I am seeing a strange problem when copying files from my using my Duo v1 (2TB HD204UI X-RAID) to a Mac (Mac Pro and Macbook Pro). I am using firmware 4.1.8 and Mac OS 10.7.4 over a gigabit LAN. On the Duo, all the Performance Options are enabled. The Duo is also set to restart daily.
The problem is this: when I copy a large file from the media share to my desktop, I will get around 10MB/s transfer rate (measured using Activity Monitor). This will remain around this figure until the copy is done. However, if I, while the copying is in progress, right click on the file using Finder and select "Make Alias", the speed will increase to around 25MB/s and stay at this speed until the copy is complete. It will also remain at this speed for subsequent copies. If I dismount and re-mount the share, the slow speed returns .. This is the same for AFP and SMB protocols
Why would writing to the share when the file is being read, increase the speed so dramatically?
Last edited by ianch99
on Tue Jul 03, 2012 7:58 am, edited 1 time in total.