Poor guest performance Server 2012 w/ iSCSI
i'm not sure if better suited question plain old server 2012 forums, feel free move topic moderators.
quick story on our infrastructure. have been building our own servers past couple of years serve private cloud foundation using scvmm 2012 our engineers can build out , deploy vms needed without having ask them. has been working great until when decided use server 2012 after recent release of scvmm sp1 instead of 2008 r2 on our latest build.
all 4 machines identical other operating system, 3 of using 2008 r2 enterprise , recent 2012 standard. 2 of these boxes running 4x2tb locally in raid10, 1 of them using microsoft iscsi initiator microsoft iscsi target setup has 8tb lun , latest server 2012 using iscsi initiator storage house vhds , vm config files.
the server 2008 r2 box has 24 vms running iscsi disk reporting highest active time of 30%. vms work seamlessly , i've had no complaints.
server 2012 box has 12 vms running iscsi disk jumping between highest active time of 10% , 100% , of course when spikes 100% vms become incredibly slow , non-responsive. of course i'm getting complaints left , right.
the nic configuration on hosts identical since motherboards same nics same. i'm trying figure out why io terrible in 2012 works fine in 2008 r2.
i'd suggest use vlans , assign subset of bandwidth management , vm traffic leaving as can iscsi configured mpio & round robin. such setup pay sure!
intel gbe nics dirt cheap these days i'd recommend replace broken bc 1 (i'm not big fan of bc either btw) instead of trying fix it. jumbo must enabled both tcp , iscsi doing wire speed on gbe connections.
Windows Server > Hyper-V
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