Provided by: zfsutils-linux_0.7.5-1ubuntu15_amd64 bug


       vdev_id - generate user-friendly names for JBOD disks


       vdev_id <-d dev> [-c config_file] [-g sas_direct|sas_switch]
                        [-m] [-p phys_per_port]
       vdev_id -h


       The vdev_id command is a udev helper which parses the file /etc/zfs/vdev_id.conf(5) to map
       a physical path in a storage topology to a channel name.  The  channel  name  is  combined
       with  a  disk enclosure slot number to create an alias that reflects the physical location
       of the drive.  This is particularly helpful when it comes to tasks like  replacing  failed
       drives.    Slot   numbers  may  also  be  re-mapped  in  case  the  default  numbering  is
       unsatisfactory.  The drive aliases will be created as symbolic links in /dev/disk/by-vdev.

       The currently supported topologies are sas_direct and sas_switch.   A  multipath  mode  is
       supported  in  which  dm-mpath  devices  are handled by examining the first-listed running
       component  disk  as  reported  by  the  multipath(8)  command.   In  multipath  mode   the
       configuration file should contain a channel definition with the same name for each path to
       a given enclosure.

       vdev_id also supports creating aliases based on existing udev links in the /dev  hierarchy
       using the alias configuration file keyword.  See the vdev_id.conf(5) man page for details.


       -c <config_file>
              Specifies   the   path   to  an  alternate  configuration  file.   The  default  is

       -d <device>
              This is the only mandatory argument.  Specifies the name of a device in /dev,  i.e.

       -g <sas_direct|sas_switch>
              Identifies  a  physical  topology  that  governs  how  physical paths are mapped to

              sas_direct - in this mode a channel is uniquely identified by a PCI slot and a  HBA
              port number

              sas_switch  -  in  this  mode a channel is uniquely identified by a SAS switch port

       -m     Specifies that vdev_id(8) will handle only dm-multipath devices.  If set  to  "yes"
              then  vdev_id(8)  will  examine  the first running component disk of a dm-multipath
              device as listed by the multipath(8) command to determine the physical path.

       -p <phys_per_port>
              Specifies the number of PHY devices associated with a SAS HBA port  or  SAS  switch
              port.   vdev_id(8) internally uses this value to determine which HBA or switch port
              a device is connected to.  The default is 4.

       -h     Print a usage summary.