We run a RAID 5 with 4 HDs und net capacity of 1.2 TB on Windows 2003 Enterprise SP2. As controller we use a 3ware 9500S-12. Firmware version is 2.06.00.009 FE9X. Windows Driver Version is 18.104.22.168
Unfortunately, copying large files is extremely slow and even break away. Read Operations are quit fast. Write cache is turned off, because the controller has no backup battery.
Are any already known causes responsible for this issue?
Or we need to do a firmware update?