My current setup, with a DS209 in RAID-1, has been working beautifully for over six months. All of a sudden, with no apparent change from my end, all of my Windows 7 PC's take at least 45 seconds to open or change folders when browsing with Windows Explorer.
- My SMB file-transfer speeds are still great (~45MB/s w/ jumbo frames).
- It doesn't matter if I browse the local network with Explorer, map the share to a drive with hostname or IP address, or use "net use" to mount the share; All of the folder changes hang for nearly a minute.
- All other interactions with the Diskstation are fine and delay-free: SSH, ping, web-management, remote-access.
- The Diskstation hangs especially bad when opening a specific share name (video, music, pictures) for the first time.
If anyone would like to took, I took some Wireshark packet captures of the whole process between my PC and the Diskstation: from opening the "Network" folder in Windows Explorer to opening a sub-folder a couple levels deep. The "hang" is shown in the capture as well. A SMB request packet is sent to the DS209, then nothing... for 47 seconds, and then finally there's a response packet from the DS209. After which, the SMB's protocol for viewing directories takes an unusually long time to complete as well.