Add part of a raw device to the pool.
将原始设备的一部分添加到池。
Consider a raw device for the log, but note that management is more difficult.
考虑为日志使用原始设备(raw device)，但是要注意，这样管理起来要更困难些。
If the raw device is not large enough for the new chunk end offset, the extension will fail.
如果原始设备对于新块结束偏移量不够大，扩展就会失败。
The only exception is Linux raw device tablespace containers, which inherently bypass the file cache.
惟一的例外是Linux原始设备表空间容器，因为它本身就绕过文件缓存。
An access to a raw device avoids the cache, resulting in direct read and write operations on the physical device.
而对原始设备的访问则没有缓存，导致物理设备上的直接读写操作。
An entry in this table stores a directory, a cooked file, or a raw device for use by the storage provisioning feature.
该表中的一个条目存储目录、熟文件或原始设备，供存储配置特性使用。
Be careful though; the OS usually writes its own metadata to the beginning of a raw device, and you don't want to copy that.
不过要注意，OS通常将自己的元数据写在原始设备的开头，这些内容是不需要复制的。
With database managed space (DMS) and raw device, we can decrease the time to fail over the disk resources, because there will be no checking of disks during failover.
通过数据库管理的空间(DMS)和原始设备，我们可以减少磁盘资源的故障转移时间，因为在故障转移时将不会进行磁盘检查。
The RAWDEVSIZE program was originally developed for SAP system environments, so the source code prototype is based on an SAP-specific convention regarding the raw device links.
RAWDEVSIZE程序最初是为SAP系统环境开发的，所以源代码原型基于特定于SAP的原始设备链接惯例。
Raw device usage also improves failover time in case the database is large, because during failover the operating system does not have to do a file check to the file system (FSCK).
如果数据库很大，那原始设备的使用也能减少故障转移时间，因为进行故障转移时，操作系统不必对文件系统进行文件检查(fsck)。
Raw device usage also improves failover time in case the database is large, because during failover the operating system does not have to do a file check to the file system (FSCK).
如果数据库很大，那原始设备的使用也能减少故障转移时间，因为进行故障转移时，操作系统不必对文件系统进行文件检查(fsck)。
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