FAQ request

[mmoya]

I was reading the 1.0 release note in LWN and someone commented about the risk of ending with "poor layout" because of continuous growing (link).

The OP cited an answer from Eric Sandeen. Can something like "Will Stratis layout degrade in face of several size increases?" be added to the FAQ with a proper official answer?

Thanks

[agrover]

Thanks, will do.

[trgill]

Adding some info from my notes etc...

with a virtual size of 1T - we get:

32 allocation groups
dmthinp is setting alignment parameters
XFS reduced the AG size from 8388608 blocks down to align them

When I initially talked to Eric about optimal initial size - the advice was: "don't grow by 3 orders of
magnitude, more or less"

We may want to consider adding an optional parameter to let the user set the initial virtual size - that would allow XFS to pick better number of allocation groups.