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The primary source for macOS tuning remains the macOS performance guide located here: PowerScale OneFS: macOS Performance Optimization
The performance guidance in that document is of extra importance when running Resolve, which has high-performance requirements. For working with directories containing large image sequences, disabling the Apple Extensions in OneFS and .DS_Store files in macOS can make consequential improvements in performance.
Increasing SMB credits in OneFS makes a substantial difference in write performance when rendering video or image sequences. With a Mac Studio workstation connected using an ATTO Thunderbolt 25GbE adapter, it was possible to come close to saturating the 25GbE network link. In this case, reading and writing a 4K DPX image sequence faster than real-time.
The default SMB Credit value in OneFS is 1024, increasing this value to 8192 incurs more resources, but can improve macOS write performance substantially.
This subject is an advanced topic and care should be taken with increasing this default as it can result in taxing cluster resources.
To increase SMB credits in OneFS, use the following CLI command:
isi_gconfig registry.Services.lwio.Parameters.Drivers.srv.smb2.ClientCreditLimit=8192
The SMB service will need to be restarted on the OneFS cluster with these commands. Restarting the SMB service on the cluster will be disruptive to all SMB clients:
isi services smb disable
isi services smb enable