元数据服务器容易形成单一失效点。
控制协议同步元数据服务器和数据服务器之间的状态。
The control protocol synchronizes state between the metadata server and the data servers.
为了避免缓存过期，元数据服务器将收回不准确的布局。
To prevent stale caches, the metadata server recalls layouts that have become inaccurate.
企业使用此功能可以将行业数据模型导出到元数据服务器中。
This feature enables the enterprise to export an industry data model to the metadata server.
元数据服务器管理数据位置，以及在何处存储新数据。
The metadata servers manage the location of data and also where to store new data.
元数据服务器(cmds)的工作就是管理文件系统的名称空间。
The job of the metadata server (CMDS) is to manage the file system's namespace.
物理数据模型的生成也保留术语表分类，准备好发布到元数据服务器。
Generation to physical data model also retains glossary classifications, ready for publication to metadata server.
物理数据模型的生成也保留术语表分类，准备好发布到元数据服务器。
Generation to physical data retains glossary classifications, ready for publication to metadata server.
元数据服务器管理inode空间，将文件名转变为元数据。
Metadata servers manage the inode space, converting file names to metadata.
如图4所示，元数据服务器管理名称空间部分，可以(为冗余和性能)进行重叠。
As shown in Figure 4, the metadata servers manage portions of the namespace and can overlap (for redundancy and also for performance).
如图1所示，客户使用元数据服务器，执行元数据操作(来确定数据位置)。
As Figure 1 shows, clients perform metadata operations (to identify the location of data) using the metadata servers.
然后基于XML和J2EE技术，提出了空间元数据服务器的总体设计框架。
Then based on XML and the J2EE technology, proposed the metadata server system design frame.
这个动作允许元数据服务器将最近的元数据回馈给客户（这在元数据操作中很常见）。
This behavior allows the metadata server to serve recent metadata back to clients (which is common in metadata operations).
元数据服务器集群中必须负载均衡，以防某个元数据服务器成为存储系统访问的瓶颈。
Load balancing must be implemented in metadata server cluster in order to avoid any metadata server becomes the bottleneck of the system.
如果客户机更改了这个文件，则会相应地更改布局的客户机实例，并且将所有更改提交回到元数据服务器。
If the client alters the file, the client's instance of the layout is duly modified, and all modifications are committed back to the metadata server.
当客户机不再需要这个文件时，它将提交剩余的更改，并将布局副本返回给元数据服务器，然后关闭文件。
When the client no longer needs the file, it commits any remaining changes, returns its copy of the layout to the metadata server, and closes the file.
元数据服务器不涉及任何形式的数据访问，用户与存储服务器之间可以进行高效的并行数据交换。
The metadata server does not relate to any data access, and there are paralleled and highly efficient data exchange between users and storage servers.
具有容错能力的双元数据服务器采用双系统备份、镜像复制存储技术，从而保证了元数据管理的高可靠。
DMDS adopts pair of system back-up and mirror-back-up memory technology. So the system has high reliability of metadata management.
元数据服务器将文件名转变为索引节点，文件大小，和Ceph客户端用于文件I/O的分段数据（布局）。
The metadata server transforms the file name into an inode, file size, and striping data (layout) that the Ceph client uses for file I/O.
一系列服务器通过一个客户界面访问Ceph生态系统，这就明白了元数据服务器和对象级存储器之间的关系。
A set of servers access the Ceph ecosystem through a client interface, which understands the relationship between metadata servers and object-level storage.
此外，SANFS还在客户端的文件系统一级，实现了对元数据服务器虚拟卷的支持，提高了系统可扩展性。
Further, on the level of clients file system, SANFS presents support of MDS's LVM which improves the scalability.
研究分析了传统的元数据服务系统的管理模式，并且对传统的双元数据服务器系统的可靠性进行了理论分析。
It analyzes the traditional metadata service system, and analyzes the reliability of the traditional dual MDS by theoretical analysis.
这个日志对故障恢复也很有用：如果元数据服务器发生故障，它的日志就会被重放，保证元数据安全存储在磁盘上。
The journal is also useful for failure recovery: if the metadata server fails, its journal can be replayed to ensure that metadata is safely stored on disk.
要注意的是，Ceph客户，对象存储端点，元数据服务器(根据文件系统的容量)可以有许多，而且至少有一对冗余的监视器。
Note that there can be many Ceph clients, many object storage endpoints, numerous metadata servers (depending on the capacity of the file system), and at least a redundant pair of monitors.
与其他对象存储文件系统一样，HUSTOBS文件系统由对象存储设备端、元数据服务器端和客户端三大部分组成。
HUSTOBS file system consists of Object-Based storage device, metadata server and client, just like most popular distributed file system.
在参考资料部分中，您将会找到如何设置一个简单Ceph集群(包括元数据服务器，对象存储服务器和监视器)的信息。
In the Resources section, you'll find information on how to set up a simple Ceph cluster (including metadata servers, object servers, and monitors).
事实上，元数据在一个元数据服务器集群上被进一步拆分，元数据服务器能够自适应地复制和分配名称空间，避免出现热点。
In fact, metadata is further split among a cluster of metadata servers that can adaptively replicate and distribute the namespace to avoid hot spots.
在metabrokerMetadataPrefilter窗口中，您可以筛选需要从元数据服务器中导入的类别。
In the metabroker metadata Prefilter window, you can filter which categories you want to import from the metadata server.
Metabroker status窗口将为您提供将整个术语表模型导出到元数据服务器中的选项，也可以筛选需要导出的内容。
The Metabroker status window provides you with the options to export the entire Glossary Model into the Metadata Server, or you can filter what you want to export.
PVFS向元数据服务器发送一个请求（图4中的步骤1、2），这会通知请求节点有关文件在各个I/O节点上的位置的信息。
PVFS sends a request to the meta-data server (steps 1 and 2 in Figure 4), which informs the requesting node about the location of the file among the various I/O nodes.
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