gjournal alignment on 4K sector advanced format drives

[Ivan Voras]

On 08/31/10 13:09, Carl wrote:

>
> Now I want to add gjournal to some of my partitions. It seems to me that
> I must also ensure the journal is aligned just as I've done with the
> data. So far, though, I have found no information as to how the
> journal's own filesystem layout works. Does it use fixed size
> blocks/fragments like the UFS2 data does? If so, what is its minimum
> addressable unit size? If it is smaller than 4KiB, we get journal
> misalignment and a performance loss, right? What must I do to ensure the
> journal is fully aligned?

gjournal writes its metadata throughout the journal in sector sizes (512 
bytes) so it cannot be aligned in this way.

For this you need a solution which will actually change the sector size, 
like gnop or my glabel patch.