On 10/07/2017 01:21 AM, Eric Sandeen wrote:
On 10/6/17 5:20 PM, Dave Chinner wrote:
On Fri, Oct 06, 2017 at 11:18:39AM -0500, Eric Sandeen wrote:
On 10/6/17 10:38 AM, Darrick J. Wong wrote:
On Fri, Oct 06, 2017 at 10:46:20AM +0200, Gandalf Corvotempesta wrote:
Semirelated question: for a solid state disk on a machine with high CPU
counts do we prefer agcount == cpucount to take advantage of the
high(er) iops and lack of seek time to increase parallelism?
(Not that I've studied that in depth.)
Interesting question. :) Maybe harder to answer for SSD black boxes?
Easy: switch to multidisk mode if /sys/block/<dev>/queue/rotational
is zero after doing all the other checks. Then SSDs will get larger
AG counts automatically.
The "hard part" was knowing just how much parallelism is actually inside
the black box.
It's often > 100.
But "multidisk mode" doesn't go too overboard, so yeah
that's probably fine.
Is there a penalty associated with having too many allocation groups?
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