I have a RAID 5 array of 4 1.5TB 7200 rpm sata drives and I have started an expansion to add another 1.5TB drive to the array.
It seems to be working, but seems very slow. After 24 hours it is 25% complete.
The server is recording streaming video at about 4MB/s while the expansion is going on.
Does this seem normal?
Also, if I set up a hot spare for the array will it take 4 days for the spare to rebuild in the event of a drive failure?