工具1： storcli
a. 确认软件包是否安装
[root@localhost ~]#rpm -qa | grep storcli
storcli-1.21.06-1.noarch
备注：若检索结果为空，需要安装对应的软件安装包。安装命令如下：
#rpm -ivh storcli-xx-xx-1.noarch.rpm
b. 查看逻辑卷读/写缓存状态
备注：请关注标红部分示例为：NRWTD, 参数解释如下：
NR: No Read Ahead（关闭预读，即读缓存关闭）
R:Read Ahead(开启预读，即开启读缓存）
WB: Write Back（开启回写，即开启写缓存）
AWB: Always Write Back（强制开启回写，强制开启写缓存）
WT: Write Through(直写模式，关闭回写/写缓存）
[root@localhost ~]# /opt/MegaRAID/storcli/storcli64 /c0/v1 show
Controller = 0
Status = Success
Description = None
Virtual Drives :
==============
--------------------------------------------------------------
DG/VD TYPE State Access Consist Cache Cac sCC Size Name
--------------------------------------------------------------
1/1 RAID10 Optl RW No NRWTD - ON 2.180 TB
--------------------------------------------------------------
Cac=CacheCade|Rec=Recovery|OfLn=OffLine|Pdgd=Partially Degraded|Dgrd=Degraded
Optl=Optimal|RO=ReadOnly|RW=ReadWrite|HD=Hidden|TRANS=TransportReady|B=Blocked| Consist=Consistent|R=ReadAheadAlways|NR=NoReadAhead|WB=WriteBack| AWB=AlwaysWriteBack|WT=WriteThrough|C=CachedIO|D=DirectIO|sCC=ScheduledCheck Consistency
c. 读缓存打开/关闭
语法如下：
storcli /cx/vx set rdcache=RA|NoRA
参数说明：
cx: x为数字，从0开始，代表控制器编号
vx: x为数字，从0开始，代表逻辑卷编号
RA: Read Ahead
NoRA: No Read Ahead
示例：
[root@localhost ~]# /opt/MegaRAID/storcli/storcli64 /c0/v1 set rdcache=ra
Controller = 0
Status = Success
Description = None
Detailed Status :
===============
---------------------------------------
VD Property Value Status ErrMsg ErrCd
---------------------------------------
1 rdCache RA Success - 0
---------------------------------------
[root@localhost ~]# /opt/MegaRAID/storcli/storcli64 /c0/v1 set rdcache=nora
Controller = 0
Status = Success
Description = None
Detailed Status :
===============
---------------------------------------
VD Property Value Status ErrMsg ErrCd
---------------------------------------
1 rdCache NoRA Success - 0
---------------------------------------
d. 写缓存打开/关闭
语法如下：
storcli /cx/vx set wrcache=WT|WB|AWB
参数说明：
cx: x为数字，从0开始，代表控制器编号
vx: x为数字，从0开始，代表逻辑卷编号
WT: Write Through
WB: Write Back
AWB: Always Write Back
示例：
[root@localhost ~]# /opt/MegaRAID/storcli/storcli64 /c0/v1 set wrcache=wt
Controller = 0
Status = Success
Description = None
Detailed Status :
===============
---------------------------------------
VD Property Value Status ErrMsg ErrCd
---------------------------------------
1 wrCache WT Success - 0
---------------------------------------
[root@localhost ~]# /opt/MegaRAID/storcli/storcli64 /c0/v1 set wrcache=wb
Controller = 0
Status = Success
Description = None
Detailed Status :
===============
---------------------------------------
VD Property Value Status ErrMsg ErrCd
---------------------------------------
1 wrCache WB Success - 0
---------------------------------------
[root@localhost ~]# /opt/MegaRAID/storcli/storcli64 /c0/v1 set wrcache=awb
Controller = 0
Status = Success
Description = None
Detailed Status :
===============
---------------------------------------
VD Property Value Status ErrMsg ErrCd
---------------------------------------
1 wrCache AWB Success - 0
---------------------------------------
工具2：megacli
a. 确认软件包是否安装
[root@localhost ~]# rpm -qa | grep -i MegaCli
MegaCli-8.07.10-1.noarch
备注：若检索结果为空，需要安装对应的软件安装包。安装命令如下：
#rpm -ivh MegaCli-xx-xx-1.noarch.rpm
b. 查看逻辑卷读/写缓存状态
请关注标红部分示例为： WriteBack, ReadAheadNone, Direct, Write Cache OK if Bad BBU, 参数解释如下：
NORA: No Read Ahead（关闭预读，即读缓存关闭）
RA:Read Ahead(开启预读，即开启读缓存）
WB: Write Back（开启回写，即开启写缓存）
ForcedWB: Forced Write Back（强制开启回写，强制开启写缓存）
WT: Write Through(直写模式，关闭回写/写缓存）
示例：
[root@localhost ~]# /opt/MegaRAID/MegaCli/MegaCli64 -ldinfo -l1 -a0
Adapter 0 -- Virtual Drive Information:
Virtual Drive: 1 (Target Id: 1)
Name :
RAID Level : Primary-1, Secondary-0, RAID Level Qualifier-0
Size : 2.180 TB
Sector Size : 512
Is VD emulated : Yes
Mirror Data : 2.180 TB
State : Optimal
Strip Size : 64 KB
Number Of Drives per span:2
Span Depth : 5
Default Cache Policy: WriteBack, ReadAheadNone, Direct, Write Cache OK if Bad BBU
Current Cache Policy: WriteBack, ReadAheadNone, Direct, Write Cache OK if Bad BBU
Default Access Policy: Read/Write
Current Access Policy: Read/Write
Disk Cache Policy : Disk's Default
Ongoing Progresses:
Check Consistency : Completed 26%, Taken 493 min.
Encryption Type : None
Bad Blocks Exist: No
PI type: No PI
Is VD Cached: No
Exit Code: 0x00
c. 读/写缓存打开/关闭
语法如下：
MegaCli -LDSetProp {-Name LdNamestring} | -RW|RO|Blocked|RemoveBlocked | WT|WB|ForcedWB [-Immediate] |RA|NORA|ADRA |
DsblPI
| Cached|Direct | -EnDskCache|DisDskCache | CachedBadBBU|NoCachedBadBBU
-Lx|-L0,1,2|-Lall -aN|-a0,1,2|-aALL
参数说明：
aN: N为数字，从0开始，代表控制器编号
Lx: x为数字，从0开始，代表逻辑卷编号
NORA: No Read Ahead（关闭预读，即读缓存关闭）
RA:Read Ahead(开启预读，即开启读缓存）
WB: Write Back（开启回写，即开启写缓存）
ForcedWB: Forced Write Back（强制开启回写，强制开启写缓存）
WT: Write Through(直写模式，关闭回写/写缓存）
读缓存修改示例：
[root@localhost ~]# /opt/MegaRAID/MegaCli/MegaCli64 -LdSetProp RA -L1 -a0
Set Read Policy to ReadAhead on Adapter 0, VD 1 (target id: 1) success
Exit Code: 0x00
[root@localhost ~]# /opt/MegaRAID/MegaCli/MegaCli64 -LdSetProp NORA -L1 -a0
Set Read Policy to NoReadAhead on Adapter 0, VD 1 (target id: 1) success
Exit Code: 0x00
读缓存修改示例：
[root@localhost ~]# /opt/MegaRAID/MegaCli/MegaCli64 -LdSetProp WB -L1 -a0
Set Write Policy to WriteBack on Adapter 0, VD 1 (target id: 1) success
Exit Code: 0x00
[root@localhost ~]#/opt/MegaRAID/MegaCli/MegaCli64 -LdSetProp WT -L1 -a0
Set Write Policy to WriteThrough on Adapter 0, VD 1 (target id: 1) success
Exit Code: 0x00
[root@localhost ~]#/opt/MegaRAID/MegaCli/MegaCli64 -LdSetProp ForcedWB -L1 -a0
Set Write Policy to Forced WriteBack on Adapter 0, VD 1 (target id: 1) success
Exit Code: 0x00
工具3：hpssacli/ssacli
说明：
1. hpssacli工具为旧工具，目前大部分线上服务器都安装有对应的安装包，ssacli为新工具，在旧工具无法正常执行的情况下，建议使用新工具，语法完全一致。
2. ssdsmartpath（固态硬盘智能路径）和caching(写缓存）只能打开一个，在一个打开的状态下，另外一个的值必定是关闭的,例如：
caching：Enable的情况下，ssdsmartpath的值必定为disabled.
a. 确认安装包是否安装
[root@localhost ~]# rpm -qa | grep hpssacli
hpssacli-2.20-11.0.x86_64
备注：若检索结果为空，需要安装对应的软件安装包。安装命令如下：
#rpm -ivh hpssacli-xx-xx.x86_64.rpm
#rpm -ivh ssacli-xx-xx.x86_64.rpm
b. 确认硬盘控制器所在slot插槽
说明：如下所示， 阵列卡型号为Smart Array P840ar, 插槽位置为Slot 0, 务必查询信息，插槽位置后面的命令要用。
[root@localhost ~]# hpssacli ctrl all show
Smart Array P840ar in Slot 0 (Embedded) (sn: PVYKH0BRH710CO)
c. 确认逻辑卷写缓存(caching)状态
参数说明：
ctrl: Controller 简写
slot=0: 硬盘控制器所在PCIe插槽位置
ld 2: ld(logical drive 逻辑卷）,后面的数字为逻辑卷编号，顺序从1开始
show: 信息展示
说明：请关注示例中caching的值，示例中为Disabled(即关闭）
[root@localhost ~]# hpssacli ctrl slot=0 ld 2 show
Smart Array P840ar in Slot 0 (Embedded)
array B
Logical Drive: 2
Size: 2.2 TB
Fault Tolerance: 1+0
Heads: 255
Sectors Per Track: 32
Cylinders: 65535
Strip Size: 256 KB
Full Stripe Size: 1280 KB
Status: OK
MultiDomain Status: OK
Caching: Disabled
Unique Identifier: 600508B1001C0D8EB99EB2A7EE5060E4
Disk Name: /dev/sdb
Mount Points: /opt/uredis 2.2 TB Partition Number 1
Logical Drive Label: 06172624PVYKH0BRH710COB70A
Mirror Group 1:
physicaldrive 1I:1:5 (port 1I:box 1:bay 5, Solid State SATA, 480.1 GB, OK)
physicaldrive 1I:1:6 (port 1I:box 1:bay 6, Solid State SATA, 480.1 GB, OK)
physicaldrive 1I:1:7 (port 1I:box 1:bay 7, Solid State SATA, 480.1 GB, OK)
physicaldrive 1I:1:8 (port 1I:box 1:bay 8, Solid State SATA, 480.1 GB, OK)
physicaldrive 1I:1:4 (port 1I:box 1:bay 4, Solid State SATA, 480.1 GB, OK)
Mirror Group 2:
physicaldrive 1I:1:3 (port 1I:box 1:bay 3, Solid State SATA, 480.1 GB, OK)
physicaldrive 2I:2:1 (port 2I:box 2:bay 1, Solid State SATA, 480.1 GB, OK)
physicaldrive 2I:2:2 (port 2I:box 2:bay 2, Solid State SATA, 480.1 GB, OK)
physicaldrive 2I:2:3 (port 2I:box 2:bay 3, Solid State SATA, 480.1 GB, OK)
physicaldrive 2I:2:4 (port 2I:box 2:bay 4, Solid State SATA, 480.1 GB, OK)
Drive Type: Data
LD Acceleration Method: HP SSD Smart Path
d. 确认逻辑卷ssdsmartpath状态
参数说明：
ctrl: Controller 简写
slot=0: 硬盘控制器所在PCIe插槽位置
array b: ld(array, 磁盘阵列，也即逻辑卷）,后面的字母为逻辑卷编号，顺序从a开始
show: 信息展示
说明：请关注示例中ssdsmartpath的值，示例中为Enable(即关闭）
[root@localhost ~]# hpssacli ctrl slot=0 array b show
Smart Array P840ar in Slot 0 (Embedded)
Array: B
Interface Type: Solid State SATA
Unused Space: 0 MB (0.0%)
Used Space: 4.4 TB (100.0%)
Status: OK
MultiDomain Status: OK
Array Type: Data
HP SSD Smart Path: enable
e. 关闭固态硬件智能路径并打开写缓存示例
[root@localhost ~]# hpssacli ctrl slot=0 array b modify ssdsmartpath=disable
[root@localhost ~]# hpssacli ctrl slot=0 ld 2 modify caching=enable
f. 关闭写缓存并打开固态硬盘智能路径
[root@localhost ~]# hpssacli ctrl slot=0 ld 2 modify caching=disable
[root@localhost ~]# hpssacli ctrl slot=0 array b modify ssdsmartpath=enable
工具4： arcconf
a. 确认软件包是否安装
[root@localhost ~]# rpm -qa | grep Arcconf
Arcconf-2.04-22665.x86_64
备注：若检索结果为空，需要安装对应的软件安装包。安装命令如下：
#rpm -ivh Arcconf-xx-xx.x86_64.rpm
b. 确认硬盘控制器信息
说明：控制器编号从1开始，所以示例中控制器ID为1:
[root@localhost ~]# /usr/Arcconf/arcconf list
Controllers found: 1
----------------------------------------------------------------------
Controller information
----------------------------------------------------------------------
Controller ID : Status, Slot, Mode, Name, SerialNumber, WWN
----------------------------------------------------------------------
Controller 1: : Optimal, Slot 2147483647, RAID (Expose RAW), , FB488000, 560DA833FB488000
c. 查看逻辑卷读/写缓存状态
备注：
1. 请关注标红部分示例为：参数说明如下：
Read-cache setting : Enabled(读缓存打开)
Write-cache setting : Enabled(写缓存打开）
2. 示例命令行参数说明（/usr/Arcconf/arcconf getconfig 1 ld 1）
getconfig: prints controller information(打印控制器相关信息）
第一个1：控制器编号
ld:logical drive(逻辑卷，即磁盘阵列）
第二个1：逻辑卷编号，从0开始，示例是第二个逻辑卷，所以为1.
[root@localhost ~]# /usr/Arcconf/arcconf getconfig 1 ld 1
Controllers found: 1
----------------------------------------------------------------------
Logical device information
----------------------------------------------------------------------
Logical Device number 1
Logical Device name : data
Block Size of member drives : 512 Bytes
RAID level : 10
Unique Identifier : 6CDE0BB1
Status of Logical Device : Optimal
Additional details : Quick initialized
Size : 1014 MB
Parity space : 1024 MB
Stripe-unit size : 256 KB
Interface Type : Serial ATA
Device Type : HDD
Read-cache setting : Enabled
Read-cache status : On
Write-cache setting : Enabled
Write-cache status : On
Partitioned : No
Protected by Hot-Spare : No
Bootable : No
Failed stripes : No
Power settings : Disabled
--------------------------------------------------------
Logical Device segment information
--------------------------------------------------------
Group 0, Segment 0 : Present (3815447MB, SATA, HDD, Enclosure:0, Slot:2) K4KZMMKL
Group 0, Segment 1 : Present (3815447MB, SATA, HDD, Enclosure:0, Slot:3) K7G2L3SL
Group 1, Segment 0 : Present (3815447MB, SATA, HDD, Enclosure:0, Slot:4) K4KYTSLL
Group 1, Segment 1 : Present (3815447MB, SATA, HDD, Enclosure:0, Slot:5) K7G183TL
d. 读/写缓存设置语法
语法如下：
Usage: SETCACHE <Controller#> LOGICALDRIVE <LogicalDrive#> <logical mode> [noprompt] [nologs]
Usage: SETCACHE <Controller#> DEVICE <Channel# ID#> <physical mode> [nologs]
Usage: SETCACHE <Controller#> DEVICEALL <policy> [noprompt] [nologs]
Example: SETCACHE 1 LOGICALDRIVE 0 ron
Example: SETCACHE 1 DEVICE 0 0 wt
Example: SETCACHE 1 DEVICEALL drivespecific
===================================================================================
Changes a device's cache mode.
LOGICALDRIVE parameters
LogicalDrive# : Number of the logical device whose cache will be altered
Logical Modes : ron - read cache enabled
roff - read cache disabled
wt - write through
wb - write back
wbb - write back with battery/ZMM
con - cache enabled
coff - cache disabled
DEVICE parameters
Channel# ID# : Channel and ID of the device whose cache will be altered
Physical Modes : wt - write through
wb - write back
DEVICEALL parameters
Policy : disable - write back for all physical drives
enable - write through for all physical drives
drivespecific - user can set for an individual physical drive
部分参数说明：
rron: read cache enabled(打开读缓存)
roff: read cache disabled(关闭读缓存)
wt: write through(只写模式，即关闭写缓存）
wb:write back(回写模式，即打开写缓存）
con: cache enabled(打开逻辑卷缓存（打开读/写缓存前提是逻辑卷缓存已打开，在逻辑卷关闭的情况下，无法打开读/写缓存））
coff: cache disabled(关闭逻辑卷缓存）
noprompt：no prompt(没有提示，按照默认y执行，部分命令需要和用户交互，使用noprompt参数可按照默认yes答复执行）
e. 读缓存打开/关闭示例
[root@localhost ~]# /usr/Arcconf/arcconf setcache 1 logicaldrive 1 roff
Controllers found: 1
Command completed successfully.
[root@localhost ~]# /usr/Arcconf/arcconf setcache 1 logicaldrive 1 ron
Controllers found: 1
Command completed successfully.
f. 写缓存打开/关闭示例
[root@localhost ~]# /usr/Arcconf/arcconf setcache 1 logicaldrive 1 wt
Controllers found: 1
Command completed successfully.
You have new mail in /var/spool/mail/root
[root@localhost ~]# /usr/Arcconf/arcconf setcache 1 logicaldrive 1 wb
Controllers found: 1
WARNING: Power failure without battery/ZMM support will lead to data loss.
Do you wish to continue?
Press y, then ENTER to continue or press ENTER to abort: y
Command completed successfully.
[root@localhost ~]# /usr/Arcconf/arcconf setcache 1 logicaldrive 1 wbb
Controllers found: 1
Command completed successfully
