Creating a DataKeeper Resource

This section describes how to create a DataKeeper resource. DataKeeper resources provide the ability to build highly available clusters without the use of shared storage.

System Configuration

The environment created in this guide has the following two-node configuration. Create a mirror on your new file system and protect it with LifeKeeper.

Make sure that your configuration satisfies the following DataKeeper requirements.
Hardware and Software Requirements

Perform the following steps on “target1” and “target2”

1. Checking the device

# parted /dev/sdb print
Model: VMware Virtual disk (scsi)
Disk /dev/sdb: 1074MB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:
　
Number  Start  End  Size  File system  Name  Flags

2. Creating a partition
   Create a partition in /dev/sdb of the device.

# parted -s /dev/sdb mklabel gpt
# parted /dev/sdb mkpart primary 0% 100%
# parted /dev/sdb print
Model: VMware Virtual disk (scsi)
Disk /dev/sdb: 1074MB
Sector size (logical/physical): 512B/512B
Partition Table: gpt
Disk Flags:
　
Number  Start   End     Size    File system  Name     Flags
 1      1049kB  1073MB  1072MB  ext4         primary

Perform the following steps on the “target1”

1. Creating a resource
   Execute the following command:

[target1]# lkcli resource create dk --tag dk-tag --mode synchronous --hierarchy new --device /dev/sdb1 --fstype xfs --mount_point /mnt/dk --fstag fs-tag

Resource settings

2. Extending a DataKeeper resource
   Execute the following command:

[target1]# lkcli resource extend dk --tag dk-tag --dest target2 --mode synchronous --laddr 10.1.6.88 --raddr 10.1.6.89

Resource settings

3. Extending a file system resource
   Execute the following command:

[target1]# lkcli resource extend fs --tag fs-tag --dest target2

Resource settings

4. Checking the resource
   After creating and expanding the resource, run the following command.
   The resource information is returned.

[target1]# lkcli status -q
　
LOCAL   TAG           ID                                   STATE     PRIO  PRIMARY
target1 fs-tag        /mnt/dk                              ISP          1  target1
target1  dk-tag       36000c292eb0c693b2efb44ed56556636-1  ISP          1  target1

A DataKeeper resource is automatically created with the file system resource dependent on the upper level as shown above.

5. Check the mirroring
   Once the DataKeeper resource has been created, a full resync will be performed.
   When the status is Fully Operational, the full resync is completed.

[target1]# lkcli mirror status --tag dk-tag

Resource settings

Export/Import a DataKeeper Resource

Refer to Replicate the Existing Cluster Settings to replicate the DataKeeper resource and the file system resource. Execute import with the file system unmounted on each node.