[HECnet] NT 4 on AlphaServer es40

[Johnny Billquist]

On 2013-02-13 22:34, hvlems at zonnet.nl wrote:
my point exactly: VMS handles these requests differently; at the cost of response time.

I should point out that you *can* put that information into NCP on RSX, it's just that you don't *need* to.

And VMS is just being plain silly to scan through the nodename database in the case where the MOP request have an explicit file name in the request. The NCP database is then only potentially used for one thing - if you want to not serve the MOP request.

I have not checked RSX here, but I wonder if it only do the scan in the case no filename is provided, or if it always do the scan anyway also on RSX. Either way, RSX responds before VMS even to seem to start thinking about it.

	Johnny

-----Original Message-----
From: Johnny Billquist <bqt at softjar.se>
Sender: owner-hecnet at Update.UU.SE
Date: Wed, 13 Feb 2013 22:31:24
To: <hecnet at Update.UU.SE>
Reply-To: hecnet at Update.UU.SECc: <hvlems at zonnet.nl>
Subject: Re: [HECnet] NT 4 on AlphaServer es40

On 2013-02-13 22:29, hvlems at zonnet.nl wrote:
Then why holds NCP the required load file for a given MAC address?

It don't on RSX...

That led me to believe that all the MOP client provided was a MAC address.

All ethernet packets provide a source MAC address... :-)

	Johnny

-----Original Message-----
From: Johnny Billquist <bqt at softjar.se>
Sender: owner-hecnet at Update.UU.SE
Date: Wed, 13 Feb 2013 22:24:54
To: <Paul_Koning at Dell.com>
Reply-To: hecnet at Update.UU.SECc: <hecnet at Update.UU.SE>
Subject: Re: [HECnet] NT 4 on AlphaServer es40

On 2013-02-13 20:39, Paul_Koning at Dell.com wrote:

On Feb 13, 2013, at 12:57 PM, Johnny Billquist wrote:

On 2013-02-13 18:52, Paul_Koning at Dell.com wrote:

On Feb 13, 2013, at 11:12 AM, Johnny Billquist wrote:
...
Fun detail: when devices want to MOP boot on a network where you have both a VAX and a PDP-11, the PDP-11 normally ends up serving the image, since it responds much faster than the VAX.

That's because the VMS MOP server did its lookup for a match in the node database by a linear search.   I never could convince the engineer responsible for that code to use a better algorithm.

Which is silly in it self. Why even search the node database? After all, the MOP request holds all the information needed to serve it. RSX don't do a lookup at a boot request. It just serves it.

I thought at least primary boot requests tend to just say "help me" so you need a lookup to find the name of the file to load.

Optional. At least DECservers actually provide in the request what file
they want to boot.

	Johnny





-- 
Johnny Billquist                                   || "I'm on a bus
                                                                  ||   on a psychedelic trip
email: bqt at softjar.se                         ||   Reading murder books
pdp is alive!                                         ||   tryin' to stay hip" - B. Idol