linux-ext4 - Can anyone kindly tell me disadvantage of data=writeback if I save file length myself

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Date:	Thu, 12 Feb 2015 10:14:15 +0800
From:	Shiquan Yang <shiquany@...il.com>
To:	linux-ext4@...r.kernel.org
Subject: Can anyone kindly tell me disadvantage of data=writeback if I save
 file length myself

hi,

I have a case,
1. SATA disk + buffered write
2. one node with N disks, and the first disk is meta disk, and the left 1.N
is data disk
3. I will write data in disk 1-N, and record the chunk file length in meta
disk (disk0).

in such case, can I safely set data=writeback without any possible problem,
maybe include data corrupt, slow recovery when node restart, ... ?

thanks very much.
-- 
Raymond
Attitude is Everything.
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