Yes, the rebuild will simply pick up where it left off after the rebuild and the array will remain online (although with degraded performance) until complete.
A simple question:  I'm rebuilding a raid 5 on a PERC6/i. Everything seems to be going fine, my question is can I restart and boot the server without interrupting the rebuild? I started the rebuild process through the card's bios menu (so on boot) and I'm wondering if the card will continue to do its job if I exit out of it and start up the OS on the server?   Thanks for any reply.  -Colter  *edit* The OS is loaded on a USB drive by the way, I thought that pertinent. The raid array is used as a datastore on an ESXI installation, so it will be needed once booted, but not for the boot itself.
Rebuilding a VD (RAID 5), Can I boot during?