Dell PowerVault DL2200 CommVault - Manual (Page 4)

49 DELL.COM/PowerSolutions Reprinted from Dell Power Solutions, September 2009. Copyright © 2009 Dell Inc. All rights reserved.
The workflow on the right illustrates
the advantages of the BLI approach. In
this case, the first full backup transfers
the equivalent of 1 TB of data. Then, even
assuming a high daily change rate of
25 percent, subsequent backup jobs
incrementally transfer changed segments
equivalent to 0.25 TB each day. Assuming
a typical software compression of 50 per-
cent, the 2–3 TB target can easily accom-
modate 10–14 days’ worth of recovery
copies. Adding built-in, in-stream, block-
level deduplication would help reduce
the volume of data transfer and increase
disk utilization even further. With common
workloads, and assuming a low 3:1 dedu-
plication ratio, this solution can easily
support 30 days’ worth of backups on
disk, helping meet the 30-day RPO for
rapid recovery.
enabling rapiD Data
recovery
Administrators often struggle to find the
right balance between disaster recovery
and granular recovery policies at accept-
able performance levels. For example, as
shown in Figure 2, a lack of incremental
backup capability can quickly force data to
tape. In this case, recovering files older than
two or three days would require staging an
entire VM image on disk—a process that
could potentially take hours, defeating the
purpose of granular recovery. Administrators
face a difficult trade-off: investing in a large
disk target to help maintain acceptable
granular recovery performance, or using
cost-effective tape media that can com-
promise recovery speed and SLAs.
The CommVault Simpana UVSA helps
eliminate this decision. By enabling
administrators to maintain a B2D capacity
comparable to that required in a pre-
virtualization environment while still
meeting RPOs, it helps avoid the need to
push data off to tape media and supports
rapid granular recovery.
Deploying Flexible Data
protection For vms
Although virtualization can provide a
range of benefits in enterprise data cen-
ters, continuing to use legacy backup
tools not designed for these types of envi-
ronments can lead to increased storage
costs for data retention and slow, inflex-
ible recovery. CommVault Simpana offers
next-generation data protection designed
for virtualization—helping organizations
keep pace with the emerging challenges
of disparate systems, rapid data growth,
shrinking operational windows, and tight-
ened recovery objectives.
Brian Brockway is vice president of prod-
uct management at CommVault, and has
over 10 years of experience in the software
and storage industry. He has a B.S. in
Aerospace Engineering from the University
at Buffalo and an M.B.A. from New York
University.
Zahid Ilkal is a senior product manager
at CommVault, and has over 10 years of
experience in the storage industry. He has
a master’s degree in Computer Science
from the University of Pune and an M.B.A.
from New York University.
Dell PowerVault DL 2000
(VCB proxy)
App
OS
App
OS
App
OS
App
OS
App
OS
VM pool
VMware ESX server
Data store Legacy
backup software
CommVault
Simpana UVSA
VCB staging
200 GB (maximum of 10 VMs)
Disk media set
(all 30 days in
deduplicated form)
VCB staging
200 GB (maximum of 10 VMs)
Disk media set
(last 2 days)
Full transfer
every job
(no incremental
backups)
2 TB
0.5 TB
Granular
restore
Tape media set
(previous 28 days)
28 TB
Incremental 25% transfer
of changed blocks after
initial full backup
2-3 TB
Quick linkS
Dell and CommVault:
DELL.COM/CommVault
Dell PowerVault DL2000:
DELL.COM/DL2000
Figure 2. Block-level incremental backup helps reduce storage requirements and accelerate recovery