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AIX: Unable to mount file system. Getting "mount: 0506-334" error.

Question & Answer


Question

Why can't I mount my file system?
# mount /testfs
mount: 0506-334 /testfs is not a known file system.
 

Cause

This error is commonly seen when there is an issue with the file system's stanza in /etc/filesystems file, for example, a missing stanza.

Answer

When you create a file system, it is expected that a mount point is created for the logical volume and the /etc/filesystems file is updated with the file system's stanza.
The following is an example of the expected output where /testfs is the mount point for logical volume /dev/fslv02 and /etc/filesystems has the stanza for /testfs:
# lsvg -l rootvg | grep fslv02
fslv02              jfs2       2       2       1    closed/syncd  /testfs
# lsfs /testfs
Name            Nodename   Mount Pt               VFS   Size    Options    Auto Accounting
/dev/fslv02     --         /testfs                jfs2  1048576 rw         yes  no
If the /etc/filesystems stanza for the file system is missing, you might see the following output instead:
# lsvg -l rootvg | grep fslv02
fslv02              jfs2       2       2       1    closed/syncd  N/A
# lsfs /testfs
lsfs: 0506-915 No record matching /testfs was found in /etc/filesystems.
To repopulate /etc/filesystems with the file system's stanza, use the imfs command. The imfs method is preferred instead of a manual edit since imfs uses information stored in the logical volume control block to repopulate /etc/filesystems.  
Caution: Do not run crfs command in an attempt to create the mount point since it formats the logical volume and causes data loss. If you run crfs, the only way to recover is to restore the file system data from a good backup.

In our example, first check that the label for the fslv02 logical volume is indeed /testfs.
# getlvcb -AT fslv02
         AIX LVCB
         intrapolicy = m
         copies = 1
         interpolicy = m
         lvid = 00f63f5d00004c000000016983aa827f.6
         lvname = fslv02
         label = /testfs
         machine id = 63F5D4C00
         number lps = 2
         relocatable = y
         strict = y
         stripe width = 0
         stripe size in exponent = 0
         type = jfs2
         upperbound = 32
         fs = vfs=jfs2:log=/dev/hd8:mount=true:options=rw:account=false
         time created  = Wed Oct  6 10:58:38 2021
         time modified = Wed Oct  6 10:58:42 2021
Next, run the imfs command to repopulate the stanza for fslv02.
# imfs -l /dev/fslv02

Now, check that the stanza is added. Any errors in running the imfs warrants a closer look at /etc/filesystems.
# lsfs /testfs
Name            Nodename   Mount Pt               VFS   Size    Options    Auto Accounting
/dev/fslv02     --         /testfs                jfs2  1048576 rw         yes  no
We can now mount /testfs:

# mount /testfs
# df /testfs
Filesystem    512-blocks      Free %Used    Iused %Iused Mounted on
/dev/fslv02      1048576   1047760    1%        4     1% /testfs
SUPPORT:
If more assistance is required, follow these instructions to open a support case for software under warranty or with an active and valid support contract.  
a.  Document or take screen captures of all symptoms, errors, and messages that occurred.
b.  Capture any logs or data relevant to the situation.
c.  Contact IBM to open a case:
   -For electronic support, visit the IBM Support Community:
     https://www.ibm.com/mysupport
   -If you require telephone support, visit the web page:
      https://www.ibm.com/planetwide/
d.  Provide a good description of your issue and reference this technote
e.  Upload all of the details and data to your case
   -You can attach files to your case in the IBM Support Community
   -Or Upload data to IBM secured support server for analysis:
    http://www.ibm.com/support/docview.wss?uid=ibm10733581

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Document Information

Modified date:
12 October 2021

UID

ibm16497045

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