{"id":172,"date":"2014-09-30T07:21:48","date_gmt":"2014-09-30T14:21:48","guid":{"rendered":"https:\/\/45.77.187.106\/?p=172"},"modified":"2015-03-07T22:05:46","modified_gmt":"2015-03-08T06:05:46","slug":"windows-2012-e1000-cause-data-corruption","status":"publish","type":"post","link":"https:\/\/mindthevirt.com\/windows-2012-e1000-cause-data-corruption\/","title":{"rendered":"Windows 2012 with e1000e could cause data corruption"},"content":{"rendered":"

A couple of days ago,\u00a0I spent two hours setting up two Windows Server 2012 VMs on my ESXi 5.1 cluster and tried to get some performance tests done.\u00a0When copying multiple ISOs across the network between those two VMs, I received an error that neither of my 5 ISOs could be opened on the destination.<\/p>\n

After checking the settings of my VMs, I saw that I used the default e1000e vNICs.\u00a0Apparently, this is a known issue with Windows Server 2012 VMs using e1000e vNICs, running on top of VMware ESXi 5.0 and 5.1.<\/p>\n

The scary part is,\u00a0the e1000e vNIC is the default vNIC\u00a0by VMware when creating a new VM. This means, if you don’t carefully select the correct vNIC \u00a0type when creating your VM, you could potentially run into the data corruption issue.
\nThe easiest workaround is to change the vNIC type from e1000e to e1000 or VMXNET3. However, if you use DHCP, your VM will get a new IP assigned as the DHCP server will recognize the new NIC.<\/p>\n

If you prefer not to change the vNIC type, you might just want to disable TCP segmentation offload on the Windows 2012 VMs.
\nThere are three settings which should be changed:<\/p>\n

IPv4 Checksum Offload<\/strong><\/p>\n

\"IPv4_Checksum_Offload\"<\/a><\/p>\n

 <\/p>\n

Large Send Offload (IPv4)<\/strong><\/p>\n

\"Large_Send_Offload_IPv4\"<\/a><\/p>\n

 <\/p>\n

TCP Checksum Offload (IPv4)<\/strong><\/p>\n

\"TCP_Checksum_Offload\"<\/a><\/p>\n

 <\/p>\n

Further details can be found in VMware KBA 2058692<\/a>.<\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

A couple of days ago,\u00a0I spent two hours setting up two Windows Server 2012 VMs on my ESXi 5.1 cluster and tried to get some performance tests done.\u00a0When copying multiple…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"footnotes":"","_jetpack_memberships_contains_paid_content":false,"jetpack_publicize_message":"#VMware ESXi 5.1, Server 2012 and #E1000E vNICs are not a great combo! Read how to avoid data #datacorruption http:\/\/wp.me\/p4LPqN-2M","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","enabled":false}}},"categories":[153,154],"tags":[67,16,66,65,68],"jetpack_publicize_connections":[],"yoast_head":"\nWindows 2012 with e1000e could cause data corruption<\/title>\n<meta name=\"description\" content=\"When running a Windows Server 2012 VM with a E1000E vNIC, you might face data corruption. 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