Booting From Alternate Boot Devices
If your primary submirror on a mirrored root (/) fails, you will need to initiate the boot from the other submirror. You can either configure the system to boot automatically from the second side of the mirror, or can manually boot from the second side.
See "SPARC: Booting a System (Tasks)" in System Administration Guide: Basic Administration
Working with Submirrors
How to Attach a Submirror
Identify the component (concatenation or stripe) to be used as a submirror.
It must be the same size (or larger) as the existing submirror in the mirror. If you have not yet created a volume to be a submirror, see "Creating RAID 0 (Stripe) Volumes" or "Creating RAID 0 (Concatenation) Volumes".
Make sure that you have root privilege and that you have a current backup of all data.
Use one of the following methods to attach a submirror.
From the Enhanced Storage tool within the Solaris Management Console, open the Volumes node, choose the mirror, then choose Action->Properties and click the Components tab. Follow the instructions on screen. For more information, see the online help.
Use the metattach mirror submirror command.
# metattach mirror submirror
See the metattach(1M) man page for more information.
Example--Attaching a Submirror
# metastat d30
d30: mirror
Submirror 0: d60
State: Okay
...
# metattach d30 d70
d30: submirror d70 is attached
# metastat d30
d30: mirror
Submirror 0: d60
State: Okay
Submirror 1: d70
State: Resyncing
Resync in progress: 41 % done
Pass: 1
Read option: roundrobin (default)
Write option: parallel (default)
Size: 2006130 blocks
...
|
This example shows the attaching of a submirror, d70, to a one-way mirror, d30, creating a two-way mirror. The mirror d30 initially consists of submirror d60. The submirror d70 is a RAID 0 volume. You verify that the status of the mirror is "Okay" with the metastat command, then attach the submirror. When the metattach command is run, the new submirror is resynchronized with the existing mirror. When you attach an additional submirror to the mirror, the system displays a message. To verify that the mirror is resynchronizing, use the metastat command.
How to Detach a Submirror
Make sure that you have root privilege and that you have a current backup of all data.
Use one of the following methods to detach a submirror.
From the Enhanced Storage tool within the Solaris Management Console, open the Volumes node, choose the mirror, then choose Action->Properties and click the Components tab. Follow the instructions on screen. For more information, see the online help.
Use the metadetach command to detach a submirror from a mirror.
# metadetach mirror submirror
See the metadetach(1M) man page for more information.
Example--Detaching a Submirror
# metastat
d5: mirror
Submirror 0: d50
...
# metadetach d5 d50
d5: submirror d50 is detached
|
In this example, mirror d5 has a submirror, d50, which is detached with the metadetach command. The underlying slices from d50 are going to be reused elsewhere. When you detach a submirror from a mirror, the system displays a confirmation message.
How to Place a Submirror Offline and Online
The metaonline command can only be used when a submirror was taken offline by the metaoffline command. After the metaonline command runs, Solaris Volume Manager automatically begins resynchronizing the submirror with the mirror.
Note - The metaoffline command's capabilities are similar to that offered by the metadetach command. However, the metaoffline command does not sever the logical association between the submirror and the mirror.
Make sure that you have root privilege and that you have a current backup of all data.
Use one of the following methods to place a submirror online or offline.
From the Enhanced Storage tool within the Solaris Management Console, open the Volumes node, choose the mirror, then choose Action->Properties and click the Components tab. Follow the instructions on screen. For more information, see the online help.
Use the metaoffline command to take offline a submirror.
# metaoffline mirror submirror
See the metaoffline(1M) man page for more information.
Use the metaonline command to bring a submirror online.
# metaonline mirror submirror
See the metaonline(1M) man page for more information.
Example--Placing a Submirror Offline
# metaoffline d10 d11 d10: submirror d11 is offlined |
In this example, submirror d11 is taken offline from mirror d10. Reads will continue to be made from the other submirror. The mirror will be out of sync as soon as the first write is made. This inconsistency is corrected when the offlined submirror is brought back online.
Example--Placing a Submirror Online
# metaonline d10 d11 d10: submirror d11 is onlined |
In this example, submirror d11 is brought back online in mirror d10.