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FS-Cache 调研

最近需要使用到 FSCache,今天调研一下FS-Cache,主要记录一些索引,方便以后查阅:

RedHat 文档:https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/storage_administration_guide/ch-fscache (此文档讲解较为详细)

内核社区文档:https://www.kernel.org/doc/Documentation/filesystems/caching/fscache.txt 

FS-Cache: A Network Filesystem Caching Facility:https://people.redhat.com/dhowells/fscache/FS-Cache.pdf 

NFS 相关,请阅读:https://www.cnblogs.com/xuyaowen/p/NFS_install.html (之前写的关于nfs 的内容)

FS-Cache 配置文件解析:

###############################################################################
#
# Copyright (C) 2006,2010 Red Hat, Inc. All Rights Reserved.
# Written by David Howells (dhowells@redhat.com)
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version
# 2 of the License, or (at your option) any later version.
#
###############################################################################

dir /var/cache/fscache  # 自定义缓存目录
tag mycache             # 标签,用于区分多个缓存
brun 10%                # 剩余空间大于这个设置值时,自动进行缓存
bcull 7%                # 剩余空间大于这个设置值时,开始自动删除使用频率最低的缓存
bstop 3%                # 剩余空间小于这个设置值时,缓存功能关闭

# 开头的参数则是按照文件数来计算%, 其原理与根据block数(剩余空间)计算是一样的。
frun 10%
fcull 7%
fstop 3%

# Assuming you're using SELinux with the default security policy included in
# this package
secctx system_u:system_r:cachefiles_kernel_t:s0

关于nfs fsc 选项的说明(fsc选项):

阅读摘要:

  • yum install cachefilesd; 
  • 挂载命令:直接mount服务端共享的目录到本地的/mnt目录,必须使用-o fsc参数选项 

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