/etc/fstab not respected at boot

[MartinBrugnara]

I modified /etc/fstab to mount a separate disk for squid;
when the systems reboots it does not mount the new disk.
But if i type 'mount -a' it does mount it.

Device Mountpoint FStype Options Dump Pass#

/dev/ufsid/571d2590257d6429 / ufs rw 1  1
/dev/label/swap0 none swap sw 0 0
/dev/ufsid/571cc02d2025b506 /var/squid/cache ufs rw 0  2

I am missing something?
Is the /etc/fstab I see once the system booted the same that pfSense uses while booting?

Thank you,
– Martin