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fdisk

Disk /dev/sda: 465.76 GiB, 500107862016 bytes, 976773168 sectors
Disk model: Samsung SSD 850 
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: gpt
Disk identifier: A89BC90C-6B0B-4EEB-AECF-EF8368247834

Partition alignment is used to align the logical and physical sizes of sectors

The processor reads the first sector. Of them:

446 bytes for loader (for processor) 
64 bytes 4x16 bytes allocated for (CHS):
 1 - 0x00, 0x80 (boot)  
 5 - disk id
 8-12 - start sector  
 13-16 - sectors  
2 bytes - for MBR signature:  
 0x55 0xaa - this seems to mean that everything is OK

Question about superblock

cat /proc/partitions

#block = 1024b

Resize partition

  • fdisk
  • recreate the partition, specifying a new size
  • cat /proc/partitions
  • partprobe
  • resize2fs /dev/sda1
  • lvresize /dev/mapper/disk -L 25G
  • virsh blockresize ...
  • delete a partition, create a partition
  • partprobe