Hi Michael,

> I can't see why adjusting the default partition size would have been necessary
> as genext2fs takes (or better: took) the following parameters:

The filesystem is generated okay but due to the total size : blocksize ratio 
there are not enough backup block group descriptor entries left to support 
online-resizing the rootfs partition, see 
http://lists.infradead.org/pipermail/lede-dev/2016-September/002518.html for a 
report that describes the problem.

I am fine with keeping 4k blocks but in this case we should increase the 
default image size to at least the minimum value being able to support 
resizing. The report mentions that 512M already work which would allow resizing 
up to 512GB (1024 times larger).

> Sorry, but I can only find the default value of 48 MB? Do I miss something?


> I don't like reverting to 1k because when you use the image on a real
> device, e.g. eMMC or SD card, then usually the internal blocksize is 4k,
> and internal erase block size is often even 4 MiB.
> Thus using 1k blocksize is not optimal when using a writeable filesystem.

I understand. As mentioned above, 4K blocks are fine for me too, but in this 
case I suggest to bump the rootfs part size to 2GB which would support 2TB 
rootfs partitions.

~ Jo

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