I have two RAID arrays currently setup on a ICH9R RAID controller:
2x160GB - RAID0 (1 partition)
4x750GB - RAID5 (1 partition)
I just started copying a 4.37GB file from the RAID0 to the RAID5. Everything is going fine, the transfer is about half-way completed after about 30 seconds, with another 30 seconds remaining. Then all of a sudden the estimated time remaining soars to 20 minutes. Neither hard drive is being significantly accessed otherwise.
Likewise, if I copy 30GB worth of files, the same process happens, every minute or so the transfer speed slows right down to about 50 times slower than normal.
Any ideas what is causing this?
Thanks.