linux-ext4 - Re: ext4 online resize and robustness to interruption

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Date:	Tue, 3 Apr 2012 18:58:29 +0800
From:	Yongqiang Yang <xiaoqiangnk@...il.com>
To:	Daniel Drake <dsd@...top.org>
Cc:	Ext4 Developers List <linux-ext4@...r.kernel.org>,
	Andreas Dilger <adilger@...ger.ca>
Subject: Re: ext4 online resize and robustness to interruption

On Mon, Apr 2, 2012 at 11:17 PM, Daniel Drake <dsd@...top.org> wrote:
> Hi,
>
> I think this question has been asked before, but I'd like to revisit
> it given the recent rework of ext4 online resizing:
>
> How robust is ext4 online resize in the face of unexpected
> interruption (i.e. sudden loss of power)?
Yep!  It is only robust when journal is used.  In no journal mode, it is not.

Yongqiang.
>
> The context here is that OLPC will now performing an online resize
> upon first boot of the system. Our laptops are frequently used in very
> remote places with unreliable power, and given that we work in large
> numbers, we're going to see some cases where the system lost power
> during the resize operation. What is the expected effect here - will
> the system boot up again just fine (perhaps with the original
> partition size), and is then repeating the resize operation expected
> to be safe and reliable?
>
> Thanks,
> Daniel



-- 
Best Wishes
Yongqiang Yang
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