Rc.sysinit mounts root FS then why we have entry in fstab

Linux and Unix-Like Red Hat
1

Hello,

In linux /etc/rc.d/rc.sysinit mounts root File System as RW during the booting phase.
So why we have entry of it in /etc/fstab?

Thanks,
Nitin

2

For one thing, to document that the root partition is in use. A number of other programs read fstab. The man page for fstab says that field 5 is for dump(8) and field 6 is for fsck(8). The docs for field 6 even include special instructions for the root partition.