This is a scenario I saw today when I configured a pair of virtual machines with Dynamic Memory and used up all available RAM.\u00a0 The Hyper-V parent partition locked up and became non responsive.\u00a0 The VM\u2019s were fine; they continued working away.<\/p>\n
The fault as I found, was mine, and mine alone.\u00a0 Virtual Machines with Dynamic Memory enabled could consume all memory on the host, leaving nothing for the parent partition.\u00a0 That\u2019s why we have a new registry key:<\/p>\n
You must reboot the host after setting this registry value.\u00a0 I forgot to do this and the setting did not become effective.<\/p>\n
My host has 8GB RAM.\u00a0 Both VM\u2019s were configured with 512-4096MB RAM.\u00a0 The parent was using around 1.5GB.\u00a0 You can do the maths: 4096 + 4096 + 1536 > 8192.\u00a0 Every byte of RAM appeared to be consumed when I pushed the VMs to their achievable maximum.\u00a0 The parent partition was locked up because it had no RAM to do anything.\u00a0 The only recourse was to do a hard reset.<\/p>\n
BTW, the tool I used to force the VMs to consume memory was consume.exe from the Windows SDK.\u00a0 It\u2019s a free download.<\/p>\n
EDIT #1<\/em><\/p>\n Just to repeat: the problem was caused by my mistake.\u00a0 I should have rebooted after setting the registry value.\u00a0 And thanks to Serdar who has patiently answered a whole bunch of questions.<\/p>\n This is a scenario I saw today when I configured a pair of virtual machines with Dynamic Memory and used up all available RAM.\u00a0 The Hyper-V parent partition locked up and became non responsive.\u00a0 The VM\u2019s were fine; they continued working away. The fault as I found, was mine, and mine alone.\u00a0 Virtual Machines with … Continue reading “Hyper-V Host Freezes When Dynamic Memory VM\u2019s Use All RAM”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"_wpcom_ai_launchpad_first_post":false,"footnotes":""},"categories":[20],"tags":[181,195,117],"class_list":["post-10822","post","type-post","status-publish","format-standard","hentry","category-hyper-v","tag-hyper-v","tag-virtualisation","tag-windows-server-2008-r2"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t