Date: Mon, 20 Feb 1995 18:26:18 -0800 (PST) From: Poul-Henning Kamp <phk@ref.tfs.com> To: rgrimes@gndrsh.aac.dev.com (Rodney W. Grimes) Cc: current@FreeBSD.org Subject: Re: newfs: sectors per cylinder (4096) disagrees with disk label (36) Message-ID: <199502210226.SAA21140@ref.tfs.com> In-Reply-To: <199502210222.SAA20630@gndrsh.aac.dev.com> from "Rodney W. Grimes" at Feb 20, 95 06:22:32 pm
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> > > This is caused by phk's changes to the behavior of newfs, it now
> > > uses 1 head/cylinder, 4096 sectors/track by default. This was an
> > > attempt to increase performace. I have found that it does nothing
> > > for any disks I use and just leads to problems while newfsing several
> > > of them.
> > How did you measure this ?
>
> Iozone using auto and 128 8192 and dd to/from /dev/{null,zero}.
> Note that the newfs code already defeats the rotational delay stuff
> by -n 1 -d 0 defaults.
>
Try this:
newfs /dev/rsdXy
mount /dev/sdXy /mnt
(cd /usr/src ; find . -print | cpio -dumpV /mnt)
time tar cf /dev/null /mnt
umount /mnt
--
Poul-Henning Kamp <phk@login.dknet.dk>
TRW Financial Systems, Inc.
I am Pentium Of Borg. Division is Futile. You WILL be approximated.
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