I am talking about latency after the svMotion is complete, which results in the guest VM becoming essentially unusable. Note, I am not talking about latency observed during the svMotion, which is expected. Upgrading VMware tools / Windows OS does not have any effect.Īs stated above, the issue is only apparent after performing a storage vMotion from VMFS6 to vVol, or vVol to VMFS6.If we disable unmap on the VMFS6 datastore, the issue does not occur after svMotion from vVol to VMFS6.If we disable unmap from the Windows OS (fsutil behavior set DisableDeleteNotify 1), the issue does not occur.Latency is not seen on esxtop from datastore view "u" or VM view "v".Latency appears from inside Windows Guest Operating system only after performing a storage vMotion from vVol to VMFS6 or vice versa.The disk latency remains at 500ms until the guest is rebooted. There appears to be a bug in the unmap code in ESXi (6.7U2+) which causes disk I/O latency in Windows Server VMs to reach over 500ms. Posting this to the community as there seems to be little information publically available regarding the issue we're experiencing and I think it's important to raise awareness. Please message the moderators and we'll pull it back in. If you make a post and then can't find it, it might have been snatched away. The spam filter can get a bit ahead of itself. To get flair with your certification level send a picture of your certificate with your Reddit username in the picture to the moderators. If you are an employee, please PM one of the moderators that has a VMware logo for verification instructions and we will add it to yours as well! The VMware logo icon following a username indicates that this user is a VMware employee. Specify your problems/needs, technical requirements, and objectives clearly. When asking for assistance or advice, please give the community sufficient information to work with. When asking for technical support, please specify the specific VMware product(s) and version(s) you are working with. While discussion of virtualization concepts in general is appropriate, requesting technical help for non-VMware products is off-topic. Posts that fail to meet these guidelines may be locked or removed: Vulgarity and hostility towards other users will not be tolerated.ĭon't post brain dumps for certification exams. Want to promote something within the community? Message the mods first with your proposal, and we'll decide if it's too spammy or not.ĭon't be a jerk. Brazen marketing material is also generally unwelcome. within a short period of time will be considered spam. Repeatedly submitting links to the same blog/YouTube channel/etc. Don't submit links to blogspam or other low-quality content. Spammers will be banned this sub will not become a marketing cesspit for vendors. Off-topic posts may be locked or removed. Keep post submissions relevant to VMware. Support requests involving Mac OS on unsupported hardware (not a Mac) or software (VMware Workstation or VMware Player) will be removed, and will result in a ban. This includes discussion of 'unlocker' or other methods used to violate the Mac OS EULA by running Mac OS on non-Apple hardware. Expect posts facilitating or promoting piracy to be removed. Have a technical question? Just make a self post!ĭiscussion of piracy methods will not be permitted.
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