Use this procedure to mirror the root (/) file system.
Become superuser on a node of the cluster.
Use the metainit(1M) command to put the root slice in a single-slice (one-way) concatenation.
Use the physical disk name of the root-disk slice (cNtXdYsZ).
# metainit -f submirror1 1 1 root-disk-slice |
Create a second concatenation.
# metainit submirror2 1 1 submirror-disk-slice |
Create a one-way mirror with one submirror.
# metainit mirror -m submirror1 |
The metadevice or volume name for the mirror must be unique throughout the cluster.
Run the metaroot(1M) command.
This command edits the /etc/vfstab and /etc/system files so the system can be booted with the root (/) file system on a metadevice or volume.
# metaroot mirror |
Run the lockfs(1M) command.
This command flushes all transactions out of the log and writes the transactions to the master file system on all mounted UFS file systems.
# lockfs -fa |
Evacuate any resource groups or device groups from the node.
# scswitch -S -h node |
Evacuates all resource groups and device groups
Specifies the name of the node from which to evacuate resource or device groups
Reboot the node.
This command remounts the newly mirrored root (/) file system.
# shutdown -g0 -y -i6 |
Use themetattach(1M)) command to attach the second submirror to the mirror.
# metattach mirror submirror2 |
Is the disk that is used to mirror the root disk physically connected to more than one node (multiported)?
If no, go to Step 11.
If yes, enable the localonly property of the raw disk device group for the disk used to mirror the root disk. You must enable the localonly property to prevent unintentional fencing of a node from its boot device if the boot device is connected to multiple nodes.
If necessary, use the scdidadm(1M) -L command to display the full device ID (DID) pseudo-driver name of the raw disk device group.
In the following example, the raw disk device group name dsk/d2 is part of the third column of output, which is the full DID pseudo-driver name.
# scdidadm -L ... 1 phys-schost-3:/dev/rdsk/c1t1d0 /dev/did/rdsk/d2 # scconf -c -D name=dsk/d2,localonly=true |
For more information about the localonly property, see the scconf_dg_rawdisk(1M) man page.
View the node list of the raw disk device group.
Output will look similar to the following, where N is the DID number.
# scconf -pvv | grep dsk/dN Device group name: dsk/d2 ... (dsk/d2) Device group node list: phys-schost-1, phys-schost-3 ... |
Does the node list contain more than one node name?
Remove all nodes from the node list for the raw disk device group except the node whose root disk you mirrored.
Only the node whose root disk you mirrored should remain in the node list.
# scconf -r -D name=dsk/dN,nodelist=node |
Specifies the cluster-unique name of the raw disk device group
Specifies the name of the node or nodes to remove from the node list
Use the scconf(1M) command to enable the localonly property.
When the localonly property is enabled, the raw disk device group is used exclusively by the node in its node list. This prevents unintentional fencing of the node from its boot device if the boot device is connected to multiple nodes.
# scconf -c -D name=rawdisk-groupname,localonly=true |
Specifies the name of the raw disk device group
Record the alternate boot path for possible future use.
If the primary boot device fails, you can then boot from this alternate boot device. See “Troubleshooting the System” in Solstice DiskSuite 4.2.1 User's Guide or “Mirroring root () Special Considerations” in Solaris Volume Manager Administration Guide for more information about alternate boot devices.
# ls -l /dev/rdsk/root-disk-slice |
Repeat Step 1 through Step 11 on each remaining node of the cluster.
Ensure that each metadevice or volume name for a mirror is unique throughout the cluster.
Do you intend to mirror the global namespace, /global/.devices/node@nodeid?
If yes, go to How to Mirror the Global Namespace.
If no, go to Step 14.
Do you intend to mirror file systems than cannot be unmounted?
If yes, go to How to Mirror File Systems Other than Root (/) That Cannot Be Unmounted.
If no, go to Step 15.
Do you intend to mirror user-defined file systems?
If yes, go to How to Mirror File Systems That Can Be Unmounted.
If no, go to How to Create a Diskset to create a diskset.
The following example shows creation of mirror d0 on the node phys-schost-1, which consists of submirror d10 on partition c0t0d0s0 and submirror d20 on partition c2t2d0s0. Disk c2t2d0 is a multiported disk, so the localonly property is enabled.
(Create the mirror) # metainit -f d10 1 1 c0t0d0s0 d11: Concat/Stripe is setup # metainit d20 1 1 c2t2d0s0 d12: Concat/Stripe is setup # metainit d0 -m d10 d10: Mirror is setup # metaroot d0 # lockfs -fa (Reboot the node) # scswitch -S -h phys-schost-1 # shutdown -g0 -y -i6 (Attach the second submirror) # metattach d0 d20 d0: Submirror d20 is attached (Display the node list of the mirror disk's raw disk device group) # scconf -pvv | grep dsk/d2 Device group name: dsk/d2 ... (dsk/d2) Device group node list: phys-schost-1, phys-schost-3 ... (Remove phys-schost-3 from the node list for the raw disk device group) # scconf -r -D name=dsk/d2,nodelist=phys-schost-3 (Enable the localonly property of the mirrored disk's raw disk device group) # scconf -c -D name=dsk/d2,localonly=true (Record the alternate boot path) # ls -l /dev/rdsk/c2t2d0s0 lrwxrwxrwx 1 root root 57 Apr 25 20:11 /dev/rdsk/c2t2d0s0 -> ../../devices/node@1/pci@1f,0/pci@1/scsi@3,1/disk@2,0:a,raw |