Juniper M Series User Manual

When the Hard Disk Is Removed from the Boot List
Problem The following boot messages list on the console shows symptoms that signify a hard
disk failure. These messages are not in the boot-messages log file.
/dev/ad1s1f: CAN'T CHECK FILE SYSTEM.
/dev/ad1s1f: UNEXPECTED INCONSISTENCY; RUN fsck MANUALLY.
Can't open /dev/ad1s1f: Device not configured
WARNING:
WARNING: /var mount failed, building emergency /var
WARNING:
dumpon: sysctl: kern.dumpdev: Device not configured
mgd: commit complete
dumpon: sysctl: kern.dumpdev: Device not configured
mgd: commit complete
Solution The boot messages show that the hard disk (ad1) was removed from the boot list (using
Junos OS, Release 6.1R1.4).
Verify That the Hard Disk Did Not Mount
Problem To verify that the hard disk (ad1) did not get mounted, use the following command:
user@host> show system storage
The following sample output was taken from a RE-333 Routing Engine.
user@host> show system storage
Filesystem 512-blocks Used Avail Capacity Mounted on
/dev/ad0s1a 218690 60294 140902 30% /
devfs 32 32 0 100% /dev/
/dev/vn0 20044 20044 0 100% /packages/mnt/jbase
devfs 32 32 0 100% /dev/
/dev/vn1 51920 51920 0 100%
/packages/mnt/jkernel-6.1R1.4
/dev/vn2 22328 22328 0 100%
/packages/mnt/jpfe-M160-6.1R1.4
/dev/vn3 3844 3844 0 100%
/packages/mnt/jdocs-6.1R1.4
/dev/vn4 23328 23328 0 100%
/packages/mnt/jroute-6.1R1.4
/dev/vn5 8820 8820 0 100%
/packages/mnt/jcrypto-6.1R1.4
mfs:139 127006 16914 99932 14% /tmp
/dev/ad0s1e 24234 28 22268 0% /config
procfs 8 8 0 100% /proc
Solution The command shows that the hard disk (ad1) is not mounted. Instead, /var now exists
only in the swap partition (mfs:139), so any contents saved to /var will not be saved at
the next reboot.
user@host> start shell
user@host% ls -l /
total 47
-rw-r--r-- 1 root wheel 4735 Mar 31 2001 COPYRIGHT
dr-xr-xr-x 2 root wheel 512 Jan 20 2004 altconfig
dr-xr-xr-x 2 root wheel 512 Jan 20 2004 altroot
drwxr-xr-x 2 root wheel 512 Dec 29 12:00 bin
dr-xr-xr-x 3 root wheel 512 Feb 4 23:16 boot
199Copyright © 2012, Juniper Networks, Inc.
Chapter 6: Monitoring the Routing Engine

Juniper M Series Specifications

General

Brand	Juniper
Model	M Series
Category	Network Router
Language	English