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тАО09-04-2009 05:13 AM
тАО09-04-2009 05:13 AM
EVA diskgroup objectid
How is this ID generated, and can I relate this to the parent EVA? The obvious answer would be to look at
Knowing how
a) globally unique
b) never changes, if for example the disk group name changes
c) is never reused, for example the disk group is deleted and a new one is created, possibly with the same name.
The above would also apply for
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тАО09-05-2009 12:28 AM
тАО09-05-2009 12:28 AM
Re: EVA diskgroup objectid
If for example DR 8001 is deleted, the next DR created will have 8001 again.
I hope I make a bit sence here.
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тАО09-09-2009 01:17 AM
тАО09-09-2009 01:17 AM
Re: EVA diskgroup objectid
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тАО09-09-2009 09:20 AM
тАО09-09-2009 09:20 AM
Re: EVA diskgroup objectid
all these details are completely undocumented. Let's be realistic: even if somebody gives you an answer about the uniqueness of some UUIDs today it could change with the next firmware revision. (Remember how the SSSU 'SHOW' output changed its formatting any couple of releases?)
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тАО03-21-2010 12:22 PM
тАО03-21-2010 12:22 PM
Re: EVA diskgroup objectid
This time, it has been brought to my attention the following:
Look at the output from "ls system
...
...
Extract characters 9 to 27 from the string, you get B4080560D2470B00007.
Then do "ls disk_group full xml"
...
Same extraction, and you have a match.
This is also found in for example in hosts, vdisks and luns. Not in individual physical disks though. Seems like created "soft" objects share the same partial string, but not "hard" objects like controllers and disks.
Someone out there must have some knowledge about these structures, they can't be completely random.
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тАО03-21-2010 12:40 PM
тАО03-21-2010 12:40 PM
Re: EVA diskgroup objectid
When I checked it some years ago and unless this has changed:
Most of these bits come for the (at that time current) master controller's WWN.
> Someone out there must have some knowledge about these structures,
> they can't be completely random.
The original designer ;-)
The question is whether (s)he is willing/allowed to talk about these details or the company claims those are confidential.
It is hard enough to talk though L1/L2 and get some information about the SSSU tags when looking after a problem...
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тАО03-21-2010 01:00 PM
тАО03-21-2010 01:00 PM
Re: EVA diskgroup objectid
Thanks for trying Uwe, I'll see what I can dig up elsewhere.