Is it possible to change the logical or phyiscal block size on disks?

Solution Verified - Updated -

Issue

  • What is recommended sector size for a disk?
  • How can we change sector size of a disk from 512 Bytes to 4096 Bytes?
  • Is it possible to change the block size on SCSI disk devices? The blockdev command in RHEL provides information about currently used block size for SCSI disk, is there any utility/command to change block size?

    $ blockdev --getbsz /dev/sdab
    4096
    $ blockdev --getbsz /dev/sdac
    4096
    $ blockdev --getbsz /dev/sdag
    4096
    $ blockdev --getbsz /dev/sdar
    4096
    $ blockdev --getbsz /dev/sdak
    4096
    
  • How do I modify the block size of a disk device?

  • How can I change the block size to 4Kb for a disk device? The device currently shows 512 bytes.
  • How can I change the block size to 8Kb for a disk device?
  • How can I change the block size to 16Kb for a disk device?
  • How can I change the block size to 128Kb for a disk device?

Environment

  • Red Hat Enterprise Linux (RHEL) 5, 6, 7, 8, 9
  • SCSI disk(s)
  • ATA disk(s)

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