A 40TB file server in a RAID 5 configuration, lost two drives simultaneously. One drive is totally dead and the other drive goes in and out of being recognized by the server. We replaced the dead drive and the server started to rebuild over night, however, when we got in this morning the the other drive was showing errors and the rebuild process had slowed way down. When we previously had restarted the machine the drive seems to recover and work fine. My question is, if we restart the server during the rebuild, would the RAID start to rebuild from the beginning or pick up where it left off? Also, does anyone have any other recommendations beside letting it rebuild or restarting?