Administrator's Guide

Creating Cleartext Backup Media (LVM Mirrored Volumes)
If you have mirrored LVM volumes, you can create cleartext backup media using the procedure
described in “Creating Encrypted Backup Media on a Second EVFS Volume Using a Block Device
Utility (LVM Mirrored Volumes)” (page 107) or “Creating Encrypted Backup Media on a Second
EVFS Volume Using a File Utility (LVM Mirrored Volumes)” (page 109). However, instead of
using a second EVFS volume as the target for the backup utility, use a non-EVFS device as the
target. In both cases, the source EVFS volume is enabled when you execute the backup utility,
so the backup utility receives the data in cleartext.
Example: Block Device Utility
In the following example, the administrator splits the /dev/vg01/lvol5 mirror volume and
creates the /dev/vg01/lvol5backupvolume. The target is the /dev/rmt/0m tape device.
The dd command receives cleartext from the source EVFS volume.
# lvsplit –s backup /dev/vg01/lvol5 (LVM creates the /dev/vg01/lvol5backup volume.)
# evfsvol map /dev/vg01/lvol5backup
# evfsvol check -r /dev/evfs/vg01/lvol5backup
# evfsvol enable -k mykey /dev/evfs/vg01/lvol5backup (evfsvol prompts for
a passphrase if there is no stored passphrase.)
# dd bs=64k if=/dev/evfs/vg01/lvol5backup of=/dev/rmt/0m
# evfsvol disable -k mykey /dev/evfs/vg01/lvol5backup (evfsvol prompts for
a passphrase if there is no stored passphrase.)
# evfsadm unmap /dev/evfs/vg01/lvol5backup
# lvmerge /dev/vg01/lvol5backup /dev/vg01/lvol5
Example: File Utility
In the following example, the administrator splits the /dev/vg01/lvol5 mirror volume, creates
the /dev/vg01/lvol5backup volume, and mounts the file system on
/opt/evfs/backup_source. The target is the non-encrypted directory
/opt/foo/backup_target. The cp command receives cleartext from the source EVFS volume.
# lvsplit –s backup /dev/vg01/lvol5 (LVM creates the /dev/vg01/lvol5backup volume.)
# evfsvol map /dev/vg01/lvol5backup
# evfsvol check -r /dev/evfs/vg01/lvol5backup
# evfsvol enable -k mykey /dev/evfs/vg01/lvol5backup (evfsvol prompts for
a passphrase if there is no stored passphrase.)
# fsck -F vxfs /dev/evfs/vg01/lvol5backup
# mkdir /opt/evfs/backup_source
# mount -F vxfs /dev/evfs/vg01/lvol5/backup /opt/evfs/backup_source
# cp -r /opt/evfs/backup_source /opt/foo/backup_target
# umount /opt/evfs/backup_source
# evfsvol disable -k mykey /dev/evfs/vg01/lvol5backup (evfsvol prompts for
a passphrase if there is no stored passphrase.)
# evfsadm unmap /dev/evfs/vg01/lvol5backup
# lvmerge /dev/vg01/lvol5backup /dev/vg01/lvol5
Backing Up EVFS Volumes 111