fdisk and lsblk report different disk size
Create an i2.4xlarge instance, SSH into the instance and run “sudo fdisk -l” and then “lsblk”. Compare the outputs:
[ec2-user@ip-172-31-5-22 ~]$ sudo fdisk -l WARNING: fdisk GPT support is currently new, and therefore in an experimental phase. Use at your own discretion. Disk /dev/xvda: 8589 MB, 8589934592 bytes, 16777216 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk label type: gpt # Start End Size Type Name 1 4096 16777182 8G Linux filesyste Linux 128 2048 4095 1M BIOS boot parti BIOS Boot Partition Disk /dev/xvdb: 800.2 GB, 800165027840 bytes, 1562822320 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk /dev/xvdc: 800.2 GB, 800165027840 bytes, 1562822320 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk /dev/xvdd: 800.2 GB, 800165027840 bytes, 1562822320 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk /dev/xvde: 800.2 GB, 800165027840 bytes, 1562822320 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes [ec2-user@ip-172-31-5-22 ~]$ df -m Filesystem 1M-blocks Used Available Use% Mounted on /dev/xvda1 7934 1062 6774 14% / devtmpfs 61475 1 61475 1% /dev tmpfs 61483 0 61483 0% /dev/shm
As we can see, the size reported by fdisk is calculated using the following equation:
size = sectors x bytes per sector
1562822320 sectors x 512 bytes per sector = 800,165,027,840 bytes = 800.2 GB
[ec2-user@ip-172-31-5-22 ~]$ lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT xvda 202:0 0 8G 0 disk └─xvda1 202:1 0 8G 0 part / xvdb 202:16 0 745.2G 0 disk xvdc 202:32 0 745.2G 0 disk xvdd 202:48 0 745.2G 0 disk xvde 202:64 0 745.2G 0 disk
With lsblk, the equation is:
size = bytes / 1024 / 1024 / 1024
800,165,027,840 bytes / 1024 / 1024 / 1024 = 745.2 GB
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