Date: Mon, 26 Nov 2012 21:53:23 +0100 From: Bas Smeelen <b.smeelen@ose.nl> To: freebsd-stable@freebsd.org Subject: Re: Help review the FAQ Message-ID: <50B3D6C3.1010400@ose.nl> In-Reply-To: <50B3D096.8020207@ose.nl> References: <CAF6rxgk9UJRk07SXfLzK97ZaTO0aTsoUQ9-06UzdnGV4JHL4ug@mail.gmail.com> <1353868081735-5764056.post@n5.nabble.com> <CAF6rxgkXOjRfupbRmfGCAsDeCMnP70JGdywxBw=QToyTOqpVmA@mail.gmail.com> <1353941396782-5764313.post@n5.nabble.com> <50B38A3F.6020001@gmail.com> <1353945307512-5764351.post@n5.nabble.com> <1353945435502-5764353.post@n5.nabble.com> <50B394D6.7070306@quip.cz> <1353947122759-5764360.post@n5.nabble.com> <50B3D096.8020207@ose.nl>
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On 11/26/12 21:27, Bas Smeelen wrote: > On 11/26/12 17:25, Jakub Lach wrote: >> Thanks! >> >> Regarding FAQ, some info about journalling should be added to >> "Chapter 9 Disks, File Systems, and Boot Loaders", especially now, >> when SU+J is default. Please also add: SU+J does not work (yet) with dump on a live filesystem i.e. use snapshot. If you want to use snapshot (dump -L) then disable the soft updates journal for that filesystem > > Add to FAQ 9.4 Which partitions can safely use Soft Updates? I have > heard that Soft Updates on / can cause problems. > > Journaled Soft Updates (SU+J) is now default on FreeBSD 9.x-RELEASE > installs. > This feature keeps a journal on soft updates which avoids a background > filesystem check and speeds up a filesystem check during boot to a few > seconds or less. > For history and technical details see: > http://jeffr-tech.livejournal.com/22716.html > and > http://www.*bsdcan*.org/2010/schedule/attachments/141_suj-slides.pdf > > This can also be enabled/disabled with tunefs -j enable | disable > For more information see man 8 tunefs > > ---------------- > > New FAQ 9.28 I have heard about TRIM for Solid State Drives (SSD), is > it supported by FreeBSD? > > The TRIM filesystem flag is very useful for devices that use > flash-memory (SSD for instance) and support the BIO_DELETE command. > This flag is not enabled by default and can be enabled/disabled with > tunefs -t enable | disable > For more information see man 8 tunefs > -t enable | disable > Turn on/off the TRIM enable flag. If enabled, and if the > under- > lying device supports the BIO_DELETE command, the file > system > will send a delete request to the underlying device for each > freed block. The trim enable flag is typically set when the > underlying device uses flash-memory as the device can use > the > delete command to pre-zero or at least avoid copying > blocks that > have been deleted. > > Important when using tunefs: > This utility does not work on active file systems. To change the > root > file system, the system must be rebooted after the file system is > tuned. > > FIlesystems have to be mounted read-only or not mounted at all
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