How to partition a disk after a LUN is mounted to a Linux host

How to partition a disk after mounting LUNs on the array to a Linux host, method reference https://www.ibm.com/developerworks/cn/linux/l-lpic1-v3-104-1/

fdiskcommand to create, modify, or delete partitions on a block device

1. list disk Partitions fdisk-l DEV/SDA

2. Start Fdisk

[email protected]:~$ su - [email protected]:~# fdisk /dev/sda The number of cylinders for this disk is set to 121601. There is nothing wrong with that, but this is larger than 1024, and could in certain setups cause problems with: 1) software that runs at boot time (e.g., old versions of LILO) 2) booting and partitioning software from other OSs     (e.g., DOS FDISK, OS/2 FDISK) Command (m for help): 3. Fdisk Help Command (m for help): m Command action     a   toggle a bootable flag     b   edit bsd disklabel     c   toggle the dos compatibility flag     d   delete a partition     l   list known partition types     m   print this menu     n   add a new partition     o   create a new empty DOS partition table     p   print the partition table     q   quit without saving changes     s   create a new empty Sun disklabel     t   change a partition‘s system id     u   change display/entry units     v   verify the partition table     w   write table to disk and exit     x   extra functionality (experts only) Command (m for help): 4. Display the list of existing partitions Command (m for help): p Disk /dev/sda: 1000.2 GB, 1000204886016 bytes 255 heads, 63 sectors/track, 121601 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk identifier: 0x000de20f     Device Boot      Start         End      Blocks   Id  System /dev/sda1   *           1        9111    73184076    7  HPFS/NTFS /dev/sda2            9634        9730      779152+  83  Linux /dev/sda3            9731      116679   859067842+   5  Extended /dev/sda5            9731       20917    89859546   83  Linux /dev/sda6           20918       39644   150424596   83  Linux /dev/sda7           39645       53905   114551451   83  Linux Command (m for help): 5. Create a partition Command (m for help): n Command action     l   logical (5 or over)     p   primary partition (1-4) p Selected partition 4 First cylinder (9112-121601, default 9112): Using default value 9112 Last cylinder, +cylinders or +size{K,M,G} (9112-9633, default 9633): +521 Command (m for help): p Disk /dev/sda: 1000.2 GB, 1000204886016 bytes 255 heads, 63 sectors/track, 121601 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk identifier: 0x000de20f     Device Boot      Start         End      Blocks   Id  System /dev/sda1   *           1        9111    73184076    7  HPFS/NTFS /dev/sda2            9634        9730      779152+  83  Linux /dev/sda3            9731      116679   859067842+   5  Extended /dev/sda4            9112        9633     4192965   83  Linux /dev/sda5            9731       20917    89859546   83  Linux /dev/sda6           20918       39644   150424596   83  Linux /dev/sda7           39645       53905   114551451   83  Linux Partition table entries are not in disk order Command (m for help):

How to partition a disk after a LUN is mounted to a Linux host