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4405ch03 Virtualization.fm Draft Document for Review September 2, 2008 5:05 pm
84 IBM Power 570 Technical Overview and Introduction
Virtual SCSI
Virtual SCSI is used to refer to a virtualized implementation of the SCSI protocol. Virtual SCSI
is based on a client/server relationship. The Virtual I/O Server logical partition owns the
physical resources and acts as server or, in SCSI terms, target device. The client logical
partitions access the virtual SCSI backing storage devices provided by the Virtual I/O Server
as clients.
The virtual I/O adapters (virtual SCSI server adapter and a virtual SCSI client adapter) are
configured using an HMC or through the Integrated Virtualization Manager on smaller
systems. The virtual SCSI server (target) adapter is responsible for executing any SCSI
commands it receives. It is owned by the Virtual I/O Server partition. The virtual SCSI client
adapter allows a client partition to access physical SCSI and SAN attached devices and
LUNs that are assigned to the client partition. The provisioning of virtual disk resources is
provided by the Virtual I/O Server.
Physical disks presented to the Virtual/O Server can be exported and assigned to a client
partition in a number of different ways:
The entire disk is presented to the client partition
The disk is divided into several logical volumes, these can be presented to a single client
or multiple different clients
As of Virtual I/O Server 1.5, files can be created on these disks and file backed storage
devices can be created
The Logical volumes or files can be assigned to different partitions. Therefore, virtual SCSI
enables sharing of adapters as well as disk devices.
Figure 3-4 shows an example where one physical disk is divided into two logical volumes by
the Virtual I/O Server. Each of the two client partitions is assigned one logical volume, which
is then accessed through a virtual I/O adapter (VSCSI Client Adapter). Inside the partition,
the disk is seen as a normal hdisk.
Figure 3-4 Architectural view of virtual SCSI
- Redpaper 1
- October 2008 3
- First Edition (October 2008) 4
- Contents 5
- Contents v 7
- Trademarks 10
- Become a published author 12
- Comments welcome 13
- General description 15
- 1.1 System specifications 17
- 1.2 Physical package 17
- 1.3 System features 18
- 1.3.2 Memory features 20
- 1.3.4 I/O drawers 22
- Front Rear 24
- 1.4 System racks 26
- Physical specifications 28
- Client responsibilities 28
- 1.4.5 Rack-mounting rules 31
- 1.4.6 Useful rack additions 32
- 1.4.7 OEM rack 33
- Architecture and technical 37
- 2.1 The POWER6 processor 38
- Figure 2-2 POWER6 processor 39
- 2.1.1 Decimal floating point 40
- 2.3 Processor cards 43
- 2.3.2 Processor clock rate 44
- 2.4 Memory subsystem 45
- 2.4.4 OEM memory 48
- 2.5 System buses 49
- 2.5.2 Service processor bus 50
- 2.6 Internal I/O subsystem 51
- 2.6.1 System ports 52
- POWER6 chip 56
- 2.8 PCI adapters 57
- 2.8.1 LAN adapters 58
- 2.8.2 SCSI and SAS adapters 58
- 2.8.3 iSCSI 59
- IBM iSCSI adapters 60
- 2.8.4 Fibre Channel adapter 61
- 2.8.5 Graphic accelerators 61
- 2.9 Internal storage 62
- 2.9.2 Split backplane 63
- 2.9.3 Internal media devices 63
- 2.10 External I/O subsystems 64
- 7311 Model D11 features 65
- PCI-X Bridge 66
- PCI-X slots 67
- SPCN cabling examples 68
- YO Cable 71
- IBM AIX 5L 77
- IBM AIX V6.1 77
- Linux for System p systems 78
- 2.13 Service information 79
- 2.14 System firmware 81
- System firmware download site 82
- 2.14.1 Service processor 84
- System Management Services 86
- Open Firmware 87
- Virtualization 89
- 3.1 POWER Hypervisor 90
- Virtual SCSI 91
- Virtual Ethernet 91
- Virtual (TTY) console 91
- 3.2 Logical partitioning 92
- 3.2.3 Processing mode 93
- Dedicated mode 94
- Shared dedicated mode 94
- Shared mode 94
- 3.3 PowerVM 95
- Shared Ethernet Adapter 96
- Chapter 3. Virtualization 83 97
- 3.3.3 PowerVM Lx86 99
- Supported Operating Systems 100
- Chapter 3. Virtualization 87 101
- Chapter 3. Virtualization 89 103
- 3.4 System Planning Tool 105
- Continuous availability and 107
- Component failure rates 108
- 4.2 Availability 109
- Persistent deallocation 110
- Memory protection 113
- Memory page deallocation 114
- Memory control hierarchy 114
- Memory deconfiguration 115
- L2 Array Protection 116
- 4.2.4 PCI Error Recovery 117
- 4.3 Serviceability 118
- 4.3.1 Detecting errors 119
- Error checkers 120
- Fault Isolation Registers 120
- 4.3.2 Diagnosing problems 121
- Boot-time 122
- Device drivers 122
- 4.3.3 Reporting problems 123
- Extended Error Data (EED) 124
- System dump handling 124
- Customer notify 124
- Call home 124
- Guiding light LEDs 125
- The operator panel 125
- Concurrent maintenance 126
- Blind-swap PCI adapters 126
- Firmware updates 126
- Repair and verify 127
- 4.5 Manageability 130
- Graphics terminal 134
- Example 4-1 135
- 4.6 Cluster solution 136
- Related publications 139
- Online resources 140
- How to get Redbooks 140
- Help from IBM 140
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