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Re: [Off-topic] Battery Backed NVRAM for journals ...



Hi,

On Mon, Feb 25, 2002 at 10:35:49AM +0100, Sven Rudolph wrote:
> "Stephen C. Tweedie" <sct redhat com> writes:
> 
> > > A fair bunch of people did a fair bunch of testing of this last year.
> > > Bottom line: RAM-based journals don't speed ext3 up.
> > 
> > Well, they did, but in general it was no better than adding an
> > external disk-based journal.
> 
> So I want to use a small RAID-1 to hold the journal for the 600GB
> RAID-5-based FS. Should be OK?

Yes.  That's a common config on some other OSes.

> I haven't found hints on sizing the external journal. How big should
> it be, and how do configuration factors (journalling mode e.g.)
> influence this?

It Depends.  What sort of things will you be using it for?  The
best journal size is more a function of the activity on the filesystem
than the filesystem size.

--Stephen





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