Does anyone know of any ways to speed up the resync or rebuild process for VSAN?
I remember reading that VSAN throttled resync I/O by default so it doesn't impact the datastore as much. However if that is not an issue for me, I would like to know if there are any advanced commands or parameters that would increase the rate of resync. I have some maintenance operations that triggered 40TB of resync and I was thinking if there was a way to increase the resync rate during weekends/offhours.
My understanding is that it will only throttle if it needs too. Otherwise it will use all available resources. If the rebuild seems slow, and your not pushing your hardware; the bottleneck is probably the vSAN software "figuring" stuff out. Thank you, Zach.
Quote from Duncan: On top of that, VSAN also has a “rebuild throttling / QoS” mechanism, which will throttle back replication traffic during rebuild when this can impact virtual machine performance.
I'm fairly certain I saw a process for changing this (Can't seem to find it at the moment). My advise (Much like my recommendations on adjusting cache reservation) is if it actually causes a problem please call support first. If rebuilds are causing a problem you may have other issues (like a bad NIC firmware was something I caught because of a slow rebuild).