Anyone else have any experience with Hyper-V and how much overhead memory the host OS takes?
Was getting ready to migrate over to Hyper-V R2 but this afternoon I had a host machine just decide to reboot on me. Have one system with 8gb RAM and 6.5gb assigned out to VMs (SCVMM 2008 R2, KMS/WSUS, AD controller/DNS, and some misc stuff). All non-production so far, but had it all ready. The host is just Server Core 2008 R2 + Broadcom NIC drivers (teaming/tagging) + Dell OpenManage.
This morning the monitoring started going off that the system had <20mb physical ram free, but hadn't looked at it right away. Little while later, the system just reboots itself. The event log only shows a series of errors saying "An error was detected on device \Device\Harddisk0\DR0 during a paging operation" but the disk checks out just fine.
This has me a little shaky about Hyper-V, since I didn't think it would use so much overhead and kind of scary when it runs out of memory.
Anyone else seen this? Does it need more overhead? Fluke?
We haven't experienced any such issue with any of our Hyper-V hosts. From the error it appears that there was some issue with Hard drive during paging operation. Did you experience this on multiple hosts or is it a single host server where you are facing this issue? To be on safer side, we always keep around 1.5 - 2 GB RAM free for host systems.
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