Last mount point used by a VxFS filesystem

[Sundar_7]

I have an unmounted VxFS filesystem and would like to determine the last mountpoint used by it.

It is pretty straightforward when it comes to HFS but I cannot seem to get any pointers for the VxFS filesystems.

Is it true that the last mountpoint used is not recorded in the VxFS superblock (unlike HFS superblock) ?

I am willing to even write a simple C prog to query the structures but need to know the header file and the structure def.

TIA

Sundar.

[Kent Ostby]

Veritas does not have this field in their VxFS superblock.

The only possible way to get the information would be to restore an /etc/mnttab from the time that FS was on the box (to a different file name) and see if you could pull the information from there.

[Sameer_Nirmal · Accepted solution]

Hi,

Yes, VxFS doesn't keep a record of the last mount point used in its header.

The superblock and its copy resides in the Allocation Unit Header (similar to HFS's Cylinder Group. The superblock contents/fields could be known from the fs_vxfs man page.

Refer following link for vxfs disk layout for different versions.
http://uw713doc.sco.com/en/FS_admin/_vxfs_Disk_Layout.html

[RAC_1]

There is a way to know it apart from /etc/mnttab.....:-)

This would be with help of glance metrics. MWA collects data bout "data type lvolume" along with all other tons of metrics.

If you use report file to extract command as follows, this may give you what you want.

REPORT "MWA Export !DATE !TIME Logfile: !LOGFILE !COLLECTOR !SYSTEM_ID"
FORMAT ASCII
HEADINGS ON
SEPARATOR="|"
DATA TYPE LVOLUME
DATE
TIME
DAY
DATE_SECONDS

LV_DIRNAME
FS_DIRNAME

LV_SPACE_UTIL

Call this file test.

extract -v -xp -gapkdztncuyGADZTNUY -b "start_time" -e "end_time" -r ./test -f"output_file"

If you adjust start and end time accordingly, you should get what you want.

Hope this helps.

[RAC_1]

Sundar,

Even better would be following.

DATA TYPE FILESYSTEM

**........................... File System Record Identification Metrics

* BLANK
* RECORD_TYPE
* DATE
* TIME
* YEAR
* DAY
* DATE_SECONDS
* INTERVAL

**........................... File System Summary Metrics

* FS_DIRNAME

**........................... File System Disk Metrics

* FS_DEVNAME
* FS_TYPE
* FS_BLOCK_SIZE
* FS_MAX_SIZE
* FS_FRAG_SIZE
* FS_SPACE_UTIL


You know how to use them....

[Arunvijai_4]

Hi Sundar, You can find them using VEA log files. Header files are /opt/VRTS/include/sys/fs/vx_ioctl.h
/opt/VRTS/include/sys/fs/fcl.h
/opt/VRTS/include/sys/fs/vxio.h
/opt/VRTS/include/vxfsutil.h

-Arun