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SuperCache II详解

内容:
cache page size: (缓存页大小)默认:32K,大的值会增加碎片,小的值增加开销。
详解:这个就相当于格式化磁盘时设置分配单元大小那样。如果设为较小的值,那同样的缓存尺寸就有较多的缓存页,每页的平均浪费率也就较小,然而小的页值也产生大的内存开销,更消耗CPU资源。大值就反之。
推荐:64K P4处理器:64K 至强处理器:32K
Cache size:(缓存大小)默认:128M,指定分配给cache的物理内存大小,必须是4MB的整数倍。
详解:在没启用cache时,记下正常使用服务器中可用内存的最小值,所有盘的cache size总数不要超过可用内存最小值的90%。不过也要注意当cache size很大,而cache page size太小时,你的CPU是否顶得住。
推荐:如果内存=2G的话,读写分离,读盘:500M,写盘:500M~800M
        如果内存3~4G的话,读写分离,读盘:700M~800M,写盘:1024M~1500M
Sort algorithm:(排序算法)默认:MRU,指定cache排序算法,MRU即最近使用。MFU即最常使用。
详解:MRU算法,缓存中只保留最近使用过的数据,当缓存满后丢弃过时的数据。这个算法简单,耗CPU资源少。
        MFU算法,缓存中只保留最常用的数据,当缓存满后丢弃最少用到的数据。这个算法比较耗CPU资源,当cahce size值大,cache page size值小时,就要考滤你的CPU是否顶得住了。
推荐:MRU用于写盘
       MFU用于读盘
电影服务器推荐用MRU。
Read-ahead:(预先读取)默认:0,指定预先读取的页数。
详解,即当系统要读某扇区的数据时,cache预先读取后续扇区的数据,这里是指定预读数据量的单位是cache page数量。当读取连续扇区时预读取能极大提高读性能,但连续性不高时,反而白白耗了磁盘资源。
推荐:1,无盘服务器的写盘和客户系统盘和游戏盘的效果不是很大,设太大了可能得不偿失。电影服务器可以设大点。
Deferred-write mode:(延迟写入模式)默认:关闭,指定缓存页的平均写延时。写入延时以秒为单位,这只是个平均值,有些缓存页可能很快就写到磁盘了,而有些缓存页可 能比指定的时间还要迟。(注:缓存页是指只写到缓存还没写到硬盘的那些cache page。)Supend lazywriting:(挂起写延时,相当于缓存页的平均写延时是无穷大的。)这时数据只会写入到缓存而不会写到磁盘里,当这些页达到了丢弃的时候(由 排序算法定),会被重新激活。当整个cache(大小由cache size定)都被缓存页占满时,会被强制写到磁盘里。
推荐:写盘可以启用。读盘还是关闭的好。

附加:VFCFG.EXE命令详解:
用法:
  vfcfg [ [-h hostname]               [-n username -p password] ]               [volume] [-status -sc -stop]                          [-lw latency]               [-ps pagesize]               [-cs cachesize] [-ra readahead]               [-mfu onoff]
说明:
-h 主机名或目标计算机,缺省为本地机。
-n 用户名(账号)缺省为当前用户
-p 密码
-n 用户名的密码缺省为NULL
Volume 盘符,
-status 显示状态。
-sc 启用cache
-stop 停用
-lw 设lazywrite latenc,'Off', 'disable' '0'为关闭写延时,也可直接跟数字,最大为14400秒。
-ps Cache page size (in KB).
-cs Cache size (in MB).
-ra Read-ahead value
-mfu on 就是用MFU,off就是用MRU。缺省是off。
SuperCacheII(超级红缓存)使用说明
支持win2003的稳定版SuperCacheII!

SuperCache_II for win2003Server这个软件最主要的功能就是帮硬盘做cache的动作,你可以把他想成是硬盘的快取,目前市面上的硬盘快取主要为8MB,用这个 软件你内存有多大就可以用多少喔,默认值是128MB。(相当于买了大缓存的硬盘,想想看,256M缓存硬盘的速度!)

Supercache简单设定方法:
1.先安装好重开机
2.在我的计算机里面,把你要cache的磁盘按右键选内容:
3.再选Performance:
4.点SuperCache II...会出现目前状况:
5.点Configure...来设定:

设置说明:
Cache page size一般来说不太需要动他,选大一点会有比较好的效能,但是空间使用上会比较浪费(最好和阵列的一致)
Cache size要使用多少内存来当cache,最大值请勿超过物理内存开机以后所剩下的量,不然会反效果。(系统最少保留256M以上)
Sort algorithm换页算法,MRU比较省CPU资源,MFU则可能会有比较高的击中率。
Read-ahead通常5个应该就够了(我设的是2)
Defferred-write就是所谓的write-back,可以提高写入效能,不过如果当机,会导致数据流失,通常建议不要使用(小心测试,不要太猛)
首先简单介绍一下硬件情况,安装SuperCache II建议内存最低配置需要2G。1G系统自己用,另外1G分给SuperCache II。
这里我们用的SuperCache II程序版本为
SuperCache II and SuperVolume Server Edition v1.0.12.0
操作系统为 Windows server 2003

安装过程就略
安装后直接进入盘符属性里设置即可。盘符属性里多了一个选项。

点击缓存设置进入设置项。
缓存页面大小设置为阵列簇大小。
缓存大家为512M。因为前面我们提到分给SuperCache II缓存1G,我们这里做的锐起无盘XP是读写分离,所以读、写分别分512M缓存。
排算方法我们这里选MRU,这里千万不要选择MFU。因为很多朋友安装后反应卡机都跟这个有关系。因为MFU占有CPU使用率太大了。
顺序读我们这里选1。
这样我们就设置好了写盘。至于读盘,我们用同样的方法设置即可。
最后注意的是内存太小,千万不要过分分配。这样会起到反效果。我原来是1G的,因为用这个缓存工具,又另外添置了1G。说实话刚开始装由于配置不 好,卡的跟蜗牛一样。所以建议大家把服务器内存添置到2G来。这样才可以达到最基本想要的结果。至于安装后效果,大家可以明显感觉出来。不像其它同类软 件。主要体现为多机同时进入系统速度和一些游戏卡机现象

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