Re: A big issue of NAND fragmentation

[Richard Weinberger <richard.weinberger@xxxxxxxxx>]

On Thu, Sep 5, 2019 at 3:27 AM JH <jupiter.hce@xxxxxxxxx> wrote:
>
> Hi,
>
> I am running kernel 5.1.0 on iMX6 using NAND flash, I write small data
> files about 250 bytes each every 5 minutes to a backup storage, the
> total size of all data files is about 600 KB, but du shown me 9.7M is
> used in that directory. I know NAND using page to flush files, how
> does the MTD handler NAND fragmentation?

If you force UBIFS (I assume you use it) to persist 250 bytes,
it has to waste a full NAND page. This is how NAND works.
But UBIFS can pack such data chunks upon garbage collect when
it runs out of space.

-- 
Thanks,
//richard

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