Archived from groups: comp.sys.ibm.pc.hardware.storage (
More info?)
I just did some reading about journaling file systems. To be honest, I was
not familiar with procedures of journaling file systems before reading your
post and doing some google searches. I have more questions now, and I
really hope you can give me a couple tips.
After reading your post, I am under the impression that we want to enable
write back caching on the RAID5 array, which will be an NTFS partition, yet
put the NTFS journal on a second disk somewhere else using write through
caching. I am thinking that this is a pretty good guarantee that I have a
good journal to compare my NTFS disk to should a power failure occur. This
sounds good, but how to implement such a plan? And once I have implemented
the plan, if the journal disk dies, is that a big problem for my array or
can I just specify another journal location? My machine is running XP Pro
with all current patches. First things first, where is the default journal
location and how do I change it?. I could ask more questions now but I
think this is a good starting point.
THANKS!
--Dan
"Arno Wagner" <me@privacy.net> wrote in message
news:c5hce0$1ne7t$2@ID-2964.news.uni-berlin.de...
> Your HDDs have write-buffering, and so does your OS. All will
> loose data when the power fails. A modern server OS may buffer
> data up to several minutes before flushing it to disk.
>
> The one thing you need to make sure is that your filesystem
> can live with it. There are some journalling filesystems that
> have trouble when writes are reordered and then the power fails.
>
> The solution is not to do write-through on the main filesystem, but
> to put the journal on a small disk (e.g. 50MB) with write-through.
> If you do write through on the main disk(s) you will get massive
> performance loss.
>
> Arno
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