linux-ext4 - Re: Ext4 documentation

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Message-ID: <6149e97b0812221911l397556dau64b7f5935cf9411f@mail.gmail.com>
Date:	Tue, 23 Dec 2008 11:11:56 +0800
From:	"Peng tao" <bergwolf@...il.com>
To:	"Diego Calleja" <diegocg@...il.com>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: Ext4 documentation

Hi, Diego

Thanks for your efforts.

About migrating from ext3 to ext4, you suggested the following:
tune2fs -O extents,uninit_bg,flex_bg,dir_index /dev/yourfilesystem

Tuning on flex_bg isn't supported yet. tune2fs doesn't really do the
magic you want. It just sets the incompatible feature bit in super
block and nothing else. An e2fsck after that won't modify the ondisk
format either. e2fsck doesn't check log_groups_per_flex right
now(might be a bug if superblock corrupts?).

So even if you turn on flex_bg, fs doesn't benefit from flex_bg feature.

On Tue, Dec 23, 2008 at 6:58 AM, Diego Calleja <diegocg@...il.com> wrote:
> Due to the astounding lack of good end-user documentation about Ext4, I've
> taken the freedom of writing an article about it for the kernelnewbies
> 2.6.28 changelog: http://kernelnewbies.org/Ext4
>
> If you find any error or you have some suggestion, just tell me and I'll
> fix it.
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-- 
Cheers,

Bergwolf

................
Margaret Mead  - "Always remember that you are absolutely unique. Just
like everyone else."
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