Author Archives: Kaven Gagnon

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About Kaven Gagnon

System & Network Architect

Linux : R1Soft hcp module error : Could not init mrf hash!

R1Soft backup may fail in some circumstances, even though no change occurred, the agent and kernel hcp module properly installed with message that the replication driver was not detected as shown below :

Looking at the protected machine system logs, we can observe a “call trace”, memory related entries and the following regarding the… Read More »

Thank you!

Precisely 10 years ago, this site was born! Special thanks to all visitors and supporters. Stay safe and healthy. K.

Web : ImagickException: attempt to perform an operation not allowed by the security policy `PDF’

After updating ImageMagick to version 6.9.10.23+ from an earlier version, the following behavior occur : Thumbnails generation from PDF, XPS, PS, and EPS does not work anymore The following output can be found in the Web server error log :

This is due to the addition of a policy in the newer version that… Read More »

Linux : How to show Apache memory usage and average process size

Here is an easy way to output in a single command the Apache memory usage and average process size :

This is particularly useful when you need to calculate proper process, max clients, etc. settings.

Linux : sar command return “Cannot open /var/log/sysstat/sa27: No such file or directory”

Attempting to use the SAR (sadc) command to lookup the historical system resources consumption metrics and got the following message? Cannot open /var/log/sysstat/sa27: No such file or directory Please check if data collecting is enabled Most likely data collecting is disabled (it is the default on several systems). You need to enable data collecting and… Read More »

Linux : Issue with mail aliases “database /etc/aliases.db is older than source file /etc/aliases”

If you are experiencing issues with your local mail aliases, make sure there is no syntax error in /etc/aliases file and have a look at the mail log file :

You most likely will encounter a message like this one :

In that case, simply run the command to rebuild the aliases database… Read More »

Linux : phpMyAdmin – Error Incorrect format parameter

Having the following error while importing a MySQL dump? phpMyAdmin – Error Incorrect format parameter Have a look at the “upload_max_filesize” value in your “php.ini” parameters. Most of the time, the dump file you are trying to import exceed that limit. Increase the value as needed.

Windows : Unable to merge cells within a table in Microsoft Excel

If you attempted to merge cells together within a table in Microsoft Excel, you may have faced the grayed out “Merge and Center” button issue. To work around this problem, do the following : 1. Select the cells that you want to merge 2. Right click on the selection 3. In the context menu, click… Read More »

Category: PC