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PA2AGA > TCPDIG 13.11.96 02:53l 92 Lines 3127 Bytes #-10824 (0) @ EU
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Subj: TCP-Group Digest 96/241
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Date: Tue, 12 Nov 96 21:18:33 MET
Message-Id: <tcp_96_241>
From: pa2aga
To: tcp_broadcast@pa2aga-1
Subject: TCP-Group Digest 96/241
X-BBS-Msg-Type: B
TCP-Group Digest Tue, 12 Nov 96 Volume 96 : Issue 241
Today's Topics:
File loss (2 msgs)
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----------------------------------------------------------------------
Date: Mon, 11 Nov 1996 09:00:17 +0000 (GMT)
From: Alan Cox <alan@cymru.net>
Subject: File loss
> full. Unix is great, but not as an embedded controller.
> I may have advised otherwise in the past, but I changed my
> mind :-)
You are just writing things the wrong way then. Stuff like QNX especially
would make a fantastic base for a bigger end amateur radio node on embedded
hardware like the 486SXF. Pity QNX is so expensive.
Alan
------------------------------
Date: Mon, 11 Nov 1996 08:54:20 +0000 (GMT)
From: Alan Cox <alan@cymru.net>
Subject: File loss
> systems we are using keep files open in RAM. When a power loss or crash
> happen those files in ram are lost. This looks like files were changed,
> which they are, but not by you.
Its a bit more complex than that as except for window 3.1x the other systems
have the sense to check disks on boot and ensure data is in a consistent
view. The unix like systems also bound the time before data from a file
is commited to disk to under 60 seconds. When writing system critical files
you can firstly write them to a new file then rename them over an existing
one, or secondly use the O_SYNC flag on open to ensure they are committed
immediately to disk (of course the disk itself has a cache so you dont
always win - at best you make the window much much smaller).
Opening/closing files has no bearing on this, a unixlike OS doesn't
think internally in file handles.
Alan
------------------------------
End of TCP-Group Digest V96 #241
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