文章目录
安装多路径软件(系统默认安装)
#第一:安装多路径软件
yum -y install device-mapper device-mapper-multipath
#第二:在CentOS7中启用多路径模块,mpathconf命令及相关模块加载(可以使用mpathconf -h查看用法)
使用 mpathconf 命令创建配置文件并启用多路径。若无需编辑该配置文件,可使用此命令启动多路径守护程序
mpathconf --enable
mpathconf --with_module y
mpathconf --with_multipathd y
#第三:在CentOS7中,启动multipathd服务及设置开机自启
systemctl start multipathd.service
systemctl enable multipathd.service
注意:系统决定多路径设备的属性时,会先检查多路径设置,然后检查设备设置,最后才检查多路径系统默认设置
挂载iscsi设备,并记录iscsi设备的全球识别符wwid号
#第一:发现
iscsiadm --mode discovery --type sendtargets --portal 192.168.1.40
iscsiadm --mode discovery --type sendtargets --portal 192.168.1.50
#第二:登录
iscsiadm -d2 -m node -T iqn.1994-05.com.redhat:scst1 -p 192.168.1.40 --login
iscsiadm -d2 -m node -T iqn.1994-05.com.redhat:scst1 -p 192.168.1.50 --login
#第三:查看磁盘(发现有两块相同大小容量的磁盘)
fdisk -l
#第四:查看并记录iscsi设备的wwid号
multipath -l
编辑多路径软件DM-Multipath的配置文件,并重启多路径软件
#第一:修改DM配置文件
vim /etc/multipath.conf
defaults {
user_friendly_names yes
find_multipaths yes
}
multipaths {
multipath {
wwid 23237636464633731 #这是刚才记录的wwid号
alias vda #配置显示别名
path_grouping_policy multibus
path_selector "round-robin 0" #轮巡策略
failback manual
rr_weight priorities
no_path_retry 5
}
}
blacklist {
devnode "sda"
}
#第二:reload多路径软件
systemctl reload multipathd.service
#第三:查看磁盘设备(发现出现了一块/dev/mapper/vda的磁盘)
fdisk -l
磁盘 /dev/mapper/vda:4293 MB, 4293693440 字节,8386120 个扇区
Units = 扇区 of 1 * 512 = 512 bytes
扇区大小(逻辑/物理):512 字节 / 512 字节
I/O 大小(最小/最佳):4096 字节 / 524288 字节
磁盘标签类型:dos
磁盘标识符:0x00032eb1
#第四:分区,格式化,挂载使用
#第五:测试多路径
down eth0 测试是否磁盘可写
down eth1,同时启用eth0 测试是否磁盘可写
DM-Multipath的配置文件概述
defaults #DM Multipath 的常规默认设置。
blacklist #不被视为多路径的具体设备列表。
blacklist_exceptions #根据 blacklist 部分中的参数列出不在黑名单中的多路径设备
multipaths #各个独立多路径设备的特性设置。这些数值覆盖了在配置文件的 defaults 和 devices 部分中指定的数值
devices #各个存储控制器的设置。这些数值覆盖了在配置文件的 defaults 部分指定的数值。如果要使用不是默认支持的存储阵列,则可能需要为您的阵列创建 devices 子部分
vim /etc/multipath.conf
# This is a basic configuration file with some examples, for device mapper
# multipath.
#
# For a complete list of the default configuration values, run either
# multipath -t
# or
# multipathd show config
#
# For a list of configuration options with descriptions, see the multipath.conf
# man page
## By default, devices with vendor = "IBM" and product = "S/390.*" are
## blacklisted. To enable mulitpathing on these devies, uncomment the
## following lines.
#blacklist_exceptions {
# device {
# vendor "IBM"
# product "S/390.*"
# }
#}
## Use user friendly names, instead of using WWIDs as names.
defaults {
user_friendly_names yes
find_multipaths yes
}
##
## Here is an example of how to configure some standard options.
##
#
#defaults {
# polling_interval 10
# path_selector "round-robin 0"
# path_grouping_policy multibus
# uid_attribute ID_SERIAL
# prio alua
# path_checker readsector0
# rr_min_io 100
# max_fds 8192
# rr_weight priorities
# failback immediate
# no_path_retry fail
# user_friendly_names yes
#}
##
## The wwid line in the following blacklist section is shown as an example
## of how to blacklist devices by wwid. The 2 devnode lines are the
## compiled in default blacklist. If you want to blacklist entire types
## of devices, such as all scsi devices, you should use a devnode line.
## However, if you want to blacklist specific devices, you should use
## a wwid line. Since there is no guarantee that a specific device will
## not change names on reboot (from /dev/sda to /dev/sdb for example)
## devnode lines are not recommended for blacklisting specific devices.
##
#blacklist {
# wwid 26353900f02796769
# devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"
# devnode "^hd[a-z]"
#}
#multipaths {
# multipath {
# wwid 3600508b4000156d700012000000b0000
# alias yellow
# path_grouping_policy multibus
# path_selector "round-robin 0"
# failback manual
# rr_weight priorities
# no_path_retry 5
# }
# multipath {
# wwid 1DEC_____321816758474
# alias red
# }
#}
#devices {
# device {
# vendor "COMPAQ "
# product "HSV110 (C)COMPAQ"
# path_grouping_policy multibus
# path_checker readsector0
# path_selector "round-robin 0"
# hardware_handler "0"
# failback 15
# rr_weight priorities
# no_path_retry queue
# }
# device {
# vendor "COMPAQ "
# product "MSA1000 "
# path_grouping_policy multibus
# }
#}
multipaths {
multipath {
wwid 23237636464633731
alias vda
path_grouping_policy multibus
path_selector "round-robin 0"
failback manual
rr_weight priorities
no_path_retry 5
}
}
blacklist {
devnode "sda"
}
这是centos7 多路径设备支持官方文档
https://qiniu.wsfnk.com/Red_Hat_Enterprise_Linux-7-DM_Multipath-zh-CN.pdf
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