clonefset(8) System Manager's Manual clonefset(8)
NAME
clonefset - Creates a read-only copy of an AdvFS fileset
SYNOPSIS
/usr/sbin/clonefset domain fileset clonename
OPERANDS
Specifies the name of an existing AdvFS file domain. Specifies the name of the original fileset that the clonefset utility will clone.
Specifies the name of the read-only fileset created by the clonefset utility.
DESCRIPTION
The clonefset utility enables you to perform online backups of active files by making a read-only copy (clone) of an active fileset. Once
you create and mount a clone fileset, you can back up the clone using the vdump command or other supported backup utility (the dump command
is not supported by AdvFS). Note that the clonefset utility only clones AdvFS filesets; it does not clone UFS file systems.
A clone fileset is a read-only snapshot of fileset data structures (metadata). When you clone a fileset, the utility copies only the
structure of the original fileset, not its data. When you modify files in the original fileset, the file system copies the original pages
to the clone fileset. In this way, the clone fileset contents remain the same as when you first created it.
You can create new versions of a clone fileset, but you can maintain only one clone per fileset at a time. You cannot rename a clone file-
set, but there is a workaround. You can remove an existing clone fileset (and all its files) by using the rmfset command, then create a new
one with the new name.
RESTRICTIONS
Each fileset within a domain must have a unique name of up to 31 characters. All whitespace characters (tab, new line, space, and so
forth) and the / # : * ? characters are invalid for fileset names.
Do not create a clone fileset if the available disk space for the file domain is less than 5 percent of the total. When a file domain runs
out of disk space, the file system loses its ability to maintain the consistency of files within clone filesets. When the file system can
no longer maintain consistency, it displays warning messages similar to the following on the user's terminal and to the console: WARNING:
advfs cannot copy-on-write data to a clone file. WARNING: encountered the following error: ENO_MORE_BLKS (-1040) WARNING: do not continue
using the clone fileset. WARNING: original file set: name=mnt, id=2c06a73f.00027192.00000001.8001 WARNING: clone file set: name=clone,
id=2c06a73f.00027192.00000002.8002 WARNING: file id = 0000000a.8002
This message also appears in the /var/adm/syslog.dated/latest_boot_date/kern.log file.
EXAMPLES
The following example creates a read-only copy of the credit_fs fileset that resides in the accounts_dmn file domain. The clone fileset
name in this example is credit_clone1. This example also performs an online backup and removes the clone fileset after the backup is com-
plete: # mkdir /mnt/credit_clone1 # clonefset accounts_dmn credit_fs credit_clone1 # mount -t advfs account_dmn#credit_clone1
/mnt/credit_clone1 # vdump /mnt/credit_clone1 # umount /mnt/credit_clone1 # rmfset account_dmn credit_clone1
SEE ALSO
Commands: tar(1), showfdmn(8), vdump(8), vrestore(8)
Functions: advfs_clonefset(3)
File Formats: advfs(4)
clonefset(8)