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Status Functionality already exists
Workspace IBM i
Categories IFS (Integrated File System) and Servers
Created by Guest
Created on Jan 12, 2026

RELATED IDEAS

Path case sensitive inside iASP

To the best of my knowledge, the only case-sensitive paths in the IBM i Integrated File System are /QOPT and /QOpenSys.

In a configuration where an independent ASP (iASP) named IASP01 is present, once the iASP is mounted it is exposed in the IFS under the path /IASP01.

I would like to inquire whether it is technically possible, or if there are any plans to support, the creation of a case-sensitive directory within an iASP. For example, having a path such as /IASP01/QOpenSys, or any other case-sensitive directory structure under /IASP01.

This capability would be beneficial for workloads and applications that require POSIX-compliant, case-sensitive file systems to be hosted within an iASP.

 

Idea priority Medium
  • Guest
    Jan 20, 2026
    The IBM i file systems team believes that the requested function can already be achieved with the current system support. It is not the default, but a customer system can be configured with the requested behavior.

    As described in the section "User-defined file system and independent auxiliary storage pools" (https://www.ibm.com/docs/en/i/7.6.0?topic=udfsu-user-defined-file-system-independent-auxiliary-storage-pools), the '/dev/asp_name/QDEFAULT.UDFS' user-defined file system (UDFS) is automatically mounted over '/asp_name' when the IASP is varied on. After that, the default UDFS can be manually unmounted and another UDFS created with CASE(*MIXED) can then be mounted over the '/asp_name' directory. The sequence of steps for IASP01 would be:

    1) Vary-on IASP01
    2) Save all objects from '/IASP01'.
    3) CRTUDFS UDFS('/dev/IASP01/Mixed.UDFS') CASE(*MIXED)
    4) UNMOUNT TYPE(*UDFS) MNTOVRDIR('/IASP01')
    5) MOUNT TYPE(*UDFS) MFS('/dev/IASP01/Mixed.UDFS') MNTOVRDIR('/IASP01')
    6) Restore all objects saved in step 2 to '/IASP01'.

    You would have to repeat steps 4 and 5 every time you varied on IASP01, prior to any activity occurring in the IASP.

    Another option is a little more complicated up front, but then simpler going forward. The sequence of steps for this option:
    1) Vary-on IASP01
    2) Save all objects from '/IASP01'.
    3) Use DSPAUT '/dev/IASP01/QDEFAULT.UDFS' to note ownership and other authority information for the existing UDFS.
    4) UNMOUNT TYPE(*UDFS) MNTOVRDIR('/IASP01')
    5) RNM OBJ('/dev/IASP01/QDEFAULT.UDFS') NEWOBJ('OldQdefault.UDFS')
    6) CRTUDFS UDFS('/dev/IASP01/QDEFAULT.UDFS') CASE(*MIXED)
    7) Use WRKAUT or CHGAUT to set all authority values for the new UDFS to be the same as recorded in step 3.
    8) MOUNT TYPE(*UDFS) MFS('/dev/IASP01/QDEFAULT.UDFS') MNTOVRDIR('/IASP01')
    9) Restore all objects saved in step 2 to '/IASP01'.

    After this, your mixed-case UDFS will automatically be mounted over '/IASP01' every time the IASP is varied on. If everything looks good at this point, you could then DLTUDFS UDFS('/dev/IASP01/OldQdefault.UDFS').


    -- IBM i file systems team
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