Date: Mon, 26 Nov 2012 21:27:02 +0100 From: Bas Smeelen <b.smeelen@ose.nl> To: freebsd-stable@freebsd.org Subject: Re: Help review the FAQ Message-ID: <50B3D096.8020207@ose.nl> In-Reply-To: <1353947122759-5764360.post@n5.nabble.com> 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>
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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. 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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