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From: rob@array.UUCP (Rob Marchand)
Newsgroups: comp.unix.xenix,comp.unix.questions
Subject: Re: moby bignum tty accesses in /usr/adm/wtmp
Message-ID: <578@array.UUCP>
Date: Fri, 16-Oct-87 13:50:56 EDT
Article-I.D.: array.578
Posted: Fri Oct 16 13:50:56 1987
Date-Received: Sat, 17-Oct-87 18:47:22 EDT
References: <1134@gilsys.UUCP>
Reply-To: rob@array.UUCP (Boss Hog)
Distribution: na
Organization: Array Systems Computing, Toronto, Canada
Lines: 45
Xref: dciem comp.unix.xenix:819 comp.unix.questions:3924
Summary: Probably bad CD

In article <1134@gilsys.UUCP> mc68020@gilsys.UUCP (Thomas J Keller) writes:
 
>Problem:  /usr/adm/wtpm growing at alarming rate (>500K/day).  Manual
>	  checking revealed a *LARGE* number (on the order of 9000) accesses
>	  to /dev/tty02 beginning at 03:00 and continuing through 04:29,
>	  at the rate of approximately 95-120 accesses per MINUTE! (rate
>	  is somewhat variable, depending on what else is happening on the

	   It is likely caused by getty processes being spawned and 
	   quickly dying when no carrier signal is detected.  I've seen
	   this on our system when the cable was unplugged from the modem
	   (also a hayes), which provides a Carrier Detect signal whether
	   or not a carrier is present.  Same symptoms; wtmp grows like
	   hell, and performance drops like hell (although its no prize
	   here anyways :-)

>	  system.  In particular, the rate drops below 100 after 04:00, as
>	  that is when I unbatch received news for the day)  Checking
	
	   This probably is just a result of the load that unbatching
	   places on the system;  I would guess (I've stuck my foot
	   in it now, why quit) that this is what is slowing the
	   respawning of the gettys down (maybe because of news
	   decompression?)
>
>Query:  what in the name of GHU is going on!????  Could the problem be in the
>	Hayes modem?  If so, why would it start and stop the way it does?
>
	    Two things; check the dip switch on the modem to ensure that
	    it provides a carrier detect (or get a getty program that
	    has some smarts; uugetty seems to work for us), and check
	    to see that the serial line provides the CD signal....
>
>
>-- 
>Tom Keller 

		Good Luck
		  Rob M.
		  rob@array.UUCP
-- 
Rob Marchand                   UUCP: {mnetor,utzoo}!lsuc!array!rob
Array Systems Computing        ARPA: rob%array.UUCP@uunet.UU.NET
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