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--- NOTICE: System is running on alternate media device (/dev/mirror/rd0s1a)

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Knowledge Base ID: KB12229
Last Updated: 10 Jun 2010
Version: 5.0

Summary:
Following notice is seen after JUNOS upgrade
--- NOTICE: System is running on alternate media device  (/dev/mirror/rd0s1a).

Problem or Goal:
After upgrading to certain releases in JUNOS 8.5 or higher, and enabling  mirror-flash-on-disk is configured under the [system] hierarchy, the following message is displayed on the CLI prompt on logging into the node:
geg@austria-re0> request routing-engine login other-routing-engine 
€
--- JUNOS 8.5R4.3 built 2008-08-12 23:16:55 UTC
---
--- NOTICE: System is running on alternate media device  (/dev/mirror/rd0s1a).
---
geg@austria-re1> 

geg@austria-re1> show configuration system mirror-flash-on-disk 
mirror-flash-on-disk;


This message does not make sense, as the mirror device rd0s1a listed in the file system:
geg@austria-re1> show system storage 
Filesystem              Size       Used      Avail  Capacity   Mounted on
/dev/mirror/rd0s1a       885M        98M       716M      12%  /
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-8.5R4.3
/dev/md2                8.8M       8.8M         0B      100%  /packages/mnt/jpfe-M7i-8.5R4.3
/dev/md3                3.5M       3.5M         0B      100%  /packages/mnt/jdocs-8.5R4.3
/dev/md4                 28M        28M         0B      100%  /packages/mnt/jroute-8.5R4.3
/dev/md5                8.8M       8.8M         0B      100%  /packages/mnt/jcrypto-8.5R4.3
/dev/md6                 37M        37M         0B      100%  /packages/mnt/jpfe-common-8.5R4.3
/dev/md7                504M       8.0K       463M        0%  /tmp
/dev/md8                504M       458K       463M        0%  /mfs
/dev/mirror/rd0s1e        98M        28K        90M       0%  /config
procfs                  4.0K       4.0K         0B      100%  /proc
/dev/ad1s1f              35G       308M        32G        1%  /var
                    
geg@austria-re1> 

Solution:
This is a cosmetic issue and does not have any other side effects than the printed notice. The issue has been introduced with the fix for PR/268474.

The issue is tracked via PR/311768.
Please check the below link for information in which JUNOS releases this cosmetic issue is fixed.

Purpose:
Troubleshooting

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