Re: Possible bug and question about ide_notify_reboot in drivers/ide/ide.c (2.4.19)

From: Alan Cox (alan@lxorguk.ukuu.org.uk)
Date: Sat Sep 14 2002 - 08:37:35 EST


On Sat, 2002-09-14 at 10:53, Matthias Andree wrote:
> How about this: The FLUSH CACHE command has only recently become a
> mandatory command for non-PACKET devices, so there may be drives that do
> implement a write cache, but do NOT implement the FLUSH CACHE -- and
> still adhere to some older edition of the ATA standard.

Worse than that. There are drives that did implement it - as a no-op.
They didn't even say "Umm sorry no can do"

> See above. Disable Write Cache would also do with recent drives.

Except some drives have a habit of turning it back on quietly

> If I recall correctly, Windows' shutdown procedure was at some time in
> the past changed to wait a couple of seconds before switching the ATX
> computers off, to allow the drives to flush their caches. I can't quote
> on a KB article though.

Flush on shutdown was apparently one of the windows 98 service pack/hot
fix additions.

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/



This archive was generated by hypermail 2b29 : Sun Sep 15 2002 - 22:00:36 EST