resize2fs: Bad magic number in super-block;

On Centos 7.0, you are trying to resize using “resize2fs2 the new logical volume once you have add a new volume to your group;

this error:


[root@centos7 ~]# resize2fs "yourvolumegroup"
resize2fs 1.42.9 (28-Dec-2013)
resize2fs: Bad magic number in super-block while trying to open "yourvolumegroup"
Couldn't find valid filesystem superblock.

On Centos 7.x, its using now XFS (look into the /etc/fstab), default should be xfs.

Instead of using resize2fs, use this command:

xfs_growfs "yourvolumegroup"

Add Anti Spam As Brightmail on your NAS Synology

As for some Mid and small company, Synology that integrate DSM allows to install/implement a mail server and others… 🙂

The Mail server is based on Postfix, one of the most common Mail server as an alternative to sendmail.(

As spam is everywhere, you might consider to implement some solution as Brightmail instead of the spam assassin which is indeed also part of the available package from DSM.

To do so, add these lines to your from Postfix:

smtpd_milters = inet:IP:41001
milter_protocol = 2
milter_default_action = accept

IP: is the IP of the machine that have Brightmail software.

On Synology, the file is located to:


You might also wish to implement the change into the template file, as if some postfix update are applied this settings might be overwritten.





Have fun.



VMWare Workstation 10 under CentOS 6.x failed to start Virtual machine monitor

I have experienced recently some issue while attempting to start vmware machines on Centos OS. (6.6).

When I start the vmware services, (service vmware start) the Virtual machine monitor states as FAILED.

Attending to start a vmware, this error appears:

Could not open /dev/vmmon: No such file or directory.
Please make sure that the kernel module `vmmon' is loaded.

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