Migrating logs to an Advanced Format disk on Windows

An Advanced Format disk is one that has 4096 bytes per sector. The following is applicable only to the Windows platform as Advanced Format disks can be used on other platforms, without carrying out a migration procedure.

• A migrated log can be used on any disk whether or not it is Advanced Format.
• If you are not using an Advanced Format disk, we do not need to migrate the log of your queue manager.
• Queue managers that are created at IBM MQ Version 9.0.4 can be used on an Advanced Format disk without being migrated.
• If we use a queue manager that was created before Version 9.0.4 on a native Advanced Format disk, without migrating the queue manager first, the queue manager will not start
• It is possible to start a queue manager on an Advanced Format disk in emulation mode without migration. However IBM MQ log writes will not be on 4k boundaries and so the queue manager will not have data integrity. Once the logs have been migrated, an Advanced Format disk in emulation mode is reliable.
• If you are not sure whether your disk is Advanced Format or not, use the Windows utility fsutil to find out.
• The Advanced Format disks that require you to migrate your log, include 4k native disks and 512-byte Emulation disks.
• Use migmqlog to change from linear logging to circular logging, or from circular logging to linear logging, also migrates the log so that the log can be used on an Advanced Format disk.