Dell PowerVault RD1000 Handbuch

Dell | Storage Product Group

Dell PowerVaultTM

RD1000 USB 3.0

Performance

Considerations

Table of Contents

Introduction: The PowerVault RD1000 with USB 3.0 ................................................................................... 3

Performance Considerations ........................................................................................................................ 4

USB 3.0 Performance Improvements over USB 2.0...................................................................................... 4

Conclusion..................................................................................................................................................... 6

Appendix 1 – Test Setup ............................................................................................................................... 7

Appendix 2 – Test Results ............................................................................................................................. 7

Appendix 3 - DellTM PowerVaultTM System Storage and USB 3.0 HBAs Matrix. ........................................... 7

Introduction: The PowerVault RD1000 with USB 3.0

The Dell PowerVault RD1000 is a removable disk storage device which offers the data access speed of

storing data on a hard disk, the portability of optical media, and the physical protection of tape media.

The removable disk drive lets you quickly protect all your important information and take it with you.

Designed as a sensible, affordable alternative to tape and CD/DVD backup, the RD1000 is fast, user-

friendly, and reliable.

The latest update to the PowerVault RD1000, changes the game by replacing the USB 2.0 interface on

the external PowerVault RD1000 and PowerVault RD1000 114X versions with the next generation in

USB 3.0 storage interconnects and provides a significant boost in performance over USB 2.0.

At the heart of the RD1000 is the removable disk media that combines a tough exterior design and an

internal shock absorber — all rigorously tested to the highest standards. Simply pop in the removable

disk media, select the files or folders you want to protect, then drag-and-drop them into the directory

folder. To restore files, just reverse the process. Drag-and-drop capability gives you random access for

much quicker restoration of the files you need most. The RD1000 comes with everything you need to

protect data quickly and easily: drive unit, removable disk cartridge, and Symantec Backup Exec

QuickStart software.

The RD1000 is offered in the following form factor, as shown in table 1, for use in data centers utilizing

rack mounted servers and storage.

PowerVault RD1000 Standalone

External Drive (USB 3.0 connection)

Rack-mounted PowerVault RD1000

PV 114X (Drive (USB 3.0 connection)

Available in configuration up to four

RD10000 drives

Internal PowerVault RD1000 SATA

for tower and rack servers (3.5-inch

and 5.25-inch form factors)

Table 1: RD1000 Form Factors

Performance Considerations

Optimizing the PowerVault RD1000 backup solution to provide the best data transfer speeds and

performance is a key focus for many system administrators. Now with the availability of the PowerVault

RD1000 USB 3.0 the key variable to consider for achieving the best throughput with the RD1000 solution

is implementing an end-to-end USB 3.0 solution.

The PowerVault RD1000 USB 3.0 comes complete with the RD1000 dock and the USB 3.0 interface cable,

both of which have been designed to meet the USB 3.0 specification. In order to get a complete USB 3.0

solution, the host system must also be capable of supporting USB 3.0. Most servers have USB 2.0

connections, so in order to realize the performance increase; the host server will need to install a USB

3.0 host bus adapter. By attaching the RD1000 USB 3.0 to a host server which only has USB 2.0 or older,

will limit the performance of the RD1000 significantly but will still provide a increase in performance as

compared to USB 2.0 to USB 2.0 connection .

USB 3.0 Performance Improvements over USB 2.0

The PowerVault RD1000 USB 3.0 has been put through Dell’s rigorous performance testing suite which

measures the read and write performance across multiple different RD1000 configurations. These

performance measurements were compiled and are presented in figures 1 and 2 below to show the

benefits of the RD1000 USB 3.0 over the USB 2.0 version.

Multiple data sets were used; however, the primary data set consisted of 10 GB or randomly generated

data. There were 6,169 files ranging in size from 6 KB to 4 MB which were distributed in nested folder

structure of 157 folders. All testing was performed using the data protection software which is included

with the PowerVault RD1000, Symantec BackupExec 2010 QuickStart.

Backup and restores were performed to and from multiple RD1000 USB 2.0 and USB 3.0 docks with

varying combinations of USB 2.0 and USB 3.0 cables and hosts. Averages were then taken across the

various performance tests with each RD1000. Figure 1 shows the results of the write performance on

the RD1000. Three configurations were tested:

1) RD1000 USB 3.0 end-to –end solution,

2) RD1000 USB 3.0 with a USB 2.0 host,

3) RD1000 USB 2.0 end-to-end solution.

Figure 1 - Write Performance Testing - RD1000 USB 2.0 and USB 3.0

The benefits of USB 3.0 on RD1000 are immediately clear. Out of the box RD1000 USB 3.0 provides an

approximate 20% increase with even just a USB 2.0 host. The write performance jumps from an average

of 21.8 MB/s with USB 2.0 to 26.2 MB/s with USB 3.0 connected to a USB 2.0 host. With an end-to-end

USB 3.0 solution the performance reached speeds of 74 MB/s.

On reads, the performance with USB 3.0 over USB 2.0 was also very apparent. RD1000 USB 3.0 also

provides an approximate 20% increase on the read performance over USB 2.0. The read performance

with USB 2.0 was 25.5 MB/s and 30.2 MB/s with USB 3.0 connected to a USB 2.0 host. The RD1000 3.0

end-to-end solution averaged approximately 72 MB/s.

0.0

10.0

20.0

30.0

40.0

50.0

60.0

70.0

80.0

500 GB

Performance (MB/s)

RD1000 Cartridge Size (GB)

Write Performance

RD1000 USB 2.0 vs. RD1000 USB 3.0

USB 3.0 Dock / USB 3.0 Cable / USB 3.0 Host

USB 3.0 Dock / USB 3.0 Cable / USB 2.0 Host

USB 2.0 Dock / USB 2.0 Cable / USB 2.0 Host

Figure 2 - Read Performance Testing - RD1000 USB 2.0 and USB 3.0

Conclusion

The introduction of the PowerVault RD1000 USB 3.0 provides a significant performance improvement

over USB 2.0 which helps decrease backup windows and provides system administrators access to their

data faster during those critical times. The optimal performance is seen with an end-to-end USB 3.0

solution when a USB 3.0 host is used. However, even with the RD1000 USB 3.0 provided out of the box,

it provides an improvement over the USB 2.0 end-to-end solution when only connected to a USB 2.0

host.

0.0

10.0

20.0

30.0

40.0

50.0

60.0

70.0

80.0

500 GB

Performance(MB/s)

RD1000 Cartridge Size (GB)

Read Performance

RD1000 USB 2.0 vs. RD1000 USB 3.0

USB 3.0 Dock / USB 3.0 Cable / USB 3.0 Host

USB 3.0 Dock / USB 3.0 Cable / USB 2.0 Host

USB 2.0 Dock / USB 2.0 Cable / USB 2.0 Host

Appendix 1 – Test Setup

Component Configuration

Server Dell PowerEdge R710

Processor Intel 3GHz P

Memory 4GB

Operating System Windows 2008 SP1

Hard drives

8 * 10K 146GB SAS

Hard Drive configuration One SAS hard drives contained the Microsoft Windows

2008 SP1 operating system, while the remaining seven

SAS hard drives were configured in RAID 0 and stored

the data set used for the performance testing.

Appendix 2 – Test Results

The table below summarizes the theoretical and measured performance referenced in this white paper

for the PowerVault RD1000.

Configuration Transfer Rate

(Theoretical)

Maximum Burst

Transfer Rate

Typical Transfer

Rate

RD1000 USB 2.0 + USB 2.0

Cable + USB 2.0 Host

480 Mbps (60MB/s) 35 MBps 25 MBps

RD1000 USB 3.0 + USB 3.0

Cable + USB 2.0 Host

480 Mbps (60MB/s) 35 MBps 30 MBps

RD1000 USB 3.0 +USB 3.0

Cable + USB 3.0 Host

5000 Mbps (640

MB/s)

230 MBps 80 MBps

Appendix 3 - DellTM PowerVaultTM System Storage and USB 3.0 HBAs

Matrix.

Host Bus Adapter Dell

PowerVault

System

Dell Tape Backup Unit

Belkin 2-port PCI Express USB 3.0 External PowerVault RD1000 Ext USB 2.0

PowerVault RD1000 Ext USB 3.0

PV114x PowerVault RD1000 Rack USB 2.0

PowerVault RD1000 Rack USB 3.0

StarTech 2-Port PCI Express USB 3.0 External PowerVault RD1000 Ext USB 2.0

PowerVault RD1000 Ext USB 3.0

PV114x PowerVault RD1000 Rack USB 2.0

PowerVault RD1000 Rack USB 3.0

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