From ALAN at AI.AI.MIT.EDU  Wed May  6 00:20:25 1987
From: ALAN at AI.AI.MIT.EDU (Alan Bawden)
Date: Tue,  5 May 87 18:20:25 EDT
Subject: Datapoint on TCP buffer lossage
Message-ID: <195885.870505.ALAN@AI.AI.MIT.EDU>

The forget-to-free-the-SYN-packet problem than happens on AI and MC so
much, really -does- also happen on the KL!  After 12 days running, the KL
has managed to lose just two packets in this manner.  Perhaps the fact that
the KL is so much faster explains why it happens so rarely there?

From JOHNW at AI.AI.MIT.EDU  Tue May  5 14:25:18 1987
From: JOHNW at AI.AI.MIT.EDU (John Wilson)
Date: Tue,  5 May 87 08:25:18 EDT
Subject: No subject
Message-ID: <195618.870505.JOHNW@AI.AI.MIT.EDU>

Please add me to the mailing list.

	thanks,    John Wilson

From CENT at AI.AI.MIT.EDU  Tue May  5 11:38:08 1987
From: CENT at AI.AI.MIT.EDU (Pandora B. Berman)
Date: Tue,  5 May 87 05:38:08 EDT
Subject: MD up again
Message-ID: <195595.870505.CENT@AI.AI.MIT.EDU>

since MD is up again, and doesn't show any immediate signs of disk lossage,
i have added it back to the *MSGS and INQUIR update facilities.

From MRC%PANDA at SUMEX-AIM.Stanford.EDU  Mon May  4 09:05:09 1987
From: MRC%PANDA at SUMEX-AIM.Stanford.EDU (Mark Crispin)
Date: May 4 87 00:05:09 PDT
Subject: KS10 power fail
Message-ID: <12299611731.6.MRC@PANDA>

Hi.  I was reading some of the old BUG-ITS mail and saw some messages
about power fail recovery.  Forget about it on the KS10.  Although it
was originally going to be included (and I think the prototype machine
had it), production KS's don't have any battery backup for the MS10
memory.  Since MS10 is MOS based, once the power goes it gets nuked.

The best thing ITS can do is with a power fail interrupt is to quiet
down any disk traffic as quickly as possible (certainly nuke all reads
and any writes that aren't essential to prevent filesystem damage) and
halt.

Since KS10 power supplies are made by a real vendor and not DEC, KS's
don't see trivial little glitches.  The power has to be off for some
time, something like 250ms, for a KS to croak.  My KS has survived
power glitches that reset the digital clocks and zapped the TV!  So,
if you get a power fail interrupt there is a good chance that the
disks are already in the process of shutdown.
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