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关于HTFS\EAFS\AFS
都是SCO支持的文件系统类型
The EAFS (Extended Acer Fast Filesystem) is the default filesystem used by SCO UNIX Operating System Versions 2.0 and 3.0, and is also the default filesystem for the boot filesystem (/stand) on SCO OpenServer products.
* Uses checkpointing and intent logging.
* Supports long filenames and symbolic links.
* Has 65,488 inodes per filesystem (less than 2^16).
* Has a 2GB maximum for file and filesystem size.
* Uses 1KB logical data blocks.
* Is a bootable filesystem and is used when creating the boot
filesystem.
The HTFS (High Throughput Filesystem) is a new filesystem for SCO OpenServer systems. It transparently provides significant performance improvement by using caching to increase data throughput. This is the default filesystem for the SCO OpenServer Host and Enterprise.
* Uses checkpointing. The filesystem is marked clean at regular
intervals. If a filesystem is marked clean when the system
halts, it may not be necessary for it to be checked by
fsck(ADM).
* Uses intent logging. The filesystem transactions are
recorded in a log and then committed to disk. This increases
system recovery speed with a very small performance penalty.
Intent logging works in tandem with checkpointing
* Uses versioning to allow users to undelete a file.
* Supports long filenames and symbolic links.
* Has a maximum 134,000,000 inodes per filesystem.
* Has a maximum file size of 2GB and a maximum filesystem
size of 1 terabyte.
* Has a logical data block of 1KB.
* Is not a bootable filesystem.
The DTFS (Desktop Filesystem) is designed for use on laptop, desktop, and notebook computers. This is the default filesystem for the SCO OpenServer Desktop product.
* Uses transparent data compression and a more efficient disk
media format to increase the storage capacity of your disks.
* Supports long names and symbolic links.
* Can contain either user data or an inode on any block on the
disk. The number of inodes in the filesystem can grow as
necessary and is limited to the size of the partition.
* Has a maximum file size of 2GB and a maximum filesystem size
of 1 terabyte.
* Uses a variable block size that is a multiple of 512 bytes up
to 4KB. This helps minimize wasted space at the end of
incomplete blocks.
* Is not a bootable filesystem.
Other filesystems that are supported by SCO are included in the following list. Note that support for the AFS and S51K filesystems are installed by default and do not need to be linked into the kernel.
* AFS (Acer Fast Filesystem)
* S51K Filesystem.
* High Sierra/ISO9660/Rockridge CD-ROM Filesystem.
* DOS Filesystem.
* NFS (Network Filesystem)
* NUCFS (NetWare for UNIX Clients Filesystem)
* LMCFS (LAN Manager Client Filesystem)
* XENIX
The following is a summary of the supported filesystem types:
- Check- Intent
- Filesystem|Bootable| Versioning |pointing|logging| Advantages
- -------------|-----------|---------------|----------|----------|---------------------
- | | | | | Backwards
- AFS | X | | X | X | compatibility
- -------------|-----------|---------------|----------|----------|---------------------
- | | | | | Used to create
- EAFS | X | | X | X | boot filesystem
- -------------|-----------|--------------|-----------|----------|---------------------
- | | | | | Uses data compression
- DTFS | | X | X | X | to save disk space
- -------------|-----------|--------------|-----------|----------|---------------------
- | | | | | Defaults use caching
- HTFS | | X | X | X | for high performance
- -------------|-----------|--------------|-----------|----------|---------------------
- | | | | | Backwards
- S51K | X | | X | | compatibility
- -------------|-----------|--------------|-----------|----------|---------------------
- | | | | | Backwards
- XENIX | X | | | | compatibility
- -------------|-----------|--------------|----------|----------|---------------------
- | | | | | Eliminate need
- DOS | | | | | for DOS utilities
- -------------|-----------|--------------|----------|----------|---------------------
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发表于 2005-01-05 15:40
