This chapter describes the types and characteristics of file systems supported by ALTIBASE HDB, and necessary settings.
Supported File System
ALTIBASE HDB supports all major file systems except for some mmap and some file systems that do not support Direct I/O. In the case of using Direct I/O, it may be necessary to change the mount option to support direct I/O in the file system. When using in a file system that does not support direct I/O, the ALTIBASE HDB property must be changed. For detailed configuration, refer to the manual or the altibase.properties file.
OS | File System | Characteristic |
|---|---|---|
Solaris | UFS | When using Direct I/O, it is necessary to change the mount option
|
VxFS |
| |
ZFS | As Direct I/O is not supported, DB properties need to be changed.
| |
HP | HFS |
|
JFS | When using Direct I/O, it is necessary to change the mount option. | |
VxFS | When using Direct I/O, it is necessary to change the mount option. | |
AIX | JFS |
|
VxFS |
| |
Windows | NTFS |
|
FAT32 |
| |
Linux | Ext2/Ext3/Ext4 |
|
Unsupported File System
When using ALTIBASE HDB in some of the following file systems that do not support mmap or Direct I/O, a problem may occur.
Raw Storage Device
ALTIBASE HDB cannot be used because it cannot access files composed of raw devices. The purpose of using a raw device in the DB is to directly control the file cache function of the OS in the DB. For this purpose, ALTIBASE HDB can use a file system that supports Direct I/O instead of a raw device.
NFS(Network File System), NAS (Network-attached Storage )
In some NFS/NAS file systems that do not support mmap, errors may occur in the DB creation stage that creates data files and log files.