linux-kernel - Re: Debugging system freezes on filesystem writes

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Date:	Sun, 15 Sep 2013 22:19:41 +0300
From:	Marcus Sundman <marcus@...ox.fi>
To:	Theodore Ts'o <tytso@....edu>, Jan Kara <jack@...e.cz>,
	Dave Chinner <david@...morbit.com>,
	linux-kernel@...r.kernel.org
Subject: Re: Debugging system freezes on filesystem writes

On 14.09.2013 05:41, Theodore Ts'o wrote:
> On Thu, Sep 12, 2013 at 08:59:07PM +0300, Marcus Sundman wrote:
>> At 128 GB it is extremely small as it is, and I'm really struggling
>> to fit all on it. Most of my stuff is on my NAS (which has almost 10
>> TB space), but still I need several code repositories and the
>> development environment and a virtual machine etc on this tiny 128
>> GB thing.
>>
>> So, if I used some other filesystem, might that allow me to use a
>> larger portion of the SSD without this degradation? Or with a much
>> slower rate of degradation?
> What model are you using?  It's possible that your flash device was
> designed as a cache driver for windows.  As such, it might have been
> optimized for a read-mostly workload and not something for a lot of
> random small writes.

It's a SanDisk SSD U100.

> The f2fs file system is designed for crappy flash drives with crappy
> FTL's, so it might work be better for you.

OK, I'll probably try it when I have time to switch.

> But let me ask you this
> --- how much is your data worth?  How much would it cost to replace
> your flash device with something better?

A lot. I have lsyncd running here most of the time, backing up to my 
raid-z NAS which in turn uses a versioned off-site backup system.
Anyway, this is an Asus ZenBook computer and can't be opened. Well, it 
can, but that will void the warranty at the very least.


- Marcus

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