[Gluster-users] New 3.7.13 settings

[Lindsay Mathieson]

3.7.13 has been running well now for several weeks for me on a rep 3 
sharded volume, VM hosting, but I'm still on op-version 30710, after the 
issues with 12 have held off making any changes until confidence was 
restored :)


Scrolling through the code revealed the following for 3.7.13


*cluster.shd-max-threads*
Default Value: 1
Description: Maximum number of threads SHD can use per local brick.  
This can substantially lower heal times, but can also crush your bricks 
if you don't have the storage hardware to support this.

*cluster.shd-wait-qlength*
Default Value: 1024
Description: This option can be used to control number of heals that can 
wait in SHD per subvolume

*cluster.locking-scheme*
Default Value: full
Description: If this option is set to granular, self-heal will stop 
being compatible with afr-v1, which helps afr be more granular while 
self-healing

The first two are I believe, to do with improving heal performance. 
However I'm quite happy with the existing defaults and performance, so 
no need to tweak them.


But I'm not sure as setting cluster.locking-scheme to"granular" will 
achieve - I seem to recall that it reduces the locks needs to establish 
whats needs to be healed? improves speed of "heal info"?


thanks,


-- 
Lindsay Mathieson

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