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Chapter 10 - Performance Tuning and Troubleshooting
174
VMA-series Memory Array Installation and Service Guide
HP-AM456-9002A Rev 01
Performance Testing Using perf_test
The perf_test utility is a lightweight tool for measuring the I/O performance
of storage devices.
The
perf_test utility was specifically designed to push the I/O device as hard
as possible using a variety of methods including POSIX threads, variable block
sizing, asynchronous I/O, direct communication, as well as sequential and
random read/ write operations to data over a user-defined address range.
This section describes the
perf_test utility and shows how it may be used to
test the performance of a direct-attached Memory Array system:
• Running the perf_test Utility on page 174
• Baselining the Memory Array System on page 176
• Testing Read Bandwidth on page 177
• Testing Write Bandwidth on page 177
Running the perf_test Utility
For best results, use the (
-R) option to randomly access a specific range (-s)
using multiple threads (
-t), direct I/Os (-o), and asynchronous I/Os (-A).
For example, the command
perf_test -s 640 -R -A64 -t8 -o returns the
following example when run on a Linux host:
# perf_test -s 640 -R -A64 -t8 -o
Violin Memory, Inc.
Version: vtms-linux-utils-D4.5.4, 05/23/2011
Command: perf_test -s 640 -R -A64 -t8 -o
Running with options:
threads = 8
block_size = 4096
memory size = 640 GB
memory start addr = 0x0
write:read ratio = 0:1
random mode = 1
duration = 0 secs
path = /dev/vtms-strad
MB = 1000000 bytes
no-cache mode = 1
AIO depth = 64
Time(sec)Read BW Write BWTotal BWRead IOPSWrite IOPSTotal IOPS
1 817.181 MB/s0.000 MB/s817.181 MB/s1995070199507
- HP VMA-series Memory Array 1
- LEGAL NOTICES 2
- COMPLIANCE INFORMATION 3
- Notice Description 3
- Table of Contents 12
- List of Figures 13
- List of Tables 15
- Document Organization 17
- Document Conventions 18
- Safety Icons 18
- Typographical Conventions 19
- Security 19
- Reference Documents 19
- Contacting HP 19
- Product Overview 21
- VMA-series Overview 23
- Features 24
- Physical Components 24
- System LEDs 25
- Power Supplies 27
- Figure 1.6 Fan Module 28
- Management Interfaces 29
- Storage Interfaces 29
- System Specifications 31
- 53 for more information 32
- Supported Operating Systems: 32
- VIMM Types 34
- VIMM Configurations 35
- VIMM Slot Locations 35
- 42–Module Configuration 36
- Operation 37
- Installing the Array 39
- Rack-Mounting the Chassis 42
- Equipment Rack 42
- Connecting Power 47
- Power Requirements 47
- Connecting Equipment Ground 48
- Connecting Management Network 50
- Connecting the Serial Cable 50
- Connecting the Ethernet Cable 51
- Ethernet 52
- Host Computer 53
- Memory Gateway 54
- Powering up the Memory Array 56
- Configuring the Array 57
- Memory Array Default Settings 58
- Connecting to the CLI 59
- Changing the Admin Password 62
- Changing the Hostname 64
- Configuring DHCP Settings 65
- Displaying DHCP Status 65
- Enabling DHCP 65
- Disabling DHCP 66
- Configuring the DNS Name 67
- Ethernet 0 68
- Setting the DNS Mode 69
- Syslog Host 71
- Formatting the Memory Array 74
- Connecting via SSH 76
- Connecting via Telnet 76
- Setting the Number of Columns 79
- Setting the Pagination Mode 82
- HH:MM:SS 84
- Retrieving the MAC Address 88
- RAID Group 90
- Displaying Fan Status 94
- Displaying Alarms and Logs 96
- Displaying the Current Alarms 96
- Displaying the System Log 96
- Displaying the Messages Log 97
- Rebooting the Memory Array 98
- Rebooting the System 98
- Canceling a Scheduled Reboot 98
- Upgrading the System Software 100
- Using SCP 101
- Length 102
- Displaying the Upgrade Path 105
- HP-AM456-9002A Rev 01 106
- Servicing the Array 107
- Safety Precautions 108
- ESD Precautions 108
- Testing the LEDs 109
- Testing the System LEDs 109
- Testing the VIMM LEDs 110
- Replacing the Fans 111
- PORT 1 PORT 2 112
- Replacing VIMMs 113
- Host Utilities 115
- Linux Drivers 117
- Linux Drivers Overview 118
- Kernel Development Package 119
- GCC Compiler 120
- Libaio Development Package 120
- Installing Linux Drivers 120
- Removing the Linux Drivers 125
- Unloading the Linux Driver 127
- /dev/vtmsa<n> 131
- Partitions 133
- Windows Drivers 135
- Windows Driver Overview 136
- Installing Prerequisites 136
- Installing Windows Drivers 137
- Click the Next button 138
- Chapter 8 - Windows Drivers 140
- (driver-storport-Dx.x.x.zip) 141
- Removing the Windows Drivers 143
- Removing the Violin Utilities 148
- Violin Utilities 149
- Running the Violin Utilities 150
- Violin Utilities Reference 150
- Option Description 164
- Product Models 179
- Appendix A - Product Models 180
- Compliance Information 181
- Lithium Battery Caution 183
- Cabinet Safety Precautions 183
- European Union RFI Statement 184
- Korea RFI Statement 185
- Canada RFI Statement 185
- Australia C-Tick Label 185
- Alarm Reference 187
- Interpreting Alarm LEDs 188
- Message Commands 189
- Service-Affecting Alarms 190
- Port Service-Affecting Alarms 192
- RAID Service-Affecting Alarms 193
- Appendix C - Alarm Reference 194
- VIMM Service-Affecting Alarms 196
- Non-Service Affecting Alarms 196
- 1 or 2. The Alarm LED is not 200
- 1) or bottom (2) 207
- CLI Reference 209
- Appendix D - CLI Reference 210
- Context Navigation 211
- Typing CLI Commands 211
- General Commands 213
- <context_level> 214
- Chassis Context Commands 221
- Board 0 Context Commands 223
- Slot Context Commands 227
- VIMM Context Commands 230
- VIMM-summary Context Commands 233
- Output Description 235
- Controller Context Commands 236
- Ethernet 0 Context Commands 238
- Fan-tray Context Commands 243
- Fan Context Commands 244
- CLI Context Commands 245
- Cancels the oam_cli session 250
- RAID Context Commands 251
- RAID Group Context Commands 253
- Maps Context Commands 255
- System Context Commands 257
- Alarms Context Commands 273
- Boot-params Context Level 275
- LED-state Context Commands 277
- Logging Context Commands 279
- In-memory Context Commands 281
- Category Context Commands 285
- Syslog Context Commands 287
- Status Context Commands 290
- Sw-upgrade Context Commands 294
- Uptime Context Commands 297
- Version Context Commands 298
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