SDS slower than the rest, after reboot re-build/re-balance finishes

Hello,

We are running the following environment with the latest SCALEIO version

Exact same hardware all 4 nodes, same BIOS, FW, and drivers

Node 1

Baremetal Centos 7

MDM01

SDS01

2 x SSDs dedicated to SDS

Node 2

Baremetal Centos 7

MDM02

SDS02

2 x SSDs dedicated to SDS

Node 3

Baremetal Centos 7

TB01

SDS03

2 x SSDs dedicated to SDS

Node 4

Baremetal Windows 2012 R2 Standard

SDS04

2 x SSDs dedicated to SDS

SDC mapping a shared volume from the ScaleIO SSD pool

We enable a long running workload on the shared ScaleIO volume

We reboot any SDS

The SDS comes back up, it finishes the re-build/re-balance but performance on THAT SDS is reduced by 50% approximately

No mater what SDS, or the order of reboot, the slowness follows the SDS being rebooted

In the image attached you can see Node 2 SDS being slower than the rest of the SDSs, that behavior after the reboot.

We applied the ScaleIO performance tuning guide recommendations to all 4 nodes

What can be causing this, what other things should we look at?

Were you able to reproduce this?

Thank you!