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dev(4fs)

dev(4FS)                         File Systems                         dev(4FS)



NAME
       dev - Device name file system

DESCRIPTION
       The dev filesystem manages the name spaces of devices under the Solaris
       operating system. The global zone's instance of the dev  filesystem  is
       mounted during boot on /dev.


       A  subdirectory  under /dev can have unique operational semantics. Most
       of the common device names under  /dev  are  created  automatically  by
       devfsadm(8).  Others,  such  as  /dev/pts,  are dynamic and reflect the
       operational state of the system. You can manually generate device names
       for  newly  attached hardware by invoking devfsadm(8) or implicitly, by
       indirectly causing a lookup or readdir operation in the  filesystem  to
       occur.  For example, you can discover a disk that was attached when the
       system was powered down (and generate a name for that device) by invok‐
       ing format(8)).


       The /dev/zvol/dsk and /dev/zvol/rdsk directories are generated based on
       the ZFS dataset hierarchy. Each  ZFS  file  system  is  represented  in
       /dev/zvol/dsk  and  /dev/zvol/rdsk  as a directory. Each ZFS volume and
       each snapshot of a ZFS volume is  represented  as  a  block  device  in
       /dev/zvol/dsk  and  as a character device in /dev/zvol/rdsk. Within the
       global zone, symbolic links to device nodes within  /devices  are  used
       instead of device nodes. See devfs(4FS).


       Within  non-global  zones, the names that appear under /dev/zvol repre‐
       sent the aliased dataset names. See zonecfg(8).


       Within non-global zones, devices  that  are  added  by  way  of  device
       resources  can  have  the same name as those that appear in the aliased
       dataset namespace. See zonecfg(8). If such conflicts occur, the  device
       file corresponding to the device resource is seen and any corresponding
       /dev/zvol entries for datasets that are delegated to the  zone  is  not
       seen.  For example, if the device /dev/zvol/rdsk/rpool/vol1 is added as
       a device resource  and  the  within  the  non-global  zone  the  volume
       rpool/vol1 is created, the file /dev/zvol/rdsk/rpool/vol1 is the device
       allocated from the global zone, not the one  that  appears  within  the
       non-global zone's aliased dataset namespace.

FILES
       /dev    Mount point for the /dev filesystem in the global zone.


SEE ALSO
       devfsadm(8), format(8), zonecfg(8)

NOTES
       The global /dev instance cannot be unmounted.



Oracle Solaris 11.4               11 Dec 2020                         dev(4FS)
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