Actually, that does NOT match my understanding.  And does not match what a filer with a multi-rg aggr shows me.

Stripes do appear to be related only to raidgroup size, NOT to total aggr size.  Stripes are what needs to be calculated in order to write parity.  And parity is a rg-level concept, not an aggr-level one.

I have a filer one one aggr being 1*(8+2) + 1*(9+2).  And another aggr being 1*(14+2). (And a small root aggr.)

If I run statit, and look at the stripe data near the top, this is what is output:
      5.18 1 blocks per stripe size 1       24.65 1 blocks per stripe size 8
     15.32 2 blocks per stripe size 8       13.64 3 blocks per stripe size 8
      9.63 4 blocks per stripe size 8        7.73 5 blocks per stripe size 8
      5.62 6 blocks per stripe size 8        2.41 7 blocks per stripe size 8
      0.58 8 blocks per stripe size 8       27.13 1 blocks per stripe size 9
     22.83 2 blocks per stripe size 9       16.56 3 blocks per stripe size 9
     12.98 4 blocks per stripe size 9        9.55 5 blocks per stripe size 9
      5.32 6 blocks per stripe size 9        3.72 7 blocks per stripe size 9
      0.80 8 blocks per stripe size 9        0.66 9 blocks per stripe size 9
      3.14 1 blocks per stripe size 14       2.19 2 blocks per stripe size 14
      3.87 3 blocks per stripe size 14       3.43 4 blocks per stripe size 14
      3.57 5 blocks per stripe size 14       3.43 6 blocks per stripe size 14
      3.87 7 blocks per stripe size 14       2.63 8 blocks per stripe size 14
      3.28 9 blocks per stripe size 14       3.06 10 blocks per stripe size 14
      5.25 11 blocks per stripe size 14      4.74 12 blocks per stripe size 14
      6.27 13 blocks per stripe size 14      5.03 14 blocks per stripe size 14

Note that the largest stripe shown is 14, from the 14+2 raidgroup.  And it shows stripes of size 8 and size 9, from the 8+2 and 9+2 raidgroups.   But there is no sign of a stripe that is size 17, or any other combination of the two raidgroups in the larger aggr.


Davin.