Date: Thu, 8 Apr 1999 12:08:11 +0200 (CEST) From: Oliver Fromme <olli@dorifer.heim3.tu-clausthal.de> To: freebsd-stable@FreeBSD.ORG Subject: Re: How stable is soft updates? Message-ID: <199904081008.MAA19201@dorifer.heim3.tu-clausthal.de>
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jfesler@gigo.com wrote in list.freebsd-stable:
> [about soft-updates]
> 1: how stable is it :-)
We're using it on some boxes in production use, no problems so
far. One of them is a Squid web proxy, 512 Mb RAM, 3 x 9 Gb +
4.5 Gb disks, currently 800,000 files (and growing).
> 2: If I somehow manage to boot from a kernel lacking soft updates,
> will the partition still be mountable (ie, sans soft updates)?
It will just work (but without soft-updates, of course). Soft-
updates is not a special filesystem format or something like
that, it uses just the normal Berkeley FFS/UFS format. The
soft-update code just handles write access to such filesystems
in a special way (which is enabled by a single flag in the
"super block"). A kernel without soft-updates support will
just ignore that flag and handle write access the usual way.
> 3: How do we tunefs "/" ?
Boot in single-user mode ("boot -s"), make sure that "/" is
mounted read-only and is clean, tunefs, reboot. The following
example assumes you're using your first SCSI disk:
# mount
/dev/da0s1a on / (local, read-only)
# fsck /dev/rda0s1a
...
# tunefs -n enable /dev/rda0s1a
soft updates set
# reboot
It is not necesary to press the reset button (or even power-
off the machine) like it was in pre-3.1 days. I'm not sure
if it's necessary to reboot, it might even work to go multi-
user immediately. In any case, "mount" will tell you
afterwards if soft-updates was enabled successfully.
Regards
Oliver
--
Oliver Fromme, Leibnizstr. 18/61, 38678 Clausthal, Germany
(Info: finger userinfo:olli@dorifer.heim3.tu-clausthal.de)
"In jedem Stück Kohle wartet ein Diamant auf seine Geburt"
(Terry Pratchett)
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