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Resource Management
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Memory Resource Management
VMware ESX Server provides dynamic control over the amount of physical memory
allocated to each virtual machine. You may overcommit memory, if you wish, so the
total size configured for all running virtual machines exceeds the total amount of
available physical memory. The system manages the allocation of memory to virtual
machines automatically based on allocation parameters and system load.
You may specify initial memory allocation values for a virtual machine in its
configuration file. You may also modify most memory allocation parameters
dynamically using the VMware Management Interface, the procfs interface on the
console operating system or the Perl API. Reasonable defaults are used automatically
when parameters are not specified explicitly.
You have access to information about current memory allocations and other status
information through the management interface, the procfs interface on the console
operating system and the Perl API.
Allocation Parameters
Three basic parameters control the allocation of memory to each virtual machine:
• Its minimum size — min
• Its maximum size — max
• Its shares allocation
The system automatically allocates an amount of memory to each virtual machine
somewhere between its minimum and maximum sizes based on its shares and an
estimate of its recent working set size.
The maximum size is the amount of memory configured for use by the guest
operating system running in the virtual machine. This maximum size must be
specified in the configuration file for the virtual machine. By default, virtual machines
operate at their maximum allocation, unless memory is overcommitted.
The minimum size is a guaranteed lower bound on the amount of memory that is
allocated to the virtual machine, even when memory is overcommitted. The system
uses an admission control policy to enforce this guarantee. A new virtual machine is
not permitted to power on if there is insufficient memory to reserve its minimum size.
Memory shares entitle a virtual machine to a fraction of physical memory. For
example, a virtual machine that has twice as many shares as another is generally
entitled to consume twice as much memory, subject to their respective minimum
- VMware ESX Server 1
- VMware, Inc 2
- 3145 Porter Drive 2
- Palo Alto, CA 94304 2
- Table of Contents 3
- Welcome to VMware ESX Server 13
- What’s New in Version 1.5 15
- System Requirements 17
- Legacy Devices 21
- Technical Support Resources 22
- Installing, Configuring and 25
- Upgrading ESX Server 25
- ESX Server 26
- Before You Begin 28
- Installing VMware ESX Server 28
- Your Server 33
- 7. Click Perform Action 54
- GSX Server Virtual Machines 71
- Preparing to Use the Remote 79
- Management Software 79
- Linux – RPM Installer 81
- Linux – Tar Installer 81
- Remote Console on page 114 82
- Workstation 84
- Using the VMware Management 94
- Interface 94
- Management Interface 99
- Running VMware ESX Server 105
- Management Interface window 105
- Using Disk Modes 108
- Monitoring System Status 109
- Using the Remote Console 114
- VMware Tools Settings 117
- Cutting, Copying and Pasting 119
- Using SNMP with ESX Server 125
- Configuring SNMP Security 132
- Name Data type Description 139
- Backing Up Virtual Machines 140
- Operating Systems 144
- Guest Operating System 147
- Guest Operating Systems 149
- To enable expert mode, 154
- To enable expert mode, … 156
- Service 167
- Console Operating System and 169
- VMkernel 169
- Operating System 171
- The VMkernel Loader 173
- VMkernel Device Modules 174
- Machines 179
- Configuring Virtual Machines 181
- Using VMkernel Devices 182
- Modifying the SMBIOS UUID 187
- Enabling Repeatable Resumes 191
- Authenticating Users 193
- Default Permissions 194
- Using vmkfstools 199
- Naming VMFS File Systems 205
- Determining SCSI Target IDs 208
- Sharing the SCSI Bus 210
- Using Storage Area Networks 212
- Networking 215
- Promiscuous Mode 222
- Sharing Network Adapters and 224
- Virtual Networks 224
- Performance Tuning for Heavy 228
- Network Loads 228
- Resource Management 231
- CPU Resource Management 234
- Multiprocessor Systems 235
- Memory Resource Management 239
- Admission Control 240
- Dynamic Allocation 240
- Memory Reclamation 241
- Memory Sharing 242
- Sizing Memory on the Server 249
- Virtual Machine Memory 250
- Memory Overcommitment 251
- More Information 252
- Network Bandwidth Management 253
- Disk Bandwidth Management 257
- Configuration File Options 258
- Glossary 261
- Appendix A: I/O Adapter 265
- Compatibility Guide 265
- Linux Driver Compatibility 267
- VMware Certification 267
- Adaptec SCSI Adapters 268
- Emulex Fibre Channel Adapters 272
- QLogic Fibre Channel Adapters 272
- Compaq RAID Controllers 272
- Mylex DAC960 RAID Controllers 273
- Intel Gigabit Ethernet NICs 277
- The OpenSSL Toolkit License 280
- License Issues 280
- Original SSLeay License 281
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