The blocksize should be equal or bigger then the blocking device.
Otherwise you risk writing multiple blocks 512 for 1 1k sector, resulting in read-modify-write transaction on 4k disks.

But for some reason I didn't do this on my desktop.
(I might need to reformat if i'm right about this :( )


Killian De Volder
On 18-05-16 07:50, Vlad wrote:

Hallo,

What would be the optimal block size in case if physical block sizes
different for cache and backing devices? Can I use different block sizes
for cache and backing devices, like:
make-bcache --block 4k -B /dev/sdc
make-bcache --block 512 -C /dev/sda

I have a feeling that the block size should be the same and the biggest
block size should be used, but I'd appreciate any thoughts about that.

Thanks in advance,
Vlad.
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