[Gluster-devel] Architecture advice

[Gordan Bobic]

Daniel Maher wrote:
> Basavanagowda Kanur wrote:
> 
>>     I am curious to know how the client decides which of the subvols to
>>     use at any given time, and if there is a way to specify a
>>     "preferred" subvol.  For example, i have two servers AFR'ing each
>>     other.  I have two clients set up to access the AFR cluster via HA.
>>      For reasons of resource distribution, i would like Client01 to
>>     prefer to use Server01, and Client02 to prefer to use Server02.
>>
>>
>> currently HA does not provide facility for specifying this option.
> 
> How does the HA translator choose a node, exactly ?  Does it randomly 
> select one from the list of available subvolumes, or does it pick them 
> in the order they're specified in the config file, or some other way 
> entirely ?

Not sure what the default is, but you can specify a preferred read 
server (writes have to go to all servers regardless) with
"option read-subvolume" in the volume spec.

Gordan