Date: Wed, 8 Jun 2011 09:55:15 -0700 From: Jeremy Chadwick <freebsd@jdc.parodius.com> To: Andriy Gapon <avg@FreeBSD.org> Cc: freebsd-stable@FreeBSD.org Subject: Re: [SOLVED] Re: labelling root file system (RELENG_8) Message-ID: <20110608165515.GA95345@icarus.home.lan> In-Reply-To: <4DEFA5E3.8080806@FreeBSD.org> References: <4DEF7322.8030907@gmx.de> <BANLkTimBYL8e2y86m7GZv5U8hdok3KR%2B=w@mail.gmail.com> <4DEF8103.9030401@gmx.de> <20110608162626.GA94883@icarus.home.lan> <4DEFA5E3.8080806@FreeBSD.org>
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On Wed, Jun 08, 2011 at 07:40:03PM +0300, Andriy Gapon wrote: > on 08/06/2011 19:26 Jeremy Chadwick said the following: > > I have the exact same question except not with regards to labels but > > toggling TRIM capability on the root filesystem. > > > > - Start system > > - At loader, boot single-user (option 4) > > - At prompt choose /bin/sh > > - mount -a > > I think that this is a culprit. I'll try removing this step. > > - tunefs -t enable /dev/ada0s1a --- fails > > Shouldn't you have / mounted r/o here? > BTW, AFAIR, *re*-mounting root read-only won't help; it needs to have never been > mounted r/w. I'm a little confused by this sentence, so my apologise in advance. / is mounted read-only in single-user by default. Did you mean I should make it r/w by doing "mount -u -o rw /" ? I may have omitted this step. I will re-verify the exact procedure and exact steps in a moment, and reply here. > > - sysctl kern.geom.debugflags=16 > > - tunefs -t enable /dev/ada0s1a --- works > > - tunefs -p /dev/ada0s1a -- shows TRIM enabled > > - reboot > > I think that at this step your superblock on disk gets re-written with its copy in > memory which has never been updated. But not sure. Hmm, I sure hope that isn't the case. That would mean the only time a person can use tunefs on a root filesystem is when they either do it manually during the FreeBSD installation (adding "-t" to the list of newfs flags in the filesystem creation UI), or if they boot off of some other medium (USB flash drive, CD, PXE, etc.). -- | Jeremy Chadwick jdc@parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, US | | Making life hard for others since 1977. PGP 4BD6C0CB |
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