I've just added a Readynas Ultra 4 Plus to my LAN. Until now I had been using an NV+. Each night I run a backup of files on the ReadNAS to a USB drive on my PC, using Genie9 (fka Genie-Soft) Backup. This worked fine with the NV+, but on the Ultra, the backup software monopolises the connection, and any attempt to access the NAS at the same time from the same PC (using Windows Explorer) is blocked. If I try to save open files from my PC to the NAS, I get the Windows error "Too Many Open Files". I can still access the NAS from another machine, so the NAS is not overloaded.
Searching the web, I believe this is a problem with Samba, the underlying OS of the NAS, which doesn't know how to throttle open connections to Windows 7. I tried disabling oplocks on the relevant share via FrontView. This had no effect. The backup is still running, so I have not rebooted the NAS, although I assume disabling oplocks does not require a reboot (FrontView doesn't say it does).
Apparently this bug was fixed in Samba 3.5.0 (bug 6837) released 1-Mar-2010. Or was it? What version is ReadyNAS using in RAIDiator 4.2.19?
By the way I cannot find the drafts folder after clicking "Save" to save a draft of this message. Luckily I have a copy in notepad.