>Let's say I pick "mag". Do the chunklets distribute to the next mag in the same cage, or do they go to a mag in the next cage?
If you only pick mag, then I assume it doesn't really matter where they are placed, as long as not the same one. The OS is free to pick based on what's free, what's fastest, etc.
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02-26-2012 05:07 AM
02-26-2012 05:07 AM
Re: Can anyone explain HP 3PAR CPG "Availability": Cage, Port, Magazine?
Hi
Availability means what happens in case of failure
'cage means the CPG will survive cage failure port means port failure and magazine means
magazine failure
Zohar