DB2 and disk block size of 4096 on AIX

Be careful if you are planning to migrate a db2 system from one server to another with different disks on AIX.
DB2 v10 only support block disk sizes of 512, not possible to change.
Only DB2 v11.5 support, so you either will need disks with blocks of 512 or you will need upgrade to this new version.
On AIX if you have a RAID system with 4K disk it will create a final disk with 4K block size, is not possible to change.

Cause

  • DB2 up to v10.5: only supports file system or devices with Block and Sector Sizes of 512 bytes

  • DB2 v11.1 M4 FP4: Technical preview for 4KB sector size for non-production systems via DB2 registry variable DB2_4K_DEVICE_SUPPORT

  • DB2 v11.5: Supports 4KB sector size

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