CentOS 6.2 Linux 多路径安装文档.docx

CentOS 6.2 Linux 多路径安装文档注：当使用DM-Mulitpath之后,设备生成的新文件会存在三个不同的目录中1）/dev/mapper/目录下的文件，是早在系统启动的过程中就创建了。访问multipath设备时就使用这些文件，例如创建lvm；2）/dev/mpath/目录下的文件，是为了可以方便的在同一个目录下查看所有的multipath设备。这个文件由udev创建。如果系统在启动过程中需要访问multipath设备，不要使用这些文件。不用在这些设备文件上建立lvm；3）/dev/dm-n只为了内部使用目的，永远不要对这些文件进行操作挂载光盘到/media,进入安装包所在目录/media/Packagesrootpython Packages# mount /dev/cdrom /mediarootpython Packages# cd /media/Packages多路径软件包包含下面2个：rootpython Packages# ls device-mapper-multipath-device-mapper-multipath-0.4.9-46.el6.x86_64.rpmdevice-mapper-multipath-libs-0.4.9-46.el6.x86_64.rpm下面命令说明多路径没有安装（查看dm_multipath)rootpython Packages# lsmod |grep multipath安装device-mapper-multipath-0.4.9-46.el6.x86_64.rpm需要先安装红色字体标识的包rootpython Packages# rpm -ivh device-mapper-multipath-0.4.9-46.el6.x86_64.rpm warning: device-mapper-multipath-0.4.9-46.el6.x86_64.rpm: Header V3 RSA/SHA1 Signature, key ID c105b9de: NOKEYerror: Failed dependencies:device-mapper-multipath-libs = 0.4.9-46.el6 is needed by device-mapper-multipath-0.4.9-46.el6.x86_64kpartx = 0.4.9-46.el6 is needed by device-mapper-multipath-0.4.9-46.el6.x86_64libmultipath.so()(64bit) is needed by device-mapper-multipath-0.4.9-46.el6.x86_64rootpython Packages# rpm -ivh device-mapper-multipath-libs-0.4.9-46.el6.x86_64.rpm warning: device-mapper-multipath-libs-0.4.9-46.el6.x86_64.rpm: Header V3 RSA/SHA1 Signature, key ID c105b9de: NOKEYerror: Failed dependencies:libaio.so.1()(64bit) is needed by device-mapper-multipath-libs-0.4.9-46.el6.x86_64libaio.so.1(LIBAIO_0.1)(64bit) is needed by device-mapper-multipath-libs-0.4.9-46.el6.x86_64libaio.so.1(LIBAIO_0.4)(64bit) is needed by device-mapper-multipath-libs-0.4.9-46.el6.x86_64先安装libaio包，下面4个都装rootpython Packages# rpm -ivh libaio-libaio-0.3.107-10.el6.i686.rpmlibaio-0.3.107-10.el6.x86_64.rpmlibaio-devel-0.3.107-10.el6.i686.rpmlibaio-devel-0.3.107-10.el6.x86_64.rpmrootpython Packages# rpm -ivh libaio-0.3.107-10.el6.x86_64.rpm warning: libaio-0.3.107-10.el6.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID c105b9de: NOKEYPreparing. # 100%1:libaio # 100%rootpython Packages# rpm -ivh libaio-devel-0.3.107-10.el6.x86_64.rpm warning: libaio-devel-0.3.107-10.el6.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID c105b9de: NOKEYPreparing. # 100%1:libaio-devel # 100%rootpython Packages# rpm -ivh libaio-0.3.107-10.el6.i686.rpm warning: libaio-0.3.107-10.el6.i686.rpm: Header V3 RSA/SHA256 Signature, key ID c105b9de: NOKEYPreparing. # 100%1:libaio # 100%rootpython Packages# rpm -ivh libaio-devel-0.3.107-10.el6.i686.rpm warning: libaio-devel-0.3.107-10.el6.i686.rpm: Header V3 RSA/SHA256 Signature, key ID c105b9de: NOKEYPreparing. # 100%1:libaio-devel # 100%rootpython Packages# rpm -ivh kpartx-0.4.9-46.el6.x86_64.rpm warning: kpartx-0.4.9-46.el6.x86_64.rpm: Header V3 RSA/SHA1 Signature, key ID c105b9de: NOKEYPreparing. # 100%1:kpartx # 100%再安装device-mapper-multipath-libs-0.4.9-46.el6.x86_64.rpm 多路径LIB包rootpython Packages# rpm -ivh device-mapper-multipath-libs-0.4.9-46.el6.x86_64.rpm warning: device-mapper-multipath-libs-0.4.9-46.el6.x86_64.rpm: Header V3 RSA/SHA1 Signature, key ID c105b9de: NOKEYPreparing. # 100%1:device-mapper-multipath# 100%rootpython Packages# rpm -ivh device-mapper-multipath-0.4.9-46.el6.x86_64.rpm warning: device-mapper-multipath-0.4.9-46.el6.x86_64.rpm: Header V3 RSA/SHA1 Signature, key ID c105b9de: NOKEYPreparing. # 100%1:device-mapper-multipath# 100%检查安装结果rootpython Packages# rpm -qa|grep multipathdevice-mapper-multipath-libs-0.4.9-46.el6.x86_64device-mapper-multipath-0.4.9-46.el6.x86_64添加内核模块rootpython Packages# modprobe dm-multipathrootpython Packages# modprobe dm-round-robin检查内核模块添加结果rootpython Packages# lsmod |grep multipathdm_multipath 17585 1 dm_round_robindm_mod 81500 9 dm_multipath,dm_mirror,dm_log查看起机时是否有multipathd服务rootpython Packages# chkconfig -list|grep multipath若没有则下面命令添加此服务rootpython Packages# chkconfig -add multipathd再检查是否有multipathd服务rootpython Packages# chkconfig -list|grep multipathmultipathd 0:off 1:off 2:off 3:off 4:off 5:off 6:off设定开机自动启动此服务rootpython Packages# chkconfig multipathd on检查多路径启动选项已经为ONrootpython Packages# chkconfig -list|grep multipathmultipathd 0:off 1:off 2:on 3:on 4:on 5:on 6:off启动多路径软件服务rootpython Packages# service multipathd startStarting multipathd daemon: OK rootpython Packages# multipath -v2Jan 13 09:11:22 | /etc/multipath.conf does not exist, blacklisting all devices.Jan 13 09:11:22 | A sample multipath.conf file is located atJan 13 09:11:22 | /usr/share/doc/device-mapper-multipath-0.4.9/multipath.confJan 13 09:11:22 | You can run /sbin/mpathconf to create or modify /etc/multipath.conf使用命令创建/etc/multipath.confmpathconf命令使用方法rootpython Packages# /sbin/mpathconf -helpusage: /sbin/mpathconf Commands:Enable: -enable Disable: -disableSet user_friendly_names (Default n): -user_friendly_names Set find_multipaths (Default n): -find_multipaths Load the dm-multipath modules on enable (Default y): -with_module start/stop/reload multipathd (Default n): -with_multipathd chkconfig on/off multipathd (Default y): -with_chkconfig 创建/etc/multipath.confrootpython Packages# mpathconf -enable -find_multipaths y -with_multipathd y -with_chkconfig y创建后查看/etc/multipath.conf整个配置分两部分1 设备名单部分blacklist 中定义不被多路径的设备,可以用WWid号2 默认规则部分关健参数path_grouping_policy定义策略rootpython Packages# cat /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, see# /usr/share/doc/device-mapper-multipath-0.4.9/multipath.conf.defaults# For a list of configuration options with descriptions, see# /usr/share/doc/device-mapper-multipath-0.4.9/multipath.conf.annotated# 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 find_multipaths yesuser_friendly_names yes# Here is an example of how to configure some standard options.#defaults # udev_dir /dev# polling_interval 10# selector round-robin 0# path_grouping_policy multibus# getuid_callout /lib/udev/scsi_id -whitelisted -device=/dev/%n# 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 hda-z#multipaths # multipath # wwid 3600508b4000156d700012000000b0000# alias yellow# path_grouping_policy multibus# path_checker readsector0# 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# getuid_callout /lib/udev/scsi_id -whitelisted -device=/dev/%n# 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# #blacklist 重启多路径服务rootpython Packages# service multipathd restartStopping multipathd daemon: OK Starting multipathd daemon: OK 显示多路径拓扑 (全部信息)rootpython Packages# multipath -ll 仅显示已创建devmap名称rootpython Packages# multipath -v2Jan 13 09:23:42 | /lib/udev/scsi_id exitted with 1Jan 13 09:23:42 | /lib/udev/scsi_id exitted with 1使更新之后的配置生效rootpython Packages# multipath -Fmultipath命令使用方法rootpython Packages# multipath -helpUnknown switch: (null)multipath-tools v0.4.9 (04/04, 2009)Usage:multipath -c -d -r -v lvl -p pol -b fil -q devmultipath -l|-ll|-f -v lvl -b fil devmultipath -F -v lvlmultipath -hWhere:-h print this usage text-l show multipath topology (sysfs and DM info)-ll show multipath topology (maximum info)-f flush a multipath dev