Perhaps it will help future sysadmins will learn from my mistake.
I also saw very poor upload speeds (~30MB/s)
no matter what I tried. I went through the whole route with unix-
sockets and whatnot.
But, in the end, it just turned out that the glusterfs itself was the
bottleneck; abysmal performance for small block sizes.
I found the list of suggested performance tweaks that RHEL suggests.
In particular, it was the "network.remote-dio=on" setting that made
all the difference. Almost 10x faster.
https://access.redhat.com/documentation/en-us/red_hat_gluster_storage
/3.1/html/configuring_red_hat_enterprise_virtualization_with_red_hat_
gluster_storage/chap-
hosting_virtual_machine_images_on_red_hat_storage_volumes
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