20.6 Notes

1. Data DB area files cannot be created in a file system that does not support direct I/O.

2. If you want to add DB areas or you want to add DB area files to existing DB areas after you have completed initialization of a database by executing the adbinit command, you must use one of the following methods to modify the DB area structure:

   • Execute the adbmodarea command to add DB areas and DB area files.

   • Re-executing the adbinit command to re-initialize the database.

3. If you use block special files, specify block special files that have been created by LVM or device names that begin with /dev/disk/ according to HADB's path naming rules.

   When you will be using the multi-node function, specify a device name beginning with /dev/disk/by-id/wwn- for a DB area file that will be shared among nodes. For details, see 20.3.2 Creating DB directories (when using the multi-node function).

4. If a disk is added but is not recognized by the OS, restart the OS to let it recognize the disk. When the disk is recognized by the OS, block special files can be used.

5. When you will be using the multi-node function, use the OS command to initialize the file system for the system directory before you execute the adbinit command. For details, see the topic Creating a database in Building a system that uses the multi-node function in Operations When Using the Multi-Node Function in the HADB Setup and Operation Guide.

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