Hi ,
For SMBV1, the default buffer size is related with registry value called SizReqBuf. And the default value of SizReqBuf for server SKUs with >= 512MB RAM is 16KB (16,644 bytes). If the server has less than 512MB RAM then the default is 4,356 bytes.
For SMBV2 and SMBV3, default buffer size is 1MB (1024*1024).
Best Regards,
Candy
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