vx_maxlink kernel param?

[Michael Bouwma_2]

What is this and what should this be possibly be set at?

[Helen French · Accepted solution]

vx_maxlink: It's a JFS tunable parameter which is the number of subdirectories created with in a directory. The default value is 32767.

[Denver Osborn]

and don't set it higher than 65535. Also see the patch text from patch PHKL_21210 for details on vx_maxlink.

-denver

[Patrick Wallek]

From the PHKL_28117 information:

The maximum reference count of a directory is limited to LINK_MAX, currently defined as 32767. Hence it is not possible to create more than 32767 subdirectories.

Resolution:
A new tunable vx_maxlink has been added which will allow to increase the maximum number of subdirectories of a directory from 32767 to 65534. When the tunable is set to a value greater than 65534, the operating system will reset it to 65534. Note that some older applications which are using the st_nlink field of the stat structure as type "short" instead of "unsigned short" may see negative values on the link count of directories when tuning vx_maxlink above 32767.

[Michael Bouwma_2]

Thank you to all for the fast response