![]() ![]() Much of this would require the disk to be locked to ensure data integrity. As a file grows in little chunks, VMFS will have to continually invoke metadata operations to allocate new resources on the VMFS. Copying files piece-by-piece results in a lot of metadata updates as the file grows. This post will try to explain why.Ĭopying files to VMFS is slower than NFS due to the metadata operational overheads. There have been variations of this behavior reported before. Both datastores were very healthy and fast, and both had running VMs on them. In fact, in one example, we had someone report that it took 10 minutes to upload a Windows 7 ISO to an iSCSI datastore and less than 1 minute to upload the same ISO to an NFS datastore. There seems to be some issue with uploading files to a VMFS datastore. This is something which has come up numerous times, and behavior which many of you have observed.
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