Hello Peter,  Thank you for your quick reply.  You provided two key pieces of information. 1) that the nfs.v3xfersize parameter could be modified in DART version 5.6 and before, and 2) that when the server_param "-info" option is used on an INDIVIDUAL parameter, it provides additional details that are not reported when information on multiple parameters are being requested.  I must admit, I missed the fact that additional details were provided when an individual parameter was queried with "-info". The server_param man page and its entry in the Celerra Parameters manual do not convey this information in the description of the "-info" option, but if you read further down the man page or the Parameters manual, there is a clear example of the command output of "-info" which shows the level of detail.  For our Celerra NS20 running DART 5.6.40-3, here is the resulting output:  $ server_param server_2 -f nfs -i v3xfersize server_2 : name                   = v3xfersize facility_name          = nfs default_value          = 32768 current_value          = 32768 configured_value       = user_action            = none change_effective       = immediate range                  = (8192,32768) description            = NFSv3 I/O transfer size  Unfortunately, this output shows that the maximum value is only 32kb in version 5.6, so increasing the parameter beyond 32kb is not possible.  The information also shows that the change can be done online with an immediate effect without rebooting the data mover.  Again, thank you for your help. It identified how to obtain the information that I was looking for.  Regards,  Dave B
Hello.  We are migrating off an old Celerra NS20 that is running version 5.6.40-3, and would like to improve the the efficiency of the migration by increasing the NFS rsize/wsize, which is controlled by the Celerra nfs.v3xfersize parameter. This parameter is currently set at 32kb, the default.  For version 5.6.40-3, can the nfs.v3xfersize parameter be increased?  If so, to what maximum value?  The Linux clients being used are capable of a 1MB rsize/wsize. The earliest documentation that I can find related to increasing nfs.v3xfersize is for version 6.0+, so increasing the parameter for version 5.6.40-3 my not be possible.  If the value can be increased, can it be done on-line, and what would be the artifacts? Ideally, existing NFS mounts would continue to use the previous setting, and new client mount requests could negotiate a higher value.  Are there any additional settings that need to be added to the NFS share definition or export to allow for a larger rsize/wsize ... on this old version of DART  Thank you for your help.  Dave B.
Maximum Celerra nfs.v3xfersize for old NS20 running version 5.6.40-3