Macro 32 Ramblings

Hard Disk is seen in the show chassis hardware detail and boot sequence sysctl -a |grep bootdev but missing /var in the show system storage output.

In some cases, the HDD is present in the hardware inventory and boot sequence but the /var directory cannot be seen in the file system while issuing the show system storage command. When the /var (HDD) directory is missing in multiple Routing engines, this might not be a hardware problem and this could easily be recovered using the procedures below. If these steps don’t solve the problem, the Routing Engine may need to be replaced due to a hardware issue.

Below are the symptoms of the problem.

/var is not seen in the ‘show system storage’ output:

re1> show system storage
Filesystem              Size       Used      Avail  Capacity   Mounted on
/dev/ad0s1a             865M       109M       687M       14%  /
devfs                   1.0K       1.0K         0B      100%  /dev
devfs                   1.0K       1.0K         0B      100%  /dev/
/dev/md0                 26M        26M         0B      100%  /packages/mnt/jbase
/dev/md1                110M       110M         0B      100%  /packages/mnt/jkernel-9.0R3.6
/dev/md2                 38M        38M         0B      100%  /packages/mnt/jpfe-T-9.0R3.6
/dev/md3                3.7M       3.7M         0B      100%  /packages/mnt/jdocs-9.0R3.6
/dev/md4                 35M        35M         0B      100%  /packages/mnt/jroute-9.0R3.6
/dev/md5                 10M        10M         0B      100%  /packages/mnt/jcrypto-9.0R3.6
/dev/md6                 22M        22M         0B      100%  /packages/mnt/jpfe-common-9.0R3.6
/dev/md7                2.0G       280K       1.8G        0%  /tmp
/dev/md8                2.0G        33M       1.8G        2%  /mfs
/dev/ad0s1e              96M        48K        88M        0%  /config
procfs                  4.0K       4.0K         0B      100%  /proc

ad1 (HDD) is listed in the Hardware inventory:

re1> show chassis hardware detail | match "ad|Rou"
Routing Engine 0 REV 07   740-008883   P11123903280      RE-4.0
ad0     977 MB  SanDisk SDCFJ-1024   019314J0807J2535  Compact Flash
ad1   28615 MB  FUJITSU MHT2030AR    NN6QT52154UB      Hard Disk
Routing Engine 1 REV 07   740-008883   P11123902797      RE-4.0
ad0     977 MB  SanDisk SDCFJ-1024   012013I1807L5405  Compact Flash
ad1   28615 MB  FUJITSU MHT2030AR    NN6QT52155S7      Hard Dis

HDD present in the boot sequence

lab@Centre-re1> start shell
% sysctl -a |grep bootdev
machdep.guessed_bootdev: 2686451712
machdep.bootdevs: pcmcia-flash,pcmcia-flash-1,compact-flash,disk,lan
machdep.nextbootdev: pcmcia-flash
machdep.currbootdev: compact-flash

The /var can be recovered with the following procedure:

1. Boot up RE into single user mod. See steps 1 through 3 of KB1972.
2. Issue the command: fsck -y /dev/ad1s1f a few times to correct any error.
3. Issue the command: mount /var
4. Reboot the RE again to see if /var can be successfully mounted on /dev/ad1.