[Nottingham] EXT4 no journal

[Rory Holland]

ahaaa. I looked at the manpage ant it said about -O, but didn't
mention any filesystem-specific options. What other ext4 options are
there to play with?

2009/10/13 Martin <martin at ml1.co.uk>:
> Sergiusz Pawlowicz wrote:
>> On Tue, Oct 13, 2009 at 10:00, Rory Holland
>> <modestforagenius at googlemail.com> wrote:
>>> I have a netbook wth an SSD, and have heard that running a journaled
>>> filesystem can severely impact the lifetime (and performance for this
>>> one!) of the drive.
>
> The opinion from Theodore Ts'o is that a journal is no problem for an
> SSD. The additional writes are not significant.
>
> See:
>
> http://thunk.org/tytso/blog/2009/03/01/ssds-journaling-and-noatimerelatime/
>
>
>>> However, I know ext4 brings many performance improvements over ext2,
>>> so I would like to know if there's a way to disable the journal on an
>>> ext4 partition. Google isn't much help, as there's lots of conflicting
>>> information.
>
> Google use that feature and are the driving force for it's use. They do
> all their data replication at the /application/ level. 'Extras' for
> filesystem security/integrity are just a slowdown for them.
>
>
>>> I think there's a way using a livecd and the "tune2fs" tool.
>
> Check out the man page:
>
> -O ^has_journal
>
> but specify all the other ext4 features that you want. See what you get!
> Let us know.
>
>
>> i am not sure if these patches are incorporated to mainstream kernel:
>>
>> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=0390131ba84fd3f726f9e24fc4553828125700bb
>>
>> but probably you can have a look at them.
>
> Good find. That's long enough ago and with positive enough comments that
> it may well be in present kernels.
>
> So... How do you check what is mainstream or not?
>
>
> Cheers,
> Martin
>
> --
> ----------------
> Martin Lomas
> martin at ml1.co.uk
> ----------------
>
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