This article explains the issue wherein the SPC3 cards will not come up and will be stuck in present state.
Console logs of SPC3 card will show the NFSD timeout as given below:
root@SRX:~ # cty fpc0 pic01 mount.nfs: Connection timed out mount.nfs: Connection timed out
This issue is seen if the name-server has been configured in mgmt-junos routing instance and it is unreachable. SPC3 card will try to check the reachability to the configured name-server while completing the mounting process during the bootup and will fail to mount if the name-server is unreachable.
This can be fixed by deleting the unreachable name-server configuration from mgmt-junos routing instance.