November 28, 201510 yr I recently migrated my server from a dedicated server into my desktop pc. My setup is intel i5 4670 (soon to replaced with a 4790k this week msi h87-g43 motherboard (will be replaced by asus z97) 4 3tb seagate drives one parity 1 1tb wd 3 ssds 250gb each 1 syba 4 port sata 3 card 1x speed ssds are attached to onboard sata gtx 760 2gb passed through 16 gigs of ram my vm image is on my cache only i have 3 cores and 8 gigs of ram given to this desktop. its spiking to 100% disk usage and only speeds around 1 mb/s but ive seen it hit 80 mb/s as well. Its not lagging like it was with my earlier install but im wondering why im still seeing high disk usage.
November 28, 201510 yr Even on physical Windows install you could see this behavior. Look at the post install tuning guide on the wiki under VM guest support. Some tips there.
December 1, 201510 yr Just to 2nd what jonp said - I've seen this on a W10 laptop, desktop, and my current build physical & virtualized. Only the desktop was suffering noticeable performance issues, and it was older hardware with a technical preview build of W10. One explanation was that windows is reporting %time active, not %throughput. No idea if this is technically correct. After disabling MS One Drive and allowing W10 to download drivers, updates, and reboot, my current virtualized W10 calmed right down.
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