Valid on Windows platforms.
Symptom
Multiple concurrent backup jobs fail in NBD (or LAN) transport mode. The following message appears in the Activity Log:
Cannot open VMDK File
Solution
This is a VMware connection limitation. The following Network File Copy (NFC) protocol limits apply:
|
Host Platform |
Connecting to |
Limits to |
|---|---|---|
|
vSphere 4 |
an ESX host |
9 connections directly and 27 connections through vCenter server |
|
vSphere 4 |
an ESXi host |
11 connections directly and 23 connections through vCenter Server |
|
vSphere 5 and 6 |
an ESXi host |
Limited by a transfer buffer for all NFC connections enforced by the host: the sum of all NFC connection buffers to an ESXi host cannot exceed 32MB. 52 connections through vCenter server, including the above per-host limit. |
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Connections cannot be shared across disks. The maximum limits do not apply to SAN or hotadd connections. If the NFC client fails to shut down properly, connections can remain open for ten minutes.
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