SCSI Reserve and Mount Point

Hello Experts,

Pls help with the 2 points.

1)Difference between SPC-2 SCSI reserve and SCSI persistent reserver. What are these?

2) Lets say we have two mount points in backup selection with multistream enabled in backup selection and in Policy.
   \exchange, \firewall now we exclude this firewall mount point directory in exclude_list.
So what will happen. Job for firewall would start or get failed? How many jobs would run?

Thanks,