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https://helpcenter.veeam.com/docs/mp/kb/h.esx.problem.vmfs.ats.support.lost.html
2019-8-13 · ATS (Atomic Test & Set) support has been lost for this VMFS volume. Causes. There is a storage configuration issue with this device. Review the event description for detail on the cause. Resolutions. Review storage configuration. Review VMware online documents such as vSphere Storage Guide to resolve issues. Externalhttps://helpcenter.veeam.com/docs/mp/kb/h.esx.problem.vmfs.ats.support.lost.html
http://www.virtualizationteam.com/server-virtualization/ats-only-vmfs-volume-vmfs5-not-mounted-host-does-not-support-ats-or-ats-initialization-has-failed.html
2020-1-21 · It is important to note though, this is not the case for upgraded VMFS Datastore. If you upgrade a datastore from VMFS 3 to VMFS 5 where the storage support ATS, your VMFS will be setup to use ATS as the preferred method, but revert back to SCSI reservations when ATS does not operate.www.virtualizationteam.com/server-virtualization/ats-only-vmfs-volume-vmfs5-not...
https://vmware-forum.de/viewtopic.php?t=29289
2012-1-3 · esx.problem.vmfs.ats.support.lost.formatOnHost not found. Beitrag von tozzy » 28.11.2013, 07:35 . Hallo zusammen, kann mir jemand vielleicht erklären was hier heute Nacht passiert ist? Kurz darauf hat sich der Host verabschiedet. Viele Grüße Christian. Nach oben. irixhttps://vmware-forum.de/viewtopic.php?t=29289
https://justvirtual.blog/2017/11/27/vmfs-locking-and-ats-miscompare-issues/
VMFS supports SCSI Reservations and Atomic Test and Set (ATS) locking. ATS. ATS is a lock mechanism designed to replace SCSI reservations. With the amount of SCSI reservation conflict issues on older versions of ESX/ESXi this was a much needed feature. ATS modifies only a disk sector on the VMFS volume whereas a SCSI reservation locks the whole ...https://justvirtual.blog/2017/11/27/vmfs-locking-and-ats-miscompare-issues
https://forum.huawei.com/enterprise/en/disabling-the-ats-heartbeat-in-the-esxi/thread/478269-891
2019-8-9 · Under certain circumstances, VMFS heartbeat using ATS may fail with false ATS miscompare which causes the ESXi kernel to again verify its access to VMFS datastores. This leads to the Lost access to datastore messages. Notes: For VMFS5 datastores, ATS heartbeat setting is on by default. For VMFS3 datastores, ATS heartbeat setting is off by default.https://forum.huawei.com/enterprise/en/disabling-the-ats-heartbeat-in-the-esxi/thread/...
https://pubs.vmware.com/vsphere-51/topic/com.vmware.vsphere.storage.doc/GUID-DE30AAE3-72ED-43BF-95B3-A2B885A713DB.html
In a shared storage environment, when multiple hosts access the same VMFS datastore, specific locking mechanisms are used. These locking mechanism prevent multiple hosts from concurrently writing to the metadata and ensure that no data corruption occurs. VMFS supports SCSI reservations and atomic test and set (ATS) locking.https://pubs.vmware.com/vsphere-51/topic/com...
https://blogs.vmware.com/vsphere/2012/05/vmfs-locking-uncovered.html
“VMFS-5 introduces support for very small files. For files less than or equal to 1KB, VMFS-5 uses the file descriptor location in the metadata for storage rather than file blocks.” Now I understand that VMFS-5 tries to use ATS natively but if it can’t it will fall-back to SCSI-2 reservations.https://blogs.vmware.com/vsphere/2012/05/vmfs-locking-uncovered.html
https://communities.vmware.com/thread/589197
2018-6-2 · Hi, I've lost a datastore. In my server, I have an SDD and 3 hard drives. Suddenly, one of the hard disks disappeared from the datastore. Unfortunately, I can not put it back up.https://communities.vmware.com/thread/589197
https://docs.vmware.com/en/VMware-vSphere/6.5/com.vmware.vsphere.storage.doc/GUID-7552DAD4-1809-4687-B46E-ED9BB42CE277.html
2019-9-27 · Several versions of the VMFS file system have been released since its introduction. ESXi supports VMFS3, VMFS5, and VMFS6.. For all VMFS version, ESXi offers complete read and write support. On all versions of VMFS, you can create and power on virtual machines.https://docs.vmware.com/en/VMware-vSphere/6.5/com...
https://blogs.vmware.com/virtualblocks/2015/02/19/vsphere-virtual-volumes-interoperability-vaai-apis-vs-vvols/
vSphere Virtual Volumes Interoperability: VAAI APIs vs vVols. Rawlinson Rivera posted February 19, ... ATS – All config vVols objects that are stored in a Block vVols datastore are formatted with VMFS and hence require supporting ATS commands. This support is detected based on ATS support for a PE LUN to which vVols are bound.https://blogs.vmware.com/.../vsphere-virtual-volumes-interoperability-vaai-apis-vs-vvols
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