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
_______________________________________________
freebsd-stable@freebsd.org mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-stable
To unsubscribe, send any mail to "freebsd-stable-unsubscr...@freebsd.org"
