IBM Systems Magazine, Power Systems - July 2014 - 9

Figure 1: Empty Space and User Data
back to a system with no operating system, changes in hardware
or disk sizes and the challenge
of multiple disks. To solve those
issues, file-based system backup
utilities were created, including
mksysb (AIX*), Ignite (HP-UX)
and Flash Archive (Solaris). With
a file-based archive, you have the
flexibility to recover the entire
system to differently sized disks
or different hardware. File-based
backups also allow individual file
restores rather than the all-ornothing disk-image approach.

Virtualization
and Snapshots
Storix recently conducted a
survey of Linux*/UNIX* systems
administrators, and more than
75 percent reported that their
production systems will be virtualized by 2015. The most common
forms of virtualization for these
systems are VMware for Linux and
the IBM PowerVM* solution for
AIX and Linux on Power*.
Virtual machines (VMs) run off
of virtual disks, which are large
files made to look like disks to
the operating system. This leads
many administrators to ask, "Why
create a backup of all of the files
on the VM when I can just make
a backup of the virtual disk that
contains everything?" Since it's
not advisable to back up a disk file
while running, a snapshot copy is
created so the virtual disk files can
be backed up in a consistent state.
This process is typically called
snapshot backups.
History has repeated itself
when it comes to BMR techniques
and many systems administrators
have fallen back into the old trap
of backing up everything without
regard to how it will be restored.
In theory, an organization should
be able to copy the virtual disk
images back to the virtual host
and boot the VM. In practice,
however, snapshots have reintroduced problems that were solved

long ago by file-based backup solutions-mainly the
flexibility to restore individual files, the capability to
restore to differently sized disks and the capability to
selectively back up just the operating system.

Individual File Restores
One of the most important aspects of a backup and
recovery strategy is the capability to recover individual files. Enterprise environments rely on file-based
data backup management software such as Tivoli*
Storage Manager (TSM) to handle data backups.
TSM is designed to catalog backup data for quick
and easy file restores. When attempting to recover
individual files from a snapshot image, you first need
to restore the virtual disk image to a location, then
mount it as a separate disk or spin it up as a new
VM. Once you remount the disk file, you can search
for the files you need. This can take hours and adds
complexity many backup administrators can't tolerate. Many IT shops use an enterprise data backup
product like TSM for the VM user data and then take
snapshot backups to capture the operating system
and configuration.

Wasted Storage and Wasted Time
To the operating system, a VM disk is just like
any other disk. Portions of the disk are taken up
by the OS, application data, user data and empty
space (see Figure 1, above). As mentioned, most IT
shops are already using a separate backup product for the user data, but still need a backup of
the OS, like a traditional AIX mksysb, to do BMR.
Because VM snapshot backups are all or nothing,
administrators are left to store and manage large
disk images just to keep the small portion that
contains the OS.
When using a file-based BMR product, you can
choose to back up just the OS and any data not
being backed up by your enterprise data management product. This reduces the amount of off-site
storage and makes the backup and recovery go
much faster.
Consider the recovery of a VM snapshot with data
backups from TSM:

ĀÃ 7UDQVIHUÃWKHÃHQWLUHÃVQDSVKRWÃ
image from tape or over the
network to a pre-configured
hypervisor (hours)
ĀÃ 3RZHUÃRQÃWKHÃ90ÃVHFRQGV
ĀÃ 5HFRYHUÃWKHÃPRVWÃUHFHQWÃ760Ã
backup if newer than the snapshot (hours again)
Now consider the recovery using
a file-based BMR product with an
OS-only backup:
ĀÃ &UHDWHÃDQGÃSRZHUÃRQÃDÃ90ÃRUÃ
power on a physical machine
(minutes)
ĀÃ 5HVWRUHÃWKHÃ26ÃEDFNXSÃPLQXWHV
ĀÃ 5HFRYHUÃWKHÃPRVWÃUHFHQWÃ760Ã
backup data (hours)
The significant reduction in
your RTO comes from not having
to copy over a large disk image
that holds empty space or data
that will be overwritten anyway.
File-based BMR has the added
benefit of being able to restore the
VM back to physical hardware or
a different virtualization environment (e.g., VMware to KVM).

Flexibility and Granularity
When planning your backup
and BRM strategies, keep in
mind the need for flexibility and
granularity. If you're currently
creating snapshot backups for
VMs, or your VM backup product
is not file-based, try some realworld recovery tests. You may
be surprised.
Remember, just because you
backed everything up doesn't
mean you can recover it.
ibmsystemsmag.com JULY 2014 // 9


http://www.ibmsystemsmag.com

IBM Systems Magazine, Power Systems - July 2014

Table of Contents for the Digital Edition of IBM Systems Magazine, Power Systems - July 2014

Table of Contents
Editor's Desk: Black thumb
IBM Perspective: Open innovation at its best
Techbits: Watson: your personal shopper
Partner PoV: Your business continuity strategy should focus on recovery, not just backups
Trends: IBM Design brings the best minds from engineering and design to create products that delight users
Cover Story: A Growing Proposition: Roundtable reveals Linux is flourishing on Power Systems
Feature: The Wave of the Future: IBM floods the Linux market with options
Tech Showcase: Why updating applications makes good business sense
Focus on Storage: IBM FlashSystem addresses storage and application performance issues
Open Source: Choosing the best proprietary or open-source applications
Solutions: Galileo Performance Explorer; Power Systems Navigator; X-Analysis V10; Robot/NETWORK Web UI; SafeNet/i 10.11; Reflection 2014; KeyesOverlay and kLink; RSF and RSF-HA 10.0
Snapshot: Randy Wittner
Reference Point - Global Events, Education, Resources for Power Systems
2014 Power Systems Solution Edition Product Index
IBM Systems Magazine, Power Systems - July 2014 - Intro
IBM Systems Magazine, Power Systems - July 2014 - Cover1
IBM Systems Magazine, Power Systems - July 2014 - Cover2
IBM Systems Magazine, Power Systems - July 2014 - 1
IBM Systems Magazine, Power Systems - July 2014 - Table of Contents
IBM Systems Magazine, Power Systems - July 2014 - 3
IBM Systems Magazine, Power Systems - July 2014 - 4
IBM Systems Magazine, Power Systems - July 2014 - Editor's Desk: Black thumb
IBM Systems Magazine, Power Systems - July 2014 - IBM Perspective: Open innovation at its best
IBM Systems Magazine, Power Systems - July 2014 - Techbits: Watson: your personal shopper
IBM Systems Magazine, Power Systems - July 2014 - Partner PoV: Your business continuity strategy should focus on recovery, not just backups
IBM Systems Magazine, Power Systems - July 2014 - 9
IBM Systems Magazine, Power Systems - July 2014 - Trends: IBM Design brings the best minds from engineering and design to create products that delight users
IBM Systems Magazine, Power Systems - July 2014 - 11
IBM Systems Magazine, Power Systems - July 2014 - 12
IBM Systems Magazine, Power Systems - July 2014 - 13
IBM Systems Magazine, Power Systems - July 2014 - Cover Story: A Growing Proposition: Roundtable reveals Linux is flourishing on Power Systems
IBM Systems Magazine, Power Systems - July 2014 - 15
IBM Systems Magazine, Power Systems - July 2014 - 16
IBM Systems Magazine, Power Systems - July 2014 - 17
IBM Systems Magazine, Power Systems - July 2014 - 18
IBM Systems Magazine, Power Systems - July 2014 - 19
IBM Systems Magazine, Power Systems - July 2014 - Feature: The Wave of the Future: IBM floods the Linux market with options
IBM Systems Magazine, Power Systems - July 2014 - 21
IBM Systems Magazine, Power Systems - July 2014 - 22
IBM Systems Magazine, Power Systems - July 2014 - 23
IBM Systems Magazine, Power Systems - July 2014 - 24
IBM Systems Magazine, Power Systems - July 2014 - 25
IBM Systems Magazine, Power Systems - July 2014 - 26
IBM Systems Magazine, Power Systems - July 2014 - Tech Showcase: Why updating applications makes good business sense
IBM Systems Magazine, Power Systems - July 2014 - 28
IBM Systems Magazine, Power Systems - July 2014 - 29
IBM Systems Magazine, Power Systems - July 2014 - 30
IBM Systems Magazine, Power Systems - July 2014 - 31
IBM Systems Magazine, Power Systems - July 2014 - 32
IBM Systems Magazine, Power Systems - July 2014 - 33
IBM Systems Magazine, Power Systems - July 2014 - 34
IBM Systems Magazine, Power Systems - July 2014 - 35
IBM Systems Magazine, Power Systems - July 2014 - 36
IBM Systems Magazine, Power Systems - July 2014 - 37
IBM Systems Magazine, Power Systems - July 2014 - Focus on Storage: IBM FlashSystem addresses storage and application performance issues
IBM Systems Magazine, Power Systems - July 2014 - 39
IBM Systems Magazine, Power Systems - July 2014 - 40
IBM Systems Magazine, Power Systems - July 2014 - 41
IBM Systems Magazine, Power Systems - July 2014 - Open Source: Choosing the best proprietary or open-source applications
IBM Systems Magazine, Power Systems - July 2014 - 43
IBM Systems Magazine, Power Systems - July 2014 - 44
IBM Systems Magazine, Power Systems - July 2014 - Solutions: Galileo Performance Explorer; Power Systems Navigator; X-Analysis V10; Robot/NETWORK Web UI; SafeNet/i 10.11; Reflection 2014; KeyesOverlay and kLink; RSF and RSF-HA 10.0
IBM Systems Magazine, Power Systems - July 2014 - 46
IBM Systems Magazine, Power Systems - July 2014 - 47
IBM Systems Magazine, Power Systems - July 2014 - Snapshot: Randy Wittner
IBM Systems Magazine, Power Systems - July 2014 - Cover3
IBM Systems Magazine, Power Systems - July 2014 - Cover4
IBM Systems Magazine, Power Systems - July 2014 - Reference Point - Global Events, Education, Resources for Power Systems
IBM Systems Magazine, Power Systems - July 2014 - 2014 Power Systems Solution Edition Product Index
IBM Systems Magazine, Power Systems - July 2014 - SE2
IBM Systems Magazine, Power Systems - July 2014 - SE3
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