Messages in this thread |  | | From | "Miquel van Smoorenburg" <> | Subject | Re: Possible bug and question about ide_notify_reboot in drivers/ide/ide.c (2.4.19) | Date | Sat, 14 Sep 2002 13:42:06 +0000 (UTC) |
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In article <1032010655.12892.8.camel@irongate.swansea.linux.org.uk>, Alan Cox <alan@lxorguk.ukuu.org.uk> 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"
Putting the drive in stand-by mode has the side effect of flushing the cache. So before poweroff, send the FLUSH CACHE command, then send the standby command, hope that one of them works ..
I put put-the-drive-in-standby-mode stuff in halt.c of sysvinit after several reports of fs corruption at poweroff and it seems to have fixed the problems for the people who reported them.
Mike.
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