[Sam Zimman] “do you switch the former spare from slot 7 to slot 2”
No, once the drive rebuilds in slot 7, it will look for the data there. Don’t move it!
Just a thought: Is your XRAID formatted as a RAID 50? If so, you might not need to dedicate a slot to a hot spare. I used to have a hot spare in the set ready to go, but I decided it made more sense to use all 14 drives and just keep an extra drive in a drawer in the studio. When a drive goes down the XRAID emails me and I just pop in the spare I have sitting in the drawer. It then rebuilds automatically (takes about 30 hours) and I can keep working in the meantime.
The only difference is having a hot spare in the chasis will let the XRAID begin rebuilding the array immediately.