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What do the different Junos file system device (Storage Media) names mean?

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Knowledge Base ID: KB11224
Last Updated: 30 Dec 2011
Version: 6.0

Summary:

'show system storage' and 'show chassis hardware detail' outputs have diverse file system device names such as ad0, ad1, ad2, ad3, da0, and so on . The information below explains what these file system device names mean.

Problem or Goal:

Cause:
 

Solution:
Juniper products operated by Junos, such as M / T / J-series routers, MX-series, and EX switches have different types of physical storage devices. This results in different file system device names when issuing the show system storage CLI command.  Below are examples.

EX4200 switch:
juniper@EX4200-24F> show system storage                    
Filesystem          Size       Used      Avail  Capacity   Mounted on
/dev/da0s2a          92M        71M      14M        83%     /
devfs               1.0K       1.0K       0B       100%     /dev
devfs               1.0K       1.0K       0B       100%     /dev/
/dev/md0             30M        30M       0B       100%     /packages/mnt/jbase
/dev/md1             12M        12M       0B       100%     /packages/mnt/jcrypto-ex-9.0R2.10
/dev/md2            3.9M       3.9M       0B       100%     /packages/mnt/jdocs-ex-9.0R2.10
/dev/md3             67M        67M       0B       100%     /packages/mnt/jkernel-ex-9.0R2.10
/dev/md4             11M        11M       0B       100%     /packages/mnt/jpfe-ex42x-9.0R2.10
/dev/md5             26M        26M       0B       100%     /packages/mnt/jroute-ex-9.0R2.10
/dev/md6            9.6M       9.6M       0B       100%     /packages/mnt/jswitch-ex-9.0R2.10
/dev/md7             13M        13M       0B       100%     /packages/mnt/jweb-ex-9.0R2.10
/dev/md8             63M       8.0K      58M         0%     /tmp
/dev/da0s2f          61M       1.4M      55M         2%     /var
/dev/da0s3e          28M       266K      25M         1%     /config
/dev/da0s3d         157M       2.6M     142M         2%     /var/tmp
/dev/md9            118M       7.5M     101M         7%     /var/rundb
procfs              4.0K       4.0K       0B       100%     /proc
/var/jail/etc        61M       1.4M      55M         2%     /packages/mnt/jweb-ex-9.0R2.10/jail/var/etc
/var/jail/run        61M       1.4M      55M         2%     /packages/mnt/jweb-ex-9.0R2.10/jail/var/run
/var/jail/tmp        61M       1.4M      55M         2%     /packages/mnt/jweb-ex-9.0R2.10/jail/var/tmp
/var/tmp            157M       2.6M     142M         2%     /packages/mnt/jweb-ex-9.0R2.10/jail/var/tmp/uploads
devfs               1.0K       1.0K       0B       100%     /packages/mnt/jweb-ex-9.0R2.10/jail/dev

M320 router:
lab@m320-re0> show system storage
Filesystem          Size       Used      Avail    Capacity   Mounted on
/dev/ad0s1a         217M       111M        89M      55%      /
devfs               1.0K       1.0K         0B      100%     /dev
devfs               1.0K       1.0K         0B      100%     /dev/
/dev/md0             23M        23M         0B      100%     /packages/mnt/jbase
/dev/md1             80M        80M         0B      100%     /packages/mnt/jkernel-8.5-20080404.0
/dev/md2             40M        40M         0B      100%     /packages/mnt/jpfe-M320-8.5-20080404.0
/dev/md3            3.5M       3.5M         0B      100%     /packages/mnt/jdocs-8.5-20080404.0
/dev/md4             28M        28M         0B      100%     /packages/mnt/jroute-8.5-20080404.0
/dev/md5            8.8M       8.8M         0B      100%     /packages/mnt/jcrypto-8.5-20080404.0
/dev/md6             37M        37M         0B      100%     /packages/mnt/jpfe-common-8.5-20080404.0
/dev/md7            2.0G       8.0K       1.8G        0%     /tmp
/dev/md8            2.0G       434K       1.8G        0%     /mfs
/dev/ad0s1e          24M        44K        22M        0%     /config
procfs              4.0K       4.0K         0B      100%     /proc
/dev/ad1s1f          34G        21G        11G       65%     /var

M120 router:
lab@m120-re1> show system storage
Filesystem          Size       Used      Avail  Capacity   Mounted on
/dev/ad0s1a         885M        62M       753M        8%   /
devfs                16K        16K         0B      100%   /dev/
/dev/vn0             15M        15M         0B      100%   /packages/mnt/jbase
/dev/vn1             53M        53M         0B      100%   /packages/mnt/jkernel-8.3R3.4
/dev/vn2             37M        37M         0B      100%   /packages/mnt/jpfe-M120-8.3R3.4
/dev/vn3            3.0M       3.0M         0B      100%   /packages/mnt/jdocs-8.3R3.4
/dev/vn4             18M        18M         0B      100%   /packages/mnt/jroute-8.3R3.4
/dev/vn5            7.6M       7.6M         0B      100%   /packages/mnt/jcrypto-8.3R3.4
/dev/vn6             14M        14M         0B      100%   /packages/mnt/jpfe-common-8.3R3.4
mfs:137             2.0G       8.0K       1.8G        0%   /tmp
mfs:144             2.0G       274K       1.8G        0%   /mfs
/dev/ad0s1e          98M        58K        90M        0%   /config
procfs              4.0K       4.0K         0B      100%   /proc
/dev/ad2s1f          35G       5.9G        26G       19%   /var

Some products list the detailed hardware information about these storage devices in show chassis hardware detail output. Below are examples from the M320 and M120 routers.

M320 Router:
lab@m320-re0> show chassis hardware detail
Hardware inventory:
Item             Version  Part number  Serial number       Description
Chassis                                70978               M320
Midplane         REV 05   710-009120   RB5506              M320 Midplane
FPM GBUS         REV 05   710-005928   JR9683              M320 Board
FPM Display      REV 05   710-009351   JR1244              M320 FPM Display
CIP              REV 05   710-005926   JP3199              M320 CIP
PEM 0            Rev 05   740-009149   SD32841             AC Power Entry Module
PEM 1            Rev 05   740-009149   SD32857             AC Power Entry Module
PEM 2            Rev 05   740-009149   SC25269             AC Power Entry Module
PEM 3            Rev 05   740-009149   SD32835             AC Power Entry Module
Routing Engine 0 REV 09   740-008883   P11123908067        RE-4.0
  ad0     245 MB  STI Flash 7.3.0      STI1J9a506054071112 Compact Flash
  ad1   38154 MB  FUJITSU MHV2040AS    NT14T6325YJB        Hard Disk
Routing Engine 1 REV 09   740-008883   P11123908042        RE-4.0
  ad0     245 MB  STI Flash 7.3.0      STI1J74006054073341 Compact Flash
  ad1   38154 MB  FUJITSU MHV2040AS    NT14T6325YE6        Hard Disk
CB 0             REV 07   710-009115   JR0671              M320 Control Board
CB 1             REV 07   710-009115   JR0679              M320 Control Board

M120 Router
lab@m120-re1> show chassis hardware detail   
Hardware inventory:
Item             Version  Part number  Serial number       Description
Chassis                                JN108C024AEA        M120
Midplane         REV 01   710-018041   RB9028              M120 Midplane
FPM Board        REV 06   710-011407   DA9329              M120 FPM Board
FPM Display      REV 02   710-011405   DD0242              M120 FPM Display
FPM CIP          REV 05   710-011410   DD0321              M120 FPM CIP
PEM 0            Rev 04   740-011936   000412              AC Power Entry Module
PEM 1            Rev 04   740-011936   000414              AC Power Entry Module
Routing Engine 0 REV 06   740-014080   1000686806          RE-A-1000
  ad0     999 MB  SILICONSYSTEMS INC 1GB 027CTS69Sw605DC00676 Compact Flash
  ad2   38154 MB  HTE541040G9SA00      MPBBT0XHE0VTRM      Hard Disk
Routing Engine 1 REV 06   740-014080   1000690988          RE-A-1000
  ad0     999 MB  SILICONSYSTEMS INC 1GB 027CTS69Sw605DC00329 Compact Flash
  ad2   38154 MB  FUJITSU MHV2040BS    NW26T6B25HKB        Hard Disk
CB 0             REV 08   710-011403   DB0719              M120 Control Board
CB 1             REV 08   710-011403   DB0714              M120 Control Board


Below is the summary of the file system device names in Junos:

ad0  Internal Compact-flash
ad1  Hard-disk
   (for RE-333, RE-600, RE-1600, RE-400, RE-850)
or
Solid Sate Drive (SSD)
(for RE-C1800, RE-C2600, RE- A-1800, RE-S-1800)
ad2  Hard-disk
   (for RE-A-2000, RE-A-1000, RE-S-2000, RE-S-1300)
or
 Removable-compact-flash
    (J2320, J2350, J4300, J6300)
ad3  PCMCIA Card
da0
(da1)
 USB storage device
   (in EX-series switches, da0 is internal USB flash, da1 is external USB flash)
md0
(md1, md2, etc)
 Memory Virtual Disk
vn0
(vn1, vn2, etc)
 Virtual Node Disk


For more information on the file system device names refer to Routing Engines and Storage Media Names.



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