How to configure the cdm probe to ignore filesystems, filesystem types and devices
Article ID: 129655
Updated On:
Products
Issue/Introduction
Customers often find it useful to be able to ignore specific filesystems, filesystem types, devices/drives in the cdm probe when setting up their disk/filesystem monitoring configuration in cdm.
Environment
- Any UIM version
Cause
- Sheer number of file systems
- Criticality of file systems
Resolution
There are settings which govern the matching of devices and mount points/filesystems/drives which can be changed via Raw Configure:
a) ignore_device = <to ignore devices>
Defines the devices to be excluded from monitoring.
b) ignore_filesystem = <to ignore mount-points/filesystems>
Defines the file system to be excluded from monitoring. For example, specify the regular expression C:\\ to exclude the C drive of the system from monitoring.
You can use the following regexes to ignore multiple filesystems/drives, in this case for C, D or E: drives as an example:
or
/[CDE]/
But, note that you MUST do the following for the GUI to refresh the true Status of the filesystem/drive when you configure it to be ignored:
- Click Ok, then Yes to restart the probe.
- Then double-click the cdm probe to reopen it and you will see which filesystems/drives are ignored. It is not enough to simply click Apply and then Update Status - the GUI has to be closed then reopened.
The ignored filesystems/drives will then display a red "x" on the filesystem/drive icon.
Also in cdm you can rt-click and delete the drives you've chosen to ignore, then restart or cold start, close and reopen the GUI and those filesystems/drives will not be discovered and they will remain ignored.
Using Raw Configure to edit these settings:
The raw configuration interface allows you to edit the configuration file or edit the data file. For example, the following keys can be configured from Raw Configuration:
ignore_device: ignores specified disks from monitoring. Navigate to the <disk> section and edit this key. For example, the following key values will ignore all automounted disks that are recognized on each “disk interval.”
Examples:
ignore_device = /autofsmount.*|.*:\/.*/
ignore_device = /^(\/proc|[A-Za-z0-9\-]+\:\/.*)/
ignore_filesystem: ignores specified file systems from monitoring. Navigate to the
<file> section and edit this key:
ignore_filesystem = /<regular expression>/
The value must be a regular expression that matches all disks or file systems or both.
The cdm IM GUI uses the mount entries as in /proc/mounts file in Linux to display the file system type of devices that are remounted to a different location.
c) Lastly, you also have the option of using Filesystem TYPE filter.
Filesystem 'Type' Filter: specifies the 'type' of the filesystem to be monitored using regular expressions.
In cdm v5.30 or higher, we added the filesystem 'type' filter feature:
Added a Filesystem Type Filter field to specify a regular expression and automatically select matching file system(s) to be monitored.
- If you specify regex as *, then all filesystems are enabled for monitoring. Or you can also specify ext* to allow monitoring of filesystems with "ext". For example ext4 or ext5.
The field->value, e.g., NTFS, ext3, etc. is case-sensitive and must match a filesystem type cdm has discovered.
- If you specify a NEGATIVE regex, then specified filesystems are excluded from monitoring. For example, if you do not want to monitor ext4 filesystem, use /^(?!ext4)/
Use filesystem_type_regex to ignore specific filesystem types. Here is one of the out of the box examples from the cdm probe:
filesystem_type_regex = /^(?!.*?(tmpfs|nfs|iso9660)).*/
Other examples for each parameter/option:
ignore_filesystem = /regex for filesystems to ignore/
/\/[dev|mnt]\/.*/
This will ignore all filesystems under /mnt and /dev which are "special" in that they are either device nodes or temporary). Notice the forward slashes in the regex are 'escaped.'
If this field is left blank, no filesystems are enabled for monitoring. (default)
For filesystem:
/var/www/html/rhel73
You could use:
/\/var\/www\/html\/rhel73\/.*/
to ignore it.
This example below will ignore all filesystems under /var and /dev
/\/(var|dev)\/.*/
This example below will ignore all filesystems that include /var and /dev anywhere in the path
/(\/run|\/dev)/
If you are trying to 'MATCH...'
/xxusers/abmedia
/opt/abmedia
Then use the following:
/\/(xxusers|opt)\/abmedia/
Another example:
/\/media\/(apps|data|prod)|\/backup/
This will exclude:
/media/apps
/media/data
/media/prod
/backup
Use:
/\/media\/*/
to exclude all mounted filesystems under /media
Use:
/\/dev\/sda.*/
to exclude all disk partitions for /dev/sda
Use:
/\/(dev|mnt)\/.*/
to exclude all disk partitions for /dev or /mnt
Use:
/\/dev\/loop.*/
to exclude all disks that are Mounted ISOs (/dev/loop#)
Use:
/^(\/proc|[A-Za-z0-9\-]+\:\/.*)/
Ignore the listed filesystems:
/^(?!)(nfs|hsfs|dev|ct|mnt|tmp|obj|share|lo|fd|pc|cd|cdr|pfs-hsfs|vmhg|iso9660)/
This will ignore all automounted disks that are recognized on each disk interval.
Here is an example of the options in the Infrastructure Manager (IM) GUI:
The corresponding entries are also available in the MCS - Setup CDM and Setup CDM (Enhanced) monitoring profiles available from the Monitoring tab of the DX UIM Operator Console:
Ignore filesystem
Here is another example which in this case was used to ignore all filesystems that begin with /export/home/bc or platform\/sun4v.
REGEX that works->> /^(\/export\/home\/bc.*|\/platform\/sun4v.*)$/
REGEX not working-> (/\/export\/home\/bc.*/|/\/platform\/sun4v.*/)
Note that in this "not working" case the parens were missing which in this case are required for the OR operations to work as expected.
Results:
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