Re: Softupdates a mount option?

From: Bernd Walter <ticso_at_cicely12.cicely.de> Date: Thu, 27 May 2004 14:45:13 +0200 · This archive was generated by hypermail 2.4.0 : Wed May 19 2021 - 11:37:55 UTC

On Thu, May 27, 2004 at 02:25:10PM +0200, Ivan Voras wrote:
> Bruce Evans wrote:
> 
> > On Thu, 27 May 2004, Ivan Voras wrote:
> >
> >
> >>- I was creating a md drive with mdmfs, and it felt rather awkward to
> >>control softupdates via command line parameters (a sidequestion: does it
> >>make any sense enabling SU on a memory drive by default?). As it seems
> >>now, every such utility that handles (well, at least creates) a ffs
> >>filesystem must handle SU-controlling options as command line parameters.
> >
> >
> > It makes sense to never enable soft updates on a memory drive, since soft
> > updates uses extra CPU cycles to try to speed up i/o to real drives (and
> 
> Then maybe the default should be changed?
> 
> From 'man mdmfs':
>      By default, mdmfs creates a swap-based (MD_SWAP) disk with soft-updates
>      enabled and mounts it on mount-point.

swap != ram
SU makes perfectly sense for swap backed md drives.

-- 
B.Walter                   BWCT                http://www.bwct.de
bernd_at_bwct.de                                  info_at_bwct.de