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  • 带阵列卡的机器打开磁盘cache

    1、在HBA卡环境下:

    1-1、如果是后SAS盘

    [root@localhost ~]# sdparm /dev/sdf 
    /dev/sdf: SEAGATE ST4000NM0023 0004
    Read write error recovery mode page:
    AWRE 1 [cha: y, def: 1, sav: 1]
    ARRE 1 [cha: y, def: 1, sav: 1]
    PER 0 [cha: y, def: 0, sav: 0]
    Caching (SBC) mode page:
    WCE 1 [cha: y, def: 1, sav: 1]
    RCD 0 [cha: y, def: 0, sav: 0]
    Control mode page:
    SWP 0 [cha: n, def: 0, sav: 0]
    Informational exceptions control mode page:
    EWASC 1 [cha: y, def: 1, sav: 1]
    DEXCPT 0 [cha: y, def: 0, sav: 0]
    MRIE 0 [cha: y, def: 0, sav: 0]

    Check HDD Write cache status #

    sdparm /dev/sda 

    WC is disabled, it should show ‘Caching mode page = 0.

    WC is enabled, it should show ‘Caching mode page = 1.
    Disable write cache #

    sdparm –s WCE=0 --save /dev/sda
     

    Enable write cache #

    sdparm –s WCE=1 --save /dev/sda

    1-2、如果是SATA盘 则使用 sg3

    安装:yum install sg3*

    检查硬盘的cache是否打开:hdparm -W  /dev/sdd

    如果cache打开则显示:write caching = 1 (on)

    如果cache没有打开:write caching = not supported

    打开cache :sg_raw –s 512 –i WCE.bin /dev/sda A1 0A 25 D6 01 E0 4F C2 A0 B0 00 00

    关闭cache:sg_raw –s 512 –i WCD.bin /dev/sda A1 0A 25 D6 01 E0 4F C2 A0 B0 00 00

    磁盘的默认设置:sg_raw –s 512 –i WC_Set_feature.bin /dev/sda A1 0A 25 D6 01 E0 4F C2 A0 B0 00 00

    WC_Set_feature.bin

    WCD.BIN

    WCE.BIN

    2、在Raid卡环境下,使用Megacli直接关闭或打开:

    MegaCli -LDSetProp -EnDskCache|-DisDskCache -L0 -a0 

    注:如果是第3块 逻辑硬盘,则 命令为:MegaCli -LDSetProp -EnDskCache|-DisDskCache -L3 -a0 
    ———————————————————————————————
    原文链接:https://blog.csdn.net/u013000139/article/details/50371468

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  • 原文地址:https://www.cnblogs.com/larrypeng/p/11880693.html
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