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gluster性能相关中继器默认值说明

时间:2016-08-14 22:30:25      阅读:448      评论:0      收藏:0      [点我收藏+]

标签:gluster   默认参数   性能中继器   

一、性能相关中继器

write-behind, read-ahead, io-cache, quick-read, open-behind, stat-prefetch(md-cache), io-threads(默认server端)

以上中继器默认全部开启,symlink-cache默认关闭


NFS相关性能优化中继器

默认开启:

performance.nfs.write-behind

默认关闭:

performance.nfs.read-ahead

performance.nfs.io-cache

performance.nfs.quick-read

performance.nfs.stat-prefetch

performance.nfs.io-threads

performance.force-readdirp

二、默认配置及默认值

1、默认配置中继

在./vols/tank/tank-fuse.vol(客户端)文件中,默认会配置如下中继器:

dht和性能相关的write-behind, read-ahead, io-cache, quick-read, open-behind, stat-prefetch(md-cache).

 

在./vols/tank/tank.node1.data-disk3.vol同类(服务器端)文件中,默认会设置如下中继器参数:

posix、access-control、locks、io-threads、index、maker

2、默认配置项值

cache-size

io-cahce:cache-size:默认32MB

Size of the read cache

quick-read:cache-size:默认128MB

Size of the read cache

gluster volume set tank cache-size 32MB

该命令导致的cache-size更新包含两个部分,一个是io-cache里对应的cache大小,一个是quick-read里的cache大小。

从源代码上看,这两个cache-size对应同一个key,所以会出现一改全改的现象,应该是一个bug。

read-ahead:page-count:默认值4

key为performance.read-ahead-page-count,可以通过该选项进行设置。

gluster volume set tank read-ahead-page-count 4

Number of pages that will be pre-fetched

write-behind:"cache-size"或者"window-size":默认值1MB

key为performance.write-behind-window-size,可以通过该选项进行设置。

gluster volume set tank write-behind-window-size 1MB

Size of the write-behind buffer for a single file (inode).

io-threads:thread-count:默认16

key:performance.io-thread-count

gluster volume set tank io-thread-count 16

Number of threads in IO threads translator which perform concurrent IO operations at a given time

该配置保存在/vols/tank/tank.node1.data-disk3.vol同类文件中。

md-cache:md-cache-timeout:默认值1(亦stat-prefetch)

gluster volume set tank md-cache-timeout 1

该操作会更改md-cache中继器md-cache-timeout选项的默认值

Time period after which cache has to be refreshed

io-cache:cache-timeout:默认值1

key:performance.cache-refresh-timeout

gluster volume set tank cache-refresh-timeout 1

cache-timeout:The cached data for a file will be retained till ‘cache-refresh-timeout‘ seconds, after which data re-validation is performed.


备注:默认参数基于GlusterFS 3.4.5

 

本文出自 “敏而好学” 博客,请务必保留此出处http://dangzhiqiang.blog.51cto.com/7961271/1837814

gluster性能相关中继器默认值说明

标签:gluster   默认参数   性能中继器   

原文地址:http://dangzhiqiang.blog.51cto.com/7961271/1837814

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