[zz]FS-Cache merged in Kernel 2.6.30

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于 2012-05-28 15:35:00 发布

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FS-Cache已合并到即将发布的内核2.6.30中，为文件系统提供通用缓存接口。这使得通过本地硬盘缓存NFS、AFS或CD-Rom等高延迟访问的数据成为可能，从而大幅提升访问速度。对于存储大型磁盘映像文件的场景尤其有用，只要具备本地磁盘即可实现高效缓存。

FS-Cache has been merged into the upcoming kernel 2.6.30. This allows for a generic caching interface in the kernel for other file systems. For example, you can use local hard disks to cache data accessed via NFS, AFS, or CD-Rom. Since these tend to be high-latency while the disks are low latency, it should provide for a nice speedup.

Of particular interest to me, I contacted maintainer David Howells who is a Redhat employee. I asked whether this infrastructure would help with large disk image files stored on NFS — a common though not particularly efficient case for VMWare, Xen, KVM, etc. His exact response was “Quite feasible. As long as you have a local disk on which to cache the files.”

I am quite happy as I run this setup at work for some production VMs since it allows for easy migration and backup without the complexity and cost of a SAN or cluster FS. I look forward to testing when 2.6.30 hits the stable tree.