what is the diffrence between runlevel '1' and runlevel 'S' in Solaris ?

Posted on 2008-11-13
Last Modified: 2013-12-27
How do we differentiate between runlevel 'S' and runlevel '1' in Solaris. What is the working difference ?
Question by:beer9
    LVL 48

    Expert Comment

    There is no difference.
    LVL 4

    Assisted Solution

    Run level S is single user mode. This run level does not allow remote logins of other users, and makes an attempt to mount all the file systems for the performance of administrative tasks

    Run level 1 is similar to run level s. Run level 1 is an administrative run level, however, it also allows remote logins. Again, this administrative mode makes an effort to mount all available file systems.

    LVL 22

    Assisted Solution

    In general, run level 1 is a more primitive state, preventing all but the bare minimum of services from running. Run level S is much more advanced, but only allows root to login so that root is free to do administrative tasks without worrying about affecting other users or having what they are doing cause problems.
    LVL 40

    Assisted Solution

    LVL 40

    Expert Comment

    from the 2nd link, I could tell that it has to do with which file systems are mounted.
    LVL 6

    Accepted Solution

    Level 1-- root slice is mounted and rest of the file system are in umounted state..
    /-- mounted

    rest are unmounted by DEFAULT
    external drives

    level s -whole file system (all slices) are in mounted state by DEFAULT

    Most of admins uses -S option .. and unmount slices individually and work on them

    hope this help ..


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