Shulou(Shulou.com)06/01 Report--

Create an asm disk using multipath

There are various ways to create asm disks. For standardization, this paper adopts the combination of multipath and udev to manage asm disks. Suitable for linux6, linux7, multipath or single path.

The following operations use oracle linux 7 as an example.

1. Install multipath softwar

The yum source uses an Oracle official source or a local iso source

[root@oel7 ~] # yum provides multipath

Loaded plugins: ulninfo

Device-mapper-multipath-0.4.9-119.el7.x86_64: Tools to manage multipath devices using device-mapper

Repo: dbinstall

Matched from:

Filename: / usr/sbin/multipath

# yum install device-mapper-multipath-0.4.9-119.el7.x86_64

two。 Load module & create a configuration file

The initial installation requires loading the dm module

# modprobe dm-multipath

# modprobe dm-round-robin

# cp / usr/share/doc/device-mapper-multipath-*/multipath.conf / etc/multipath.conf

3. Edit configuration file / etc/multipath.conf

Devices {

Device {

Vendor "VMware,"

Product "VMware Virtual S"

Path_grouping_policy multibus

Path_checker readsector0

Path_selector "round-robin 0"

Hardware_handler "0"

Failback 15

Rr_weight priorities

No_path_retry queue

}

}

Multipaths {

Multipath {

Wwid 36000c29b9e405c3d07021157ace9ab9f

Alias asm_data01

}

Multipath {

Wwid 36000c2933be13ffabcb0ce90806ea5dd

Alias asm_fra01

}

}

4. View multipath Devic

Restart the service

# systemctl restart multipathd

# multipath-ll

Because it is a virtual machine and non-multipath, no related devices are generated. At this point we manually add wwid to the multipath repository. If it is true multipath, you do not need to add it manually.

Multipath-a / dev/sdb

Multipath-a / dev/sdc

Restart the service again

# systemctl restart multipathd

View Devic

# multipath-ll

Asm_fra01 (36000c2933be13ffabcb0ce90806ea5dd) dm-3 VMware, VMware Virtual S

Size=10G features='1 queue_if_no_path' hwhandler='0' wp=rw

`- +-policy='round-robin 0' prio=1 status=active

`- 0 sdc 0lV 2RO sdc 8:32 active ready running

Asm_data01 (36000c29b9e405c3d07021157ace9ab9f) dm-2 VMware, VMware Virtual S

Size=30G features='1 queue_if_no_path' hwhandler='0' wp=rw

`- +-policy='round-robin 0' prio=1 status=active

`- 0VOVUR 1RU 0sdb 8:16 active ready running

5. Configure udev rules

So much work has been done to make the configuration of udev rules simple.

Let's take a look at the device features managed by multipath.

[root@oel7] # udevadm info-Q all-n / dev/mapper/asm_data01

P: / devices/virtual/block/dm-2

N: dm-2

L: 10

S: disk/by-id/dm-name-asm_data01

S: disk/by-id/dm-uuid-mpath-36000c29b9e405c3d07021157ace9ab9f

S: disk/by-label/DATA1

S: mapper/asm_data01

E: DEVLINKS=/dev/disk/by-id/dm-name-asm_data01 / dev/disk/by-id/dm-uuid-mpath-36000c29b9e405c3d07021157ace9ab9f / dev/disk/by-label/DATA1 / dev/mapper/asm_data01

E: DEVNAME=/dev/dm-2

E: DEVPATH=/devices/virtual/block/dm-2

E: DEVTYPE=disk

E: DM_MULTIPATH_TIMESTAMP=1536682254

E: DM_NAME=asm_data01

E: DM_SUSPENDED=0

E: DM_UDEV_DISABLE_LIBRARY_FALLBACK_FLAG=1

E: DM_UDEV_PRIMARY_SOURCE_FLAG=1

E: DM_UDEV_RULES_VSN=2

E: DM_UUID=mpath-36000c29b9e405c3d07021157ace9ab9f

E: ID_FS_LABEL=DATA1

E: ID_FS_LABEL_ENC=DATA1

E: ID_FS_TYPE=oracleasm

E: ID_FS_USAGE=filesystem

E: MAJOR=249

E: MINOR=2

E: MPATH_SBIN_PATH=/sbin

E: SUBSYSTEM=block

E: TAGS=:systemd:

E: USEC_INITIALIZED=83840

Using the shading part to make udev rules

Cat > > / etc/udev/rules.d/99-oracle-asmdevices.rules

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.