Size Restrictions on UFS File Systems

Total Size

The limit on the total size of a file system is 1 Tbyte. A UFS file system can be as big as the slice that holds it.

Maximum File Size

The maximum size for any one file in a UFS file system depends on the way the file system is configured.

Maximum Number of Files

The maximum number of files per UFS file system is determined by the number of inodes allocated for a file system. The number of inodes depends on how much disk space is allocated for each inode and the total size of the file system. By default, one inode is allocated for each 2 Kbyte of data space. You can change the default allocation using the -i option of the newfs command.

Logical Block and Fragment Size

Fragments are small logical blocks that are created to save space by reducing unused portions of logical blocks. The maximum logical block and fragment size is 8192 bytes, although fragments are typically less than or equal to the size of logical blocks.