Re: Does nilfs2 do any in-place writes?

["Mark Trumpold" <markt-qk0wvQ0ghJwAvxtiuMwx3w@public.gmane.org>]

> -----Original Message-----
> From: linux-nilfs-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org [mailto:linux-nilfs-
> owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org] On Behalf Of Clemens Eisserer
> Sent: Thursday, January 16, 2014 10:42 AM
> To: linux-nilfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
> Subject: [PossibleSpam] Re: Does nilfs2 do any in-place writes?
>
> Hi Mark,
>
> > I am wondering what the impact of in-place writes of the
> > superblock has on SSDs in terms of wear?
>
> Typically SSDs have far more advanved static wear leveling algorithms
> which keep the erease count for each erease block as well as a
> sophisticated mapping table. Otherwise e.g. journaling file systems
> would probably kill it quickly.
>
> Regards, Clemens
> --

Hi Clemens,

Thank you for the info.  That was my prior understanding; however
I thought it curious that the SSD failure sited nilfs trying to access
the superblock which had failed at the media level.

It was a fairly high end SSD with TRIM, etc (Corsair Force 240GB).
Working with the vendor to analyze further..

Thanks again,
Mark T. 



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