记录每个VIOS上当前的虚拟设备映射。
设备映射器模块必须在系统启动时装载。
设备映射器的作用就是将这些名称正确地映射到物理设备。
It is the device mapper's job to map these names correctly to the physical devices.
创建虚拟目标设备，用于将SCSI设备映射到逻辑卷(请参见清单6)。
Create the virtual target device that maps the virtual SCSI device to the logical volume (see Listing 6).
LVM依赖于另一个名为设备映射器的存储组件，其提供(在其他功能中)多路径功能。
The LVM relies on another storage component called the Device-mapper, which provides (among other features) the ability to multipath.
把物理适配器或LNAGG设备映射到IVM上的虚拟以太网id之后，需要为每个逻辑分区创建虚拟适配器。
Once a physical adapter or LNAGG device has been mapped to a virtual Ethernet ID on the IVM, then the virtual adapter needs to be created for each logical partition.
首先，我们必须从ds8300VIOS (hvio1和hvio2)删除DS8300磁盘的设备映射。
First, we must remove the device mappings for the DS8300 disk from the DS8300 VIOS (hvio1 and 2).
添加lun的原因是，使用的根文件系统和DMMP无法将它添加到设备映射；因此，无法对根分区应用该名称。
The reason for the additional LUN is that the root file system is in use at this time and DMMP cannot add it to the device map; therefore, you cannot get that name for the root partition.
设备映射器(也称为dm_mod)是一个Linux内核模块(也可以是内置的)，最早出现在2.6.9内核中。
Device mapper (also known as dm_mod) is a Linux kernel module (it can be built-in too), upstream since kernel 2.6.9.
基于IEC 61850标准设计的新型数字保护平台将过程层合并单元、智能执行单元和间隔层设备映射到具体的板卡上。
A digital protection platform is designed according to IEC 61850, in which the merging unit, smart actuator and bay-level devices are mapped to actual circuit boards.
如果将设备映射程序多路径(DMMP)工具用于多路径存储，则可以将友好的名称用于根文件系统以避免设备在重新启动后被dmmp重新编号。
If you use the device mapper multi-path (DMMP) tool for your multi-path storage, then you can use a friendly name for your root file system to avoid the device being renumbered by DMMP after reboot.
在Linux 上启用多路径有两种方法 ——使用IBM/LSI 提供的官方RDAC 驱动程序和设备映射器的开放源码多路径工具。
There are two ways to enable multipathing under Linux -- using the official RDAC driver from IBM/LSI and the open source multipath tools of the device-mapper.
这样就可以通过SharedEthernetAdapter（ent16-ent18）把这个链路聚合设备映射到一个虚拟设备（ent13 - ent15）。
This allows you to map the link aggregation device to a virtual device (ent13 - ent15) via a Shared Ethernet Adapter (ent16 - ent18).
在某些情况下，还可以把一般文件或另一个设备的文件描述符映射到内存。
In some cases, you can also map a file descriptor to a plain file or another device into memory.
除了实际的文件，设备与共享内存对象都能够被映射。
In addition to actual files, devices and Shared memory objects can be mapped.
鲍默劳以及全球无数个研究小组正在致力于研究映射大脑血液流动的脑部扫描设备。
Pomerleau and countless research groups around the world are working with brain scanning devices to map blood flow in the brain.
数据捕获提供本地设备通信和到通用API的映射。
Data capture provides that native device communication and mapping to the common API.
当这种映射发生时，硬件将负责访问(和保护)，客户操作系统在使用该设备时，就仿佛它不是一个虚拟系统一样。
When this mapping occurs, the hardware takes care of access (and protection), and the guest operating system can use the device as if it were a non-virtualized system.
这样一来，放置组(以及副本)到存储设备的映射就不用依赖任何元数据，而是依赖一个伪随机的映射函数。
In this way, mapping of placement groups (and replicas) to storage devices does not rely on any metadata but instead on a pseudo-random mapping function.
布局描述了文件到存储设备的映射。
The layout describes the mapping of the file to the storage devices.
创建链路聚合设备之后，需要把它映射到虚拟适配器。
Once the link aggregation device has been created, it needs to be mapped to a virtual adapter.
然后，VIO服务器把这些虚拟适配器映射到物理以太网适配器，这些VIO客户机LPAR可以通过相同的设备进行通信。
The VIO servers then map these virtual adapters to physical Ethernet adapters, and those VIO client LPARs can communicate through the same device.
磁盘和网络设备通常映射到机器的物理磁盘和网络设备（如图2 所示）。
The disk and network device commonly map into the machine's physical disk and network device (as shown in Figure 2).
所有的网络设备都有一个ARP映射表，就是内存里的一小段存储着目前该设备已经匹配的IP地址和MAC地址对。
All network devices have an ARP table, a short-term memory of all the IP addresses and MAC addresses the device has already matched together.
主机操作系统不再需要考虑块到文件的映射，存储设备本身会提供这种映射，因此主机可以在文件级进行操作。
Rather than the host operating system needing to worry about block-to-file mapping, the storage device itself provides this mapping, allowing the host to operate at the file level.
ARP映射表确保该设备不会向它已经通讯过的设备重复发送ARP请求。
The ARP table ensures that the device doesn't have to repeat ARP Requests for devices it has already communicated with.
这样就可以使用可伸缩的设计了，在这种设计中，新的用户代理映射可以作为新设备添加到门户，但portlet不需要改变自己的行为。
This allows for a scalable design in that new User-Agent mappings can be added to the portal as new devices become available, but portlets need not change their behavior.
在一个驱动程序中，mmap函数通过remap _ pfn_range内核函数实现，它提供设备内存到用户地址空间的线性映射。
Within a driver, the mmap function is implemented through the remap_pfn_range kernel function, which provides a linear mapping of device memory into a user's address space.
setup_arch还需要对闪存存储库、系统寄存器和其它特定设备执行内存映射。
The setup_arch also needs to perform any memory mappings for flash Banks, system registers, and other specific devices.
接下来，我们运行rmvdev命令来删除与这个hdisk(比如vtscsi2)相关联的所有虚拟目标设备(VTD)映射。
Next, we run the rmvdev command to remove any virtual target device (VTD) mapping associated with the hdisk (e.g. vtscsi2).
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