Storage conSolidation with the dell PowerVault Md3000i iScSi array

Storage conSolidation with the dell PowerVault Md3000i iScSi array
feature section:
new horizons in enterprise Storage
Storage consolidation
with the Dell
PowerVault Md3000i
iSCSI Array
By Dave Jaffe, Ph.D.
Kendra Matthews
E
Related Categories:
The Dell™ PowerVault™ MD3000i Internet SCSI (iSCSI) array
enables enterprises to easily consolidate storage for multiple servers. To illustrate its performance in a consolidated
environment, Dell engineers performed tests demonstrating that the PowerVault MD3000i provides sufficient
throughput to handle five server workloads as well as two
incremental backups over an eight-hour period.
nterprises continue to look for cost-effective ways to
steps for resolution. Optional snapshot and virtual disk copy
streamline their IT infrastructure and optimize data
features that support real-time backups of the entire data envi-
management. Although storage consolidation
ronment are designed to enhance data protection.
through the deployment of a storage area network (SAN)
To help provide high availability, the PowerVault MD3000i
helps increase utilization and simplify management, in the
supports redundant active/active controllers, management
past, this approach has typically required an investment in
ports, and power and cooling systems designed to increase
a Fibre Channel infrastructure. Today, Internet SCSI (iSCSI)
resiliency at the hardware level, and can automatically
offers an alternative by allowing the transmission of data
rebuild a failed drive using a global hot-spare drive.
packets over standard Ethernet networks, enabling enter-
To help demonstrate how the PowerVault MD3000i per-
Dell Enterprise Technology Center
prises to take advantage of existing networking expertise
forms in a consolidated environment, in September 2007 Dell
Dell PowerVault storage
and equipment to help simplify SAN implementation and
engineers placed the application data for five Dell PowerEdge™
reduce barriers to wide-scale consolidation.
servers on a single PowerVault MD3000i array with two
Internet SCSI (iSCSI)
The Dell PowerVault MD3000i is an iSCSI-based modu-
PowerVault MD1000 expansion enclosures, then simulated a
lar disk storage array that can consolidate up to 16 hosts,
typical workday by running five separate workloads—two
Storage
expands to support up to 18 TB of data, and provides
nodes of a fully redundant Microsoft® Exchange cluster, a
Storage consolidation
wizard-based installation, intuitive management, and
Web-serving application, a Microsoft SQL Server™ database,
advanced data protection software. Its modular expand-
and file-serving data transfers—during an eight-hour period.
ability provides the flexibility to add capacity as needed:
In addition, the test team performed two incremental backups
the storage array itself can house up to fifteen 3.5-inch
using Symantec Backup Exec 11d for Windows Servers during
Serial Attached SCSI (SAS) disk drives, and can easily be
this eight-hour simulation. As the results show, the PowerVault
expanded to up to 45 drives by adding up to two PowerVault
MD3000i provided sufficient throughput to handle the I/O
MD1000 expansion enclosures.
from all of these workloads.
Microsoft Exchange Server 2007
Visit DELL.COM/PowerSolutions
for the complete category index.
The array delivers a seamless suite of intuitive, intelligent
Storage Manager can automatically configure the system for
Dell PowerVault MD3000i features
and test configuration
optimal performance and availability. The Recovery Guru tool
Figure 1 summarizes the key hardware features of the
can diagnose system problems and help determine appropriate
PowerVault MD3000i. The array includes one or two embedded
storage management software capabilities. Dell Modular Disk
22
DELL POWER SOLUTIONS | November 2007
Reprinted from Dell Power Solutions, November 2007. Copyright © 2007 Dell Inc. All rights reserved.
Figure 5 summarizes the disk configuration
Available drives
15,000 rpm SAS drives available in 36 GB, 73 GB, 146 GB,
or 300 GB capacities, and 10,000 rpm SAS drives available
in 146 GB, 300 GB, or 400 GB capacities*
Rack size (including one enclosure with 15 disks)
3U
RAID cache size
512 MB per controller
Maximum number of disks (including two Dell
PowerVault MD1000 expansion enclosures)
45
List price of tested configuration with three-year
Gold-level support**
US$45,908
*For hard drives, GB means 1 billion bytes; actual capacity varies with preloaded material and operating environment and will be less.
**Price given as of October 4, 2007.
used in the Dell tests. In addition to creating the
application data LUNs described in the preceding sections, the test team assigned disk 0 in
enclosure 0 as a hot spare for the entire array
and created a 10-disk RAID-10 snapshot repository on enclosures 1 and 2 to help protect
against disk and enclosure failures.
Figure 6 illustrates the test configuration.
The servers were connected to the PowerVault
MD3000i array by two subnets, 10.10.20 and
10.10.22, using the Microsoft iSCSI Software
Initiator to provide multiple connection paths for
Figure 1. Key hardware features of the Dell PowerVault MD3000i iSCSI storage array
load balancing and failover. For simplicity, the
PowerEdge 1950 also hosted the Dell Modular
iSCSI controllers, each of which includes two
adding those servers to the host topology. After
Disk Storage Manager management console for
Gigabit Ethernet iSCSI ports as well as an
creating a LUN, they can use the iSCSI initiator
the PowerVault MD3000i. (Typically, the man-
Ethernet management port and a SAS expan-
for the host OS (such as the Microsoft iSCSI
agement server is on a separate network from
sion port. In the Dell tests, the test team used
Software Initiator used in the Dell tests) to con-
the dedicated iSCSI networks.) Because the
a PowerVault MD3000i with two controllers and
figure a multipath connection to the LUN for
server running Symantec Backup Exec 11d
three enclosures containing a total of forty-five
load balancing and failover.1 Figure 4, for exam-
created incremental backups from the passive
146 GB, 15,000 rpm SAS drives.
ple, shows the servers that had access to the
Exchange node, it did not need to be connected
PowerVault MD3000i during the Dell tests.
directly to the PowerVault MD3000i.
Administrators can install Dell Modular Disk
Storage Manager on a server connected to the
same network as the array’s Ethernet management port. They can then use this tool to create
virtual disks—also known as storage logical units
(LUNs)—and make them accessible to specific
hosts. The Summary tab in Dell Modular Disk
Storage Manager provides an overview of hosts
and virtual disks as well as current storage array
status (see Figure 2). The Tools tab allows administrators to set the array name and the IP address
of the management port, and the iSCSI tab allows
them to manage iSCSI settings such as the IP
addresses of the four iSCSI ports, authentication, and target discovery (see Figure 3). The
Configure Host Access (Manual) function in the
Configure tab enables administrators to give a
host server access to LUNs on the array, and the
Edit Host Topology function in the Modify tab
enables them to add the iSCSI initiator for each
host (see Figure 4).
Administrators can create LUNs to hold host
servers’ application data either before or after
1
Figure 2. Summary tab in Dell Modular Disk Storage Manager
For details on configuring a multipath connection on the Dell PowerVault MD3000i with Microsoft Multipath I/O, visit www.delltechcenter.com/page/MPIO+to+PowerVault+MD3000i+with+Microsoft+iSCSI+Initiator.
Reprinted from Dell Power Solutions, November 2007. Copyright © 2007 Dell Inc. All rights reserved.
DELL.COM/PowerSolutions
23
feature section:
new horizons in enterprise Storage
Figure 3. iSCSI tab in Dell Modular Disk Storage Manager
Test workloads
Figure 4. Edit Host Topology screen in the Modify tab of Dell Modular
Disk Storage Manager
Microsoft Exchange Server 2007. The test
two four-disk RAID-5 data LUNs for the active
The Dell tests used five primary servers with
team installed Exchange Server 2007 with clus-
node on enclosure 0, and a similar set of LUNs
application data consolidated on the
ter continuous replication (CCR) on two
for the passive node on enclosure 1. (Full fault
PowerVault MD3000i: two servers running the
PowerEdge 1955 server blades, with one blade
tolerance would require the passive node’s
Microsoft Exchange Server 2007 application,
serving as the active node and the other serv-
LUNs to be on a separate storage array
one acting as a Web server, one running the
ing as the passive node. CCR ships transaction
altogether.)
Microsoft SQL Server 2005 database platform,
logs from the active node to the passive node,
The test team used the Microsoft Exchange
and one acting as a file server. A separate
helping keep the two nodes synchronized. If
Load Generator (LoadGen) tool to simulate the
server running Symantec Backup Exec 11d
the active node fails, the Exchange users auto-
Exchange workload. LoadGen simulates e-mail
functioned as a backup system for the
matically fail over to the passive node. The test
users and is typically run over an eight-hour
Exchange database.
team created one two-disk RAID-1 log LUN and
period to simulate a complete workday. It comes
with several default profiles; the test team used
Enclosure
0
0
1
2
the heavy user profile, where each user aver-
Disks
1–4
Hot spare
Available
Files
(RAID-1)
Snapshot LUN (RAID-10)
Snapshot LUN (RAID-10)
5–6
7–10
11–14
Microsoft Exchange
active log LUN
(RAID-1)
Microsoft Exchange
active data LUN 1
(RAID-5)
Microsoft Exchange
active data LUN 2
(RAID-5)
Microsoft Exchange
passive log LUN
(RAID-1)
Microsoft Exchange
passive data LUN 1
(RAID-5)
Microsoft Exchange
passive data LUN 2
(RAID-5)
Microsoft SQL Server
log LUN for Web
server (RAID-1)
Microsoft
SQL Server data
LUN 1 for Web
server (RAID-5)
Microsoft SQL Server
data LUN 2 for Web
server (RAID-5)
Microsoft SQL Server
log LUN (RAID-1)
Microsoft SQL
Server data LUN 1
(RAID-5)
Microsoft SQL Server
data LUN 2 (RAID-5)
ages 46 actions per day. LoadGen reports
results in terms of average latency for each type
of e-mail operation.
Web serving. To provide a Web-serving
application, the test team used an ASP.NET–
based Web application from the Dell DVD Store
kit running under Microsoft Internet Information
Services (IIS) in front of a SQL Server database,
with both IIS and SQL Server running on a third
PowerEdge 1955 server blade. The Dell DVD
Store application provides a comprehensive set
of login, search, and purchase screens for the
simulated online store. The complete applica-
Figure 5. Disk configuration used in the test environment
24
DELL POWER SOLUTIONS | November 2007
tion code is freely available for public use
Reprinted from Dell Power Solutions, November 2007. Copyright © 2007 Dell Inc. All rights reserved.
under the GNU General Public License (GPL) at
linux.dell.com/dvdstore. The test team used a
separate Web driver program from the DVD
Store kit to simulate multiple users searching
for and ordering DVDs from their Web browsers
throughout the test. The back-end SQL Server
database for this application used the large
version of the DVD Store database (over 100 GB
of data) and utilized one two-disk RAID-1 log
LUN and two four-disk RAID-5 data LUNs.
Microsoft SQL Server 2005. The SQL Server
2005 workload also utilized the Dell DVD Store
database, but without the Web interface. The
test team installed SQL Server on a fourth
PowerEdge 1955 server blade and built the large
version of the DVD Store database on one twodisk RAID-1 log LUN and two four-disk RAID-5
data LUNs on the same disk group as the Dell
Figure 7. Symantec Backup Exec 11d showing two incremental backups performed in the test
environment
DVD Store database used for the Web-serving
application. Consequently, the same set of 10
the store; searching for DVDs by actor, title, or
They assigned a drive letter to this LUN and shared
disks was used simultaneously by two 100 GB
category; and purchasing DVDs.
it as a Windows Server 2003 file share, then
databases during the eight-hour duration of the
File serving. To provide a file-serving work-
copied a set of 41 files, with sizes varying from
test. The test team used the SQL Server driver
load, the test team created a two-disk RAID-1 LUN
1 MB to 3 GB, to it. They then mounted this file
program included with the DVD Store kit to
and assigned it to a PowerEdge 1950 server run-
share on another PowerEdge 1950 server using
simulate a constant load of users logging in to
ning the Microsoft Windows Server® 2003 OS.
the standard Map Network Drive function in
Microsoft Windows® Explorer. To simulate use of
this file share, the test team used a simple command-line shell script to copy files back and forth
between this server and the file share. Two scripts
Disk or tape
ran in parallel during the eight-hour duration of
the test, with delays placed in the scripts so that
Web serving
each copied approximately 40 files per hour.
Microsoft SQL Server 2005
Microsoft Exchange Server 2007 (active node)
Microsoft Exchange Server 2007 (passive node)
Symantec Backup Exec 11d
Dell PowerEdge 1950
Symantec Backup Exec 11d. The test team
10.10.20
subnet
used Symantec Backup Exec 11d, which enables
fast, comprehensive backup and recovery
10.10.22
subnet
using disk or tape, to back up the Exchange
database to a PowerEdge 1950 server.2 After
Dell PowerVault MD3000i
with two PowerVault MD1000
expansion enclosures
Test workloads
Dell PowerEdge 1955 server blades
Backup Exec 11d has performed a full backup
of an Exchange database, it uses incremental
backups from the passive node of the Exchange
cluster to avoid affecting active Exchange
users. The test team performed incremental
File serving
Dell PowerEdge 1950
backups with Backup Exec 11d at times corresponding to 11:30 a.m. and 3:30 p.m. during the
simulated day (the two backups dated
Figure 6. Hardware configuration used in the test environment
2
September 12, 2007, in Figure 7.)
For more information, see “Protecting Critical Enterprise Applications with Symantec Backup Exec 11d,” by Charles Butler, in Dell Power Solutions, May 2007, DELL.COM/downloads/global/power/ps2q07-20070408-Symantec.pdf.
Reprinted from Dell Power Solutions, November 2007. Copyright © 2007 Dell Inc. All rights reserved.
DELL.COM/PowerSolutions
25
feature section:
new horizons in enterprise Storage
“ By
Test results: Total work and data transfer
The test team ran the Microsoft Exchange
providing simple, cost-effective iSCSI storage
along with a single easy-to-use management interface
Server 2007, Web serving, Microsoft SQL
Server 2005, and file-serving workloads for
and optional integrated snapshot and virtual disk copy
eight hours to represent a workday running
from 8 a.m. to 4 p.m., and performed two incre-
functionality, the PowerVault MD3000i enables enter-
mental backups with Symantec Backup Exec
prises to increase storage utilization by consolidating
11d as described in the preceding section.
Each workload driver reported application-
their storage with a single efficient system.”
specific metrics, such as latency for Exchange
tasks and orders per minute. The test team
used Microsoft Windows Performance Monitor
to record disk parameters.
Figure 8 summarizes the total work and
data transfer of the five primary servers during
forth, for a total transfer of 54 GB. Overall, the
a single easy-to-use management interface
the eight-hour test. The 500 LoadGen heavy
PowerVault MD3000i supplied 387 GB of data
and optional integrated snapshot and virtual
users completed 23,832 tasks (such as reads,
during the eight-hour test.
disk copy functionality, the PowerVault
replies, and calendar updates) on the active
MD3000i enables enterprises to increase
Exchange node. The Exchange transaction log
Simple, cost-effective iSCSI storage
storage utilization by consolidating their stor-
files were shipped continuously to the passive
As the Dell tests demonstrate, a Dell PowerVault
age with a single efficient system.
Exchange node, helping synchronize it with
MD3000i array with two attached PowerVault
the active node. The passive node also han-
MD1000 enclosures was able to handle the I/O
Dave Jaffe, Ph.D., is a senior consultant on the
dled the two incremental Backup Exec 11d
from five server workloads—two nodes
Dell Enterprise Technology Center team who
backups. The Web-serving application handled
of a fully redundant Microsoft Exchange clus-
specializes in cross-platform solutions. He has
0.77 million orders, while the SQL Server data-
ter, a Web-serving application, a Microsoft
a B.S. in Chemistry from Yale University and a
base handled 1.1 million orders (equating to a
SQL Server database, and file-serving data
Ph.D. in Chemistry from the University of
total of more than 2 billion orders per year, if
transfers—as well as two incremental backups
California, San Diego.
they received orders at this pace 24 hours a
with Symantec Backup Exec 11d. By providing
day). The file share copied 705 files back and
simple, cost-effective iSCSI storage along with
Kendra Matthews is a storage product marketing manager on the Dell Global Commercial
Marketing team.
Total work
Total data transfer
Microsoft Exchange Server 2007
(active node)
23,832 tasks by 500 LoadGen heavy users
42 GB
Microsoft Exchange Server 2007
(passive node)
23,832 tasks by 500 LoadGen heavy users,
as well as two incremental backups
82 GB
0.77 million orders
61 GB
Microsoft SQL Server 2005
1.1 million orders
148 GB
File serving
705 file transfers
54 GB
Web serving
Total
387 GB
QUICK LINK
Dell PowerVault MD3000i:
DELL.COM/MD3000i
Figure 8. Total work and data transfer for the five primary workloads in the test environment
26
DELL POWER SOLUTIONS | November 2007
Reprinted from Dell Power Solutions, November 2007. Copyright © 2007 Dell Inc. All rights reserved.
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