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Re: [PATCH 2/4] Use Ext4FS for all extended filesystems.



On 9/6/11 5:10 PM, John Reiser wrote:
> On 09/02/2011 12:01 PM, David Lehman wrote:
>> I should point out that this will have some other consequences. First,
>> we will no longer offer to create new ext2 or ext3 filesystems. (In
>> fact, specifying ext2 or 3 via kickstart will lead to us making you an
>> ext4 fs.)
> 
> For faster installs I specify ext2 because it has no journal.
> (I convert later to ext3.)  If ext2 and ext3 are going away,
> then please add the option to create ext4 _with_ journal,
> but turn off journalling for the rest of the install.
> 
> As long as an install cannot be resumed "in the middle", then
> the journal's advantage of easy recovery after an interruption
> (failure of power, network, drive/media, etc.) does not pay off
> in practice.

The only real way to do this would be to tune2fs the journal
off, and then tune2fs it on again when done.  And I think you
may not end up with an ideally-placed journal if you do that -
and possibly even a fragmented one.  So I'm not sure I'd really
recommend it.

I hesitate to even suggest this, but:

Running the install with barriers off would speed things up too,
for what it's worth, and that's just a mount option.
As long as you're willing to accept damage if you lose power halfway
through.  IOW, it should only be for a fresh install, and never for
an upgrade...

-Eric


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