I'm building a raid 5 array with 3 1.5TB drives on CentOS 5.5 using mdadm. Everything seems to be working fine, except it's taking forever and I'm not sure if that's normal. It's going on 6 hours now and /proc/mdstat says it's only at 6% (@ ~37MBps). At this rate it's going to take the better half of a week to finish.
I've never setup a raid before so I'm not sure if I did something wrong. It seems like the initial setup should be a lot faster since there is no data on any of the drives.
Also, after I have the raid set up I've got data to transfer over from a drive then I'll be adding it to the array. Is it going to take a similar amount of time to grow the array after? I know they're huge hard drives but this seems ridiculous.