How to Create a Trans Metadevice Using Mirrors (Command Line)

After checking the prerequisites ("Prerequisites for Creating DiskSuite Objects"), and the preliminary information ("Preliminary Information for Creating Trans Metadevices"), use the metainit(1M) to create the trans metadevice.

Example -- Creating a Trans Metadevice Using Mirrors

# umount /home1
# metainit d64 -t d30 d12
d64: Trans is setup
(Edit the /etc/vfstab file so that the file system references the trans metadevice)
# mount /home1

Mirror d30 contains a file system mounted on /home1. The mirror to contain the logging device is d12. First, the file system is unmounted. The metainit command with the -t option creates the trans metadevice, d64.

Next, the line in the /etc/vfstab file that mounts the file system must be changed to reference the trans metadevice. For example, the following line:

/dev/md/dsk/d30 /dev/md/rdsk/d30 /home1 ufs 2 yes -

should be changed to:

/dev/md/dsk/d64 /dev/md/rdsk/d64 /home1 ufs 2 yes -

Logging becomes effective for the file system when the file system is remounted.

On subsequent file system remounts or system reboots, instead of checking the file system, fsck(1M) displays a logging message for the metadevice:

# reboot
...
/dev/md/rdsk/d64: is logging