When testing our SMB storage with large I/Os I found that vDisk read performance could be increased quite a bit (1 Gbit/s -> 3 Gbit/s with 32+ MB buffers, measured simply with dd inside a guest).
In order to decrease our backup window I was looking for increasing SAN read buffers for the backup proxy and all I could find was an ancient thread
. The mentioned registry value VddkPreReadBufferSize
doesn't seem to do anything.
Listening in to VeeamAgent.exe with ProcessMonitor revealed the value VmfsSanPreReadBufSize
which does change VMFS SAN PREREAD BUFFER SIZE
according to the log. Is this what I'm looking for? Is there any documentation for those registry options?
(In case you're interested: we're using a Dell MD3220i iSCSI array with 4x Gigabit to each host.)