Re: sync & asyck i/o

From: Josh Myer (
Date: Tue Feb 06 2001 - 12:51:15 EST


On Tue, 6 Feb 2001, Alan Cox wrote:


> In theory for a journalling file system it means the change is committed to the
> log and the log to the media, and for other fs that the change is committed
> to the final disk and recoverable by fsck worst case
> In practice some IDE disks do write merging and small amounts of write
> caching in the drive firmware so you cannot trust it 100%. In addition some
> higher end controllers will store to battery backed memory caches which is
> normally just fine since the reboot will play through the ram cache.

Does this imply that in order to ensure my data hits the drives, i should
do a warm reboot and then shut down from the lilo: prompt or similiar?

apologies to bug you with a simple question, but i can see other people
worrying about data loss here too.


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