Plans for Logged/Journaled UFS

[David N]

2009/12/22 Pedro F. Giffuni <giffunip at tutopia.com>:
> ----- Original Message ----
>
>>
>> On Dec 20, 2009, at 8:37 PM, Pedro F. Giffuni wrote:
>>
>> > Just wondering...
>> >
>> > What's wrong with gjournal(8) ?
>> >
> ...
>>
>> gjournal(8) journals everything, that is all data and metadata are journaled.
>> Which can help with random writes, but essentially cuts linear write throughput
>> in half.
>>
>> Regards,
>> Niki Denev
>
>
> I recall ext3fs also journals everything by default and still is very popular.
>
> I am asking because I've been playing a bit with Aditya's ext2fs (mostly UFS1)
> and one of the ideas there is adding gjournal support instead of starting from
> scratch.
>
> Pedro..
>
>
>
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Hi,

Ext3 by default only journals the meta-data
http://en.wikipedia.org/wiki/Ext3

>From http://wiki.archlinux.org/index.php/Ext3_Filesystem_Tips
"By default, ext3 partitions mount with the 'ordered' data mode. In
this mode, all data is written to the main filesystem and its metadata
is committed to the journal, whose blocks are logically grouped into
transactions to decrease disk I/O"

You have to enable full journalling by setting the option in fstab to
journal everything.

Regards
David N