Creating Data Drives

Method 1: Using fdisk to Create a Data Drive

1. Create a partition, for example, /dev/nvme0n1.

   1	fdisk /dev/nvme0n1

2. Type p (print the partition table) and press Enter to display the current partition.
3. Type n (add a new partition) and press Enter.
4. Type p (create a primary partition) and press Enter.
5. Type 1 (set the partition number to 1) and press Enter.
6. Press Enter to retain the default setting for the first partition.
7. Press Enter to retain the default setting for the last partition.
8. Type p (print the partition table) and press Enter to display the current partition.

   

9. Type w to save the settings and press Enter.
10. Create a file system, for example, xfs.

    1	ls /dev/nvme*mkfs.xfs -f /dev/nvme0n1p1

11. Mount the partition to /data of the OS.

    1	mkdir /datamount /dev/nvme0n1p1 /data

12. Edit /etc/fstab to enable the data drive to be automatically mounted after the OS is restarted.
    1. Open /etc/fstab.

       vim /etc/fstab

    2. Press i to enter the insert mode and add the following content to the file:

       /dev/sdb1  /data	xfs defaults 1 2

       In the preceding command, /dev/sdb1 is only an example. See the following figure for the added content:

       

    3. Press Esc, type :wq!, and press Enter to save the file and exit.

Method 2: Using LVM to Create a Data Drive

Install the LVM2 package (contained in the image) and create a data drive as follows:

1. Install LVM2.

   For details about how to configure the yum source, see Configuring the Yum Source in the Greenplum Porting Guide.

   1	yum -y install lvm2

2. Create a physical volume, for example, sdb.

   1	pvcreate /dev/sdb

3. Create a physical volume group, for example, datavg.

   1	vgcreate datavg /dev/sdb

4. Create a logical volume, for example, datalv of 600 GB.

   1	lvcreate -L 600G -n datalv datavg

5. Create a file system.

   1	mkfs.xfs /dev/datavg/datalv

6. Create a data directory and mount it.

   1 2	mkdir /data mount /dev/datavg/datalv /data

7. Edit /etc/fstab to enable the data drive to be automatically mounted after the OS is restarted.
   1. Open /etc/fstab.

      vim /etc/fstab

   2. Press i to enter the insert mode and add the following content to the file:

      /dev/datavg/datalv /data xfs defaults 1 2

      In the last line, /dev/datavg/datalv is only an example. See the following figure for the added content:

      

   3. Press Esc, type :wq!, and press Enter to save the file and exit.