05-08-2012
Use Live Upgrade, is much easier...
With SVM still you can offline a leg of the mirror and then mount it as RO. So you wont be able to patch it. It is generally used to perform backups on live systems with minimal impact on the performance. then you have to sync the mirrors back again.
What you could do is split the mirror , fsck the slices from the inactive metadevices and verify that everything is ok. Patch the OS and if something goes wrong just boot from the leg you detached earlier... pretty much the same thing you could do with Live Upgrade but manually... hence... do it with Live Upgrade.
Live upgrade has many many options for different scenarios... just look the one fits better to you. You can find the full documentation with examples at Oracle site under the reference manual section.
Cheers
Juan
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LEARN ABOUT NETBSD
fssconfig
FSSCONFIG(8) BSD System Manager's Manual FSSCONFIG(8)
NAME
fssconfig -- configure file system snapshot devices
SYNOPSIS
fssconfig [-cxv] device path backup [cluster [size]]
fssconfig -u [-v] device
fssconfig -l [-v] [device]
DESCRIPTION
The fssconfig command configures file system snapshot pseudo disk devices. It will associate the file system snapshot disk device with a
snapshot of path allowing the latter to be accessed as though it were a disk.
If backup resides on the snapshotted file system a persistent snapshot will be created. This snapshot is active until backup is unlinked.
This snapshot mode is only supported for ffs files systems.
Otherwise data written through the path will be saved in backup. If backup is a regular file, it will be created with length size. Default
size is the size of path. Data is saved to backup in units of cluster bytes.
Options indicate an action to be performed:
-c Configures the device. If successful, references to device will access the contents of path at the time the snapshot was taken. If
backup is a directory, a temporary file will be created in this directory. This file will be unlinked on exit.
-l List the snapshot devices and indicate which ones are in use. If a specific device is given, then only that will be described.
-u Unconfigures the device.
-v Be more verbose listing the snapshot devices.
-x Unlink backup after the device is configured.
If no action option is given, -c is assumed.
FILES
/dev/rfss?
/dev/fss?
EXAMPLES
fssconfig fss0 /usr /tmp/back
Configures the snapshot device fss0 for a snapshot of the /usr file system. Data written through /usr will be backed up in /tmp/back.
fssconfig fss1 / /dev/rsd0e 8192
Configures the snapshot device fss1 for a snapshot of the / file system. Data written through / will be backed up in /dev/rsd0e. The backup
will take place in units of 8192 bytes.
fssconfig -u fss0
Unconfigures the fss0 device.
SEE ALSO
opendisk(3), fss(4), mount(8), umount(8)
HISTORY
The fssconfig command appeared in NetBSD 2.0.
BSD
June 11, 2012 BSD