Journaled file system on FreeBSD

[TerryP]

Am I the only one who does not like doing that? Seems a bit of work, why not just use ext3.

[antik]

Am I the only one who does not like doing that? Seems a bit of work, why not just use ext3.

ext3 is pseudojournaled filesystem, just like ufs2+softupdates.
But with gjournal it is possible even use journaling features with old filesystem like FAT32.... :twisted:

[TerryP]

Hmm, I see your point.

[antik]

So, I tested what is journaling and how to use this feature:

Code:

# swapoff /dev/ad0s2b # umount /dev/ad0s4 # gjournal label ad0s4 ad0s2b # mount -o async,gjournal /dev/ad0s4.journal /mnt/ad0s4 # df -h /dev/ad0s4.journal 56G 24G 27G 47% /mnt/ad0s4 # mount /dev/ad0s4.journal on /mnt/ad0s4 (ufs, asynchronous, local, gjournal)

Read speed is indeed better than standard ufs but writing is slower for about 10%. But I have to backup all files from ad0s4 and restore my swap usage then I can permanently prepare ad0s4 for journaling:

add geom_journal_load="YES" into /boot/loader.conf

Code:

# reboot # gjournal label /dev/ad0s4 # newfs /dev/ad0s4.journal

You can use journaling even to existing filesystems.

umount /dev/ad0s4
gjournal label /dev/ad0s4
mount -o async,gjournal /dev/ad0s4.journal /mnt/ad0s4

# mount
/dev/ad0s4.journal on /mnt/ad0s4 (ufs, asynchronous, local, gjournal)

Enable journaling on bootup:
add geom_journal_load="YES" into /boot/loader.conf

Change line in /etc/fstab:

/dev/ad0s4      /mnt/ad0s4              auto    rw,noauto       0       0

to

/dev/ad0s4.journal      /mnt/ad0s4              ufs    rw,async,gjournal       2       2

[DragnLord]

since PC-BSD scripts change fstab on boot, maybe you could post a revised script for people using gjournal (hopefully this makes default, huge boost in desktop usability)

[antik]

since PC-BSD scripts change fstab on boot, maybe you could post a revised script for people using gjournal (hopefully this makes default, huge boost in desktop usability)

Great bsdtalk interview with Pawel Jakub Dawidek about gjournaling and other projects.

[PCdoc]

that's a cool trick antik

# dd if=/dev/zero of=/0bits bs=20971520   # bs=20m 
# rm /0bits

+ghost = smaller images

is there anything like ghost that can image pcbsd's partitions and just save the good stuff, so it can be laid down on a partition that is not the same size??

[rodonn]

Now that's a strange thing... I was wondering if there was a Ghost clone for PC-PSD this morning (about 5am, as you do...)

[antik]

Now that's a strange thing... I was wondering if there was a Ghost clone for PC-PSD this morning (about 5am, as you do...)

Ghost4Unix.

[rodonn]

<Mr Burns>
Excellent!
</Mr Burns>