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Threshold Alerts notification sent despite sufficient disk space in InterScan Web Security Virtual Appliance (IWSVA) 6.5

    • Updated:
    • 28 Nov 2018
    • Product/Version:
    • InterScan Web Security Virtual Appliance 6.5
    • Platform:
    • N/A N/A
Summary

The Threshold Alerts notification for "Hard Drive" is sent to the administrator even though InterScan Web Security Virtual Appliance (IWSVA) has sufficient disk space and has not yet reached the threshold.

This article explains why the issue occurs and the workaround.

Details
Public

IWSVA uses /var/iwss/tmp/v_tmpfs as tmpfs (in-memory file system) temporary directory to extract compressed files during the scan. "Hard Drive" in Threshold Alerts also monitors this partition.

The size of /var/iwss/tmp/v_tmpfs is 512 MB by default regardless of the size of the actual hard drive. Therefore, scanning many compressed files or a compressed file including many files might decrease the space of /var/iwss/tmp/v_tmpfs and trigger the notification.

To alleviate the issue, do either of the following:

Pro(s)

  • Any impact on the performance is quite unlikely because this just increases the maximum size of the tmpfs directory.

Con(s)

  • Additional memory might be necessary, and the amount depends on the circumstances of your IWSVA. For example, you should add 2 GB of memory if you increase the size of v_tmpfs by 2 GB.
  • The change might be reverted into the default value after applying a Hot fix or a Patch. You need to change the value again after that.

To increase the size of /var/iwss/tmp/v_tmpfs:

  1. Stop all of the IWSVA services.

    # /etc/iscan/rcIwss stop

    Note: This will interrupt the network traffic for a few minutes so plan accordingly.
  2. Use vi to edit the file /etc/iscan/S99ISproxy:

    #vi /etc/iscan/S99ISproxy

    The default value is:

    ----------------------------------   mount tmpfs $V_TMPFSDIR -t tmpfs -o size=512M  ---------------------------------- 

    To change the size to 2 GB modify it as following:

    ----------------------------------  mount tmpfs $V_TMPFSDIR -t tmpfs -o size=2G   ---------------------------------- 

Pro(s)

  • IWSVA can use the free space of the actual hard drive so this prevents IWSVA from sending the Threshold Alerts notification. As a reference, IWSVA 6.5 earlier than Service Pack 2 uses the hard drive directory as the temporary directory.

Con(s)

  • Compared with using the v_tmpfs directory, the performance for scanning compressed files is affected because of using the hard drive.

To change the temporary directory:

  1. Stop all of the IWSVA services.

    # /etc/iscan/rcIwss stop

    Note: This will interrupt the network traffic for a few minutes so plan accordingly.

  2. Use vi to edit the file /etc/iscan/intscan.ini:

    #vi /etc/iscan/S99ISproxy
  3. Change the following setting in [Scan-configuration] section.

    ----------------------------------   tmpdir=/etc/iscan/tmp/v_tmpfs  ---------------------------------- 

    To make IWSVA use the hard drive directory:

    ----------------------------------  tmpdir=/etc/iscan/tmp  ---------------------------------- 
     
    Note: There are many parameters named "tmpdir". Please make sure to change the one under [Scan-configuration].
  4. Save the file and quit.
  5. Start all of the IWSVA services.

    # /etc/iscan/rcIwss start

Miscellaneous:

The insufficient space in /etc/iscan/tmp/v_tmpfs also leads to the block of compressed files with a  "Failed_Extract_File" scan result. The aforementioned settings are workarounds for the block.

You can also change how IWSVA treats "Failed_Extract_File" scan result.

For more details, refer to the KB article: Non-malware files are unexpectedly blocked in InterScan Web Security Virtual Appliance (IWSVA) 6.5 Service Pack 2.

Premium
Internal
Rating:
Category:
Configure
Solution Id:
1121552
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