Linux安装device mapper多路径文档

1、Linux多路径安装步骤一、在 Linux AS4 Update 5 上安装多路径软件如果 AS4 采用默认安装到话，需要手动安装多路径软件。步骤如下：1) 在第四张 AS4 安装光盘上找到 device-mapper-multipath-0.4.5-21.RHEL4.i386 文件，运行下面的命令进行 安装：rpm -vh device-mapper-multipath-045-21.RHEL4.i3862) 安装完成后在 /etc 目录下可以看到 multipath.conf 的文件，编辑该文件，并添加以下的内容：6 / 5defaults udev_dir polling_interva

2、l selector/dev10round-robin 0path_grouping_policyfailovergetuid_callout/sbin/scsi_id -g -u -s /block/%nprio_callout/bin/truepath_checkerturrr_min_io100rr_weightuniformfailbackimmediateno_path_retry12user_friendly_names yesblacklist devnodeA(ram|raw|loop|fd|md|dm-|sr|scd|st)0-9*devnodeAhda-z0-9*devno

3、deAcciss!c0-9d0-9*device vendorIFTproduct*path_grouping_policygroup_by_priogetuid_callout/sbin/scsi_id -g -u -s /block/%npath_checkerturpath_selectorround-robin 0rr_weightuniformfailbackimmediatehardware_handler0no_path_retry12rr_min_io100注意： Vendor 项到 IFT 后面有五个空格3) reboot ，重启服务器4) 运行multipath -I命令，

4、如果看到类似以下的内容说明已经多路径已经绑定成功。下面的意思是将500G的磁盘设备sdb,sdc映射到了一个磁盘设备dm-2mpath1 (3600d0230ffffffff031b2b67151ab201) dm-2 IFT,F16F-R4031-4size=500Gfeatures=1 queue_if_no_pathhwhandler=0_ round-robin 0 prio=0active_ 7:0:1:0 sdb 8:16 activeready_ round-robin 0 prio=0enabled_ 8:0:1:1 sdc 8:32 activeready5) 运行 fdis

5、k -l 可以看映射好的 dm-2 磁盘Disk /dev/sda: 145.9 GB, 145999527936 bytes255 heads, 63 sectors/track, 17750 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesDevice BootStartEndBlocks Id System/dev/sda1 *113104391 83 Linux/dev/sda21417750142472452+ 8e Linux LVMDisk /dev/sdb: 536.8 GB, 536870912000 byte

6、s255 heads, 63 sectors/track, 65270 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesDevice Boot StartEnd Blocks Id System/dev/sdb11 250 2008093+ 83 Linux/dev/sdb2251 500 2008125 83 Linux/dev/sdb3501 36974 292977405 83 Linux/dev/sdb436975 65270 227287620 83 LinuxDisk /dev/sdc: 536.8 GB, 5368

7、70912000 bytes255 heads, 63 sectors/track, 65270 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesDevice Boot StartEnd Blocks Id System/dev/sdc11 250 2008093+ 83 Linux/dev/sdc2251 500 2008125 83 Linux/dev/sdc3501 36974 292977405 83 Linux/dev/sdc436975 65270 227287620 83 LinuxDisk /dev/dm-2:

8、536.8 GB, 536870912000 bytes255 heads, 63 sectors/track, 65270 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesDevice Boot StartEnd Blocks Id System/dev/dm-2p1250 2008093+ 83 Linux/dev/dm-2p2251500 2008125 83 Linux/dev/dm-2p3/dev/dm-2p4501 36974 292977405 83 Linux36975 65270 227287620 83 Li

9、nuxDisk /dev/dm-3: 2056 MB, 2056287744 bytes255 heads, 63 sectors/track, 249 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesDisk /dev/dm-4: 2056 MB, 2056320000 bytes255 heads, 63 sectors/track, 250 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesDisk /dev/dm-5: 300.0 GB, 300008862

10、720 bytes255 heads, 63 sectors/track, 36474 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytesDisk /dev/dm-6: 232.7 GB, 232742522880 bytes 255 heads, 63 sectors/track, 28296 cylindersUnits = cylinders of 16065 * 512 = 8225280 bytes6) 对分区进行分区和格式化文件系统 后就可以对磁盘进行操作了二、 CentOS 5.2 下安装多路径软件1. 运行rpm-

11、qa device-mapper-multipath-047-17.el5.i386 来查看系统是否安装了多路径软件，如果没有安装在 CentOS光盘上使用 rpm -vh device-mapper-multipath-047-17.el5.i386来安装多路径软件。2. 安装完成后在 /etc 目录下可以看到 multipath.conf 的文件，编辑该文件，并添加以下的内容：defaults udev_dir/devpolling_interval10selectorround-robin 0path_grouping_policyfailovergetuid_callout/sbin/

12、scsi_id -g -u -s /block/%nprio_callout/bin/truepath_checkerturrr_min_io100rr_weightuniformfailbackimmediateno_path_retry12user_friendly_names yes blacklist devnodeA(ram|raw|loop|fd|md|dm-|sr|scd|st)0-9*devnodeAhda-z0-9*devnodeAcciss!c0-9d0-9*device vendorIFTproductpath_grouping_policygroup_by_priogetuid_callout path_checker path_selector/sbin/scsi_id -g -u -s /block/%n turround-robin 0prio_callout rr_weight/sbin/mpath_prio_alua /d