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Disks

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The reported file length of all VMFS files (disk images) is 512 bytes longer than the disk

image. The additional 512 bytes contain certain file attributes such as the size of the

disk image represented by the file. VMFS files that are not disk images do not incur this

512-byte overhead.

Limitations

Disk images tend to be large. Unfortunately, the console operating system does not

support files greater than 4GB and there is only limited functionality for files between

2GB and 4GB. The file size field of the stat system call has only 32 bits, therefore

stat returns incorrect information for files equal to or bigger than 4GB. For such files,

VMFS returns 4GB-1 as the file size in the stat system call. NFS and scp are known

to run into this limitation, while FTP and cp are not affected by it.

VMFS files support standard permissions of read, write and execute for owner, group

and other. The files do not support setuid or setgid flags. The VMFS directory has the

same permissions as /tmp, which means that anyone can create a file in the

directory, but users can read or modify only those files for which they have

appropriate permissions.

Currently, VMFS file names are limited to 128 bytes.

For further information, see File System Management on SCSI Disks and RAID on

page 199.

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Red Hat NETSCAPE MANAGEMENT SYSTEM 4.5 Bedienungsanleitung Seite 207