Date: Mon, 2 May 2005 05:08:14 +0100 From: "Steven Hartland" <killing@multiplay.co.uk> To: "Kris Kennaway" <kris@obsecurity.org> Cc: freebsd-hackers@freebsd.org Subject: Re: 5.4-STABLE corrupting fs on shutdown -p now? Message-ID: <001701c54ecc$921546d0$b3db87d4@multiplay.co.uk> References: <007901c54ec0$14bb3e30$b3db87d4@multiplay.co.uk> <20050502025305.GA29984@xor.obsecurity.org> <001c01c54ec4$1f58d880$b3db87d4@multiplay.co.uk> <20050502031444.GA40715@xor.obsecurity.org>
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Kris Kennaway wrote::
>> Surely thats what the buffer sync is doing. Watching the console both
>> these actions appear to be doing identical things but the end results
>> are quite different :( buffers are always under 5 usually 2 and its not
>> like there's been a great deal of activity. The last test I did was just a
>> boot, login, shutdown ( result was / not clean but all the others ok ).
>
> Modern IDE drives sometimes lie about having finished writing out the
> data, when in fact it's still only in cache. You should be able to
> disable this behaviour to test (try the BIOS).
I have a "HDD Post Write Buffer" in the BIOS according to the MB manual
although the disks aren't connected to the MB controllers they are on
RAID 5 set off a PCI-X card. Will give it a go tomorrow ( drag the monitor
back to the rack ). Will this have any performance penalties? I could
just avoid using shutdown -p but it seems a bit dodgy what its doing.
If this machine where miles away without remote console it would have
caused major amounts of pain.
Steve
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