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тАО07-21-2009 09:11 PM
тАО07-21-2009 09:11 PM
UUID - multiple issues
1. When getting the MAC address it uses the overridden MAC address, not the default MAC address. Hence if the chosen ethernet adapter is running DECnet, a significant assumption of version 1 UUIDs is violated.
2. The byte order in the three time fields seems to be wrong. The spec says high-low (which is the opposite of platforms that VMS is used to but normal on the internet). It seems to me that the fields are returned low-high.
3. It isn't using the clock sequence field as intended. This isn't a problem as such.
4. The service is lacking functionality e.g. can't generate version 3, 4 or 5 UUIDs (version 1 UUIDs are considered a bit dubious for privacy and security reasons) and e.g. can't return the UUID as a string. A new optional second argument, being an itemlist, would do nicely.
5. f$unique(), which seemingly just invokes this service, might have been better to return its result with bytes reversed, at least as an option.
As it is, the MAC address is always the first 12 bytes of the result and hence, when used to create file names, you don't get a good spread of names.
If functionality were added to the service, as per item 4, then some or all of that should then be reflected in new functionality in f$unique().
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тАО07-22-2009 02:06 AM
тАО07-22-2009 02:06 AM
Re: UUID - multiple issues
Have you reported this to HP?
Purely Personal Opinion
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тАО07-22-2009 03:44 AM
тАО07-22-2009 03:44 AM
Re: UUID - multiple issues
Alan Potter was aware of similar issues about 15 years ago (including one I believe that would crash the system under load?)
I personally lodged an issue with $getdti where enteriung a wildcard lookup would only result in the wildcard portion of the response :-(
Perhaps not as important as IPsec but certainly less than 64bit addressing for RTR X86.
Good-luck!
Richard Maher
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тАО07-26-2009 07:59 PM
тАО07-26-2009 07:59 PM
Re: UUID - multiple issues
No, I know of no way of doing that myself.
Is anyone able to confirm either item 1 or item 2? (with the understanding that in order to confirm item 2 you would need familiarity with the cited RFC)
In case anyone does attempt to confirm, I am running V8.3-1H1 on Itanium hardware.
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тАО07-26-2009 09:07 PM
тАО07-26-2009 09:07 PM
Re: UUID - multiple issues
I make no claims for its effectiveness, but:
http://h71000.www7.hp.com/
"Send us your comments":
http://h71000.www7.hp.com/fb_business.html