Configure multi-path in Linux

In Linux, configure the multi-path 1, install the multi-path software package: device-mapper-10267-2el5device-mapper-event-102672el5device-mapper-multipath-047-48el5 [plain] [root @ RKDB01Server] rpm-ivhdevi in Linux multi-path 1, install the multi-path software package: device-mapper-1.02.67-2.el5device-mapper-event-1.02.67.2.el5device-mapper-multipath-0.4.7-48.el5 [plain] [root @ RKDB01 Server] # rpm-ivh device-mapper-1.02.67-2.el5.x86_64.rpm warning: device-mapper-1.02.67-2.el5.x86_64.rpm: Header V3 DSA signature: NOKEY, key ID 37017186 Preparing... ######################################## ### [100%] package device-mapper-1.02.67-2.el5.x86_64 is already installed [root @ RKDB01 Server] # rpm-ivh device-mapper-event-1.02.67-2.el5.x86_64.rpm warning: device-mapper-event-1.02.67-2.el5.x86_64.rpm: Header V3 DSA signature: NOKEY, key ID 37017186 Preparing... ######################################## # # [100%] package device-mapper-event-1.02.67-2.el5.x86_64 is already installed [root @ RKDB01 Server] # rpm-ivh device-mapper-multipath-0.4.7-48.el5.x86_64.rpm warning: device-mapper-multipath-0.4.7-48.el5.x86_64.rpm: Header V3 DSA signature: NOKEY, key ID 37017186 Preparing... ######################################## ### [100%] package device-mapper-multipath-0.4.7-48.el5.x86_64 is already installe D 2. set boot and check whether the installation package is normal: chkconfig -- level 345 multipathd onlsmod | grep dm_multipath [plain] [root @ RKDB01 Server] # chkconfig -- level 345 multipathd on [root @ RKDB01 Server] # lsmod | grep dm_multipath 58969 0 scsisi_dh 42561 1 dm_multipath dm_mod 102417 4 dm_mirror, dm_multipath, dm_raid45, dm_log [root @ RKDB01 Server] #3. configure multipathd to make it work properly. edit/etc/multipath. conf: [plain] defaults {udev_dir /Dev polling_interval 10 selector "round-robin 0" initiate multibus routing "/sbin/scsi_id-g-u-s/block/% n" specify none path_checker readsector0 rr_min_io 100 max_fds 8192 rr_weight priorities failback immediate no_path_retry fail user_friendly_names yes} blacklist {wwid 26353900f02796769 devnode "^ (ram | raw | loop | fd | md | dm-| sr | scd | st) [0-9] * "devnode" ^ hd [a-z] "} 4. disable Content in [plain] # blacklist {# devnode "*" #}# defaults {27 # user_friendly_names yes 28 #} 5. after completion, run the following command to find the multi-path: [plain] [root @ RKDB01 Server] # modprobe dm-multipath [root @ RKDB01 Server] # multipath-F [root @ RKDB01 Server] # multipath dm-multipath [root @ RKDB01 Server] # multipath dm-round-robin [root @ RKDB01 Server] # service multipathd restart is shutting down the multipathd port monitoring program: [OK] starting the daemon multipathd: [OK] [root @ RKDB01 Server] # multipath-v2 [root @ RKDB01 Server] # multipath-v2 [root @ RKDB01 Server] # multipath-ll mpath1 (3600d02310000011b16a5d57c6a1bd99a) dm-0 TOYOU, netStor_iSUM510 [size = 3.3 T] [features = 0] [hwhandler = 0] [rw] \ _ round-robin 0 [prio = 2] [ena bled] \ _ 1: 0: 0: 0 sdb 8: 16 [failed] [ready] \ _ 1: 0: 1: 0 sdc [failed] [ready] [root @ RKDB01 Server] #6. after restarting the Server, we can see the multi-path information: [plain] [root @ RKDB01 ~] # Ll/dev/mapper/Total 0 crw ------- 1 root 10, 60 11-05 control brw-rw ---- 1 root disk 253, 0 11-05 mpath1 brw-rw ---- 1 root disk 253, 1 11-05 mpath2 [root @ RKDB01 ~] # Multipath-ll mpath2 (3600d02310000011b76128b9c63138cf4) DM-1 TOYOU, netStor_iSUM510 [size = 3.2 T] [features = 0] [hwhandler = 0] [rw] \ _ round-robin 0 [prio = 2] [active] \ _ 1: 0: 0: 1 sdc 8:32 [active] [ready] \ _ 1: 0: 1: 1 sde 8: 64 [active] [ready] mpath1 (3600d02310000011b16a5d57c6a1bd99a) dm-0 TOYOU, netStor_iSUM510 [size = 20G] [features = 0] [hwhandler = 0] [rw] \ _ round-robin 0 [prio = 2] [active] \ _ 1: 0: 0: 0 sdb 8: 16 [act Ive] [ready] \ _ 1: 0: 1: 0 sdd 8: 48 [active] [ready] 7. through fdisk, two DM-0/DM-1 disks can be generated, this is exactly what sdc/sde and sdb/sdd come up with: [plain] [root @ RKDB01 ~] # Fdisk-l Disk/dev/sda: 299.4 GB, 299439751168 bytes 255 heads, 63 sectors/track, 36404 cylinders Units = cylinders of 16065*512 = 8225280 bytes Device Boot Start End Blocks Id System/dev/sda1 * 1 38 305203 + 83 Linux/dev/sda2 39 13092 104856255 83 Linux/ dev/sda3 13093 19619 52428127 + 83 Linux/dev/sda4 19620 36404 134825512 + 5 Extended/dev/sda5 19620 26146 52428096 83 Linux/dev/sda6 26147 28757 20972826 83 Linux/dev/sda7 28758 30324 12586896 82 Linux swap/Solaris/dev/sda8 30325 36404 48837568 + 83 Linux Disk/dev/sdb: 21.4 GB, 21474836480 bytes 255 heads, 63 sectors/track, 2610 cylinders Units = cylinders of 16065*512 = 8225280 bytes Disk/dev/sdb doesn't contain a valid partition table Disk/dev/sdc: 3568.4 GB, 3568429957120 bytes 255 heads, 63 sectors/track, 433836 cylinders Units = cylinders of 16065*512 = 8225280 bytes Disk/dev/sdc doesn't contain a valid partition table Disk/dev/sdd: 21.4 GB, 21474836480 bytes 255 heads, 63 sectors/track, 2610 cylinders Units = cylinders of 16065*512 = 8225280 bytes Disk/dev/sdd doesn't contain a valid partition table Disk/dev/sde: 3568.4 GB, 3568429957120 bytes 255 heads, 63 sectors/track, 433836 cylinders Units = cylinde Rs of 16065*512 = 8225280 bytes Disk/dev/sde doesn't contain a valid partition table Disk/dev/dm-0: 21.4 GB, 21474836480 bytes 255 heads, 63 sectors/track, 2610 cylinders Units = cylinders of 16065*512 = 8225280 bytes Disk/dev/dm-0 doesn't contain a valid partition table Disk/dev/DM-1: 3568.4 GB, 3568429957120 bytes 255 heads, 63 sectors/track, 433836 cylinders Units = cylinders of 16065*512 = 8225280 bytes Disk/dev/DM-1 doesn't contain a valid partition table Disk/dev/sdf: 4009 MB, 4009754624 bytes 255 heads, 63 sectors/track, 487 cylinders Units = cylinders of 16065*512 = 8225280 bytes Device Boot Start End Blocks Id System/dev/sdf4 * 1 488 3915744 + B W95 FAT32 Partition 4 has different physical/logical endings: phys = (486,254, 63) logical = (487,125, 22) [root @ RKDB01 ~] #8. you can also view the multi-path ing information in the/dev/mapper Directory: [plain] [root @ RKDB01 ~] # Ll/dev/mapper/Total 0 crw ------- 1 root 10, 60 11-06 control brw-rw ---- 1 root disk 253, 2 11-06 data-data001 brw-rw ---- 1 root disk 253, 0 11-06 mpath1 brw-rw ---- 1 root disk 253, 1 11-06 mpath2