i read something from docs:5971-2383,what's the mean of disk layout?

[常有慈悲心]

HP-UX Release JFS Version Disk LayoutVersion Maximum
Supported File
Size
Maximum
Supported File
System Size
10.01 JFS 2.0 Version 21 2 GB 4 GB
10.10 JFS 2.0 Version 21 2 GB 128 GB
10.20 JFS 3.0 Version 2 2 GB 128 GB
10.20 JFS 3.0 Version 31 128 GB 128 GB
11.00 JFS 3.1 Version 2 2 GB 128 GB
11.002 JFS 3.1 Version 31 1 TB 1TB
11.00 JFS 3.3 Version 2 2 GB 128 GB
11.00 JFS 3.3 Version 31 1 TB 1 TB
11.00 JFS 3.3 Version 4 1 TB 1 TB
11i V1 JFS 3.3 Version 2 2 GB 128 GB
11i V1 JFS 3.3 Version 3 2 TB 2 TB
11i V1 JFS 3.3 Version 41 2 TB 2 TB
11i V1.5 JFS 3.3 Version 41 2 TB 2 TB
11i V1 JFS 3.5 Version 4 2 TB 2 TB
11i V1.6 JFS 3.5 Version 4 2 TB 2 TB
11i V23 JFS 3.5 Version 5 2 TB 12 TB
Table 2: JFS (VxFS) Supported File and File System Sizes

[Jeff Schussele · Accepted solution]

Hi,

Those are simply the maximum file and filesystem sizes, respectively, supported by those combinations of OS and JFS versions.

HTH,
Jeff

[Geoff Wild]

Disk Layout is the version of vxfs...

For example - it is version 3 on HP-UX 11.0 and Version 4 in 11i.

However, you can explicitly set it at file system creation like so:

mkfs -F vxfs -o largefiles -o version=3 /dev/vg56/rlvwork

Rgds...Geoff

[常有慈悲心]

but according this file,
the version of JFS and disk layout version are different

[Jeff Schussele]

Just appears to be a typo to me.
11iv2 is in fact 11.23 and it's brand new.
What's confusing is that 11iv1.6 is *also* known as 11.23 as has been for some time.

HTH,
Jeff

[Geoff Wild]

That is correct - JFS does NOT equal disk layout.

They are different concepts so to speak.

From mkfs_vxfs man page:

mkfs builds a file system with a root directory and a lost+found
directory (see fsck_vxfs(1M)). The file system can have disk layout
Version 2, disk layout Version 3, or disk layout Version 4. Version 2
supports dynamic inode allocation. Version 3 adds support for large
files and large UIDs. Version 4 adds support for Access Control
Lists. On HP-UX 11.1x systems, the default is Version 4. On HP-UX
11.0 systems, the default is Version 3. You can choose the disk
layout version with the version=n option (see below).


Rgds...Geoff

[常有慈悲心]

thanks everyone,
i find a good article:
http://docs.hp.com/hpux/onlinedocs/5576/JFS_Tuning.pdf