章 5. 檔案系統

支援 Btrfs 檔案系統

Red Hat Enterprise Linux 7.1 目前以技術預覽版的方式，支援 Btrfs（B-Tree）檔案系統。這檔案系統提供了更先進的管理功能、可靠度、以及可擴充性。Btrfs 能讓使用者建立 snapshot、啟用壓縮與裝置整合管理功能。

OverlayFS

The OverlayFS file system service allows the user to "overlay" one file system on top of another. Changes are recorded in the upper fil esystem, while the lower file system becomes read-only. This can be useful because it allows multiple users to share a file system image, for example containers, or when the base image is on read-only media, for example a DVD-ROM.
On Red Hat Enterprise Linux 7.1, OverlayFS is supported as a Technology Preview. There are currently two restrictions:
  • It is recommended to use ext4 as the lower file system; the use of xfs and gfs2 file systems is not supported.
  • SELinux is not supported, and to use OverlayFS, it is required to disable enforcing mode.

平行 NFS 支援

pNFS（平行 NFS，Parallel NFS）乃 NFS v4.1 標準的一部分，能讓用戶端以直接、平行的方式存取儲存裝置。pNFS 架構能針對數個常見的工作負載，改善 NFS 伺服器的延展性與效能。
pNFS defines three different storage protocols or layouts: files, objects, and blocks. The client supports the files layout, and with Red Hat Enterprise Linux 7.1, the blocks and object layouts are fully supported.
Red Hat 會持續與協力廠商與開放原始碼社群合作，在將來提供新的 pNFS 格式、以及對新格式的完整支援。
欲知 pNFS 的更多資訊，請參閱 http://www.pnfs.com/。