Hi,
I'm running Windows Server 2008 R2 with a SSD boot drive, and 7 2TB disks. 5 of the disks are simple volumes, some split into multiple partitions, some single partition, and two identical drives (same model and revision - ST2000DM003), that have been configured as a spanned voumes.
All services packs and patches have been installed.
There are half a dozen windows 7 clients connecting to this server.
The server runs IIS, Firebird DB, WSUS 3 and a couple of other minor apps. The motherboard is an ASROCK Fatality Z77 Professional with Dual Gigabit NICS running LBFO.
The Mobo has 10 sata ports, 6 of which are sata3. The two drives used for the spanned volume are on consecutive sata3 ports. (Asmedia 0 and 1).
When writing data (copying files), from ANY client PC to the spanned volume the speeds are anywhere from 50KB/s to 5MB/s, and the client becomes completely unresponsive for the duration of the copy. A 150mb file might take 3 minutes to copy during which time even moving the mouse takes 10 seconds or more. Once the copy completes the client becomes responsive.
writing data to any other volume has no detectable impact to the responsiveness of the client. Copy will typically write at 60MB/s to 105MB/s, depending on the size and type of data.
I've tried various things like turning off Remote differential compression, autotuning etc as suggested on some forums, and disabled my virus software. But these have not helped.
Which might be causing this and how can I fix this?
EDIT: The infrastructure is cat6 gigabit cabling throughout with Gigabit switches.
thanks
Tanya