Reducing I/O when increasing number of PGs

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Hi all,


I want to double the number of pgs available for a pool, however I
want to reduce as much as possible the resulting I/O storm (I have
quite a bit of data in these pools).

What is the best way of doing this? Is it using php_nums? for example:

increase pg_num form X to 2X
while pgp_num < pg_num:
  increase pgp_num by 10%
  wait for health_ok

Or is there a better way, like setting the number of simulataenous operations?

Cheers

Caius
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