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file system

Linux Reclaim Storage Space - Ext4 Unmap Feature

Its been long time reclaiming space on a block level storage , been alerting and frustrating for all who work on storage side. Block storage only knows about areas of a volume that have ever been written . If later the application frees up space / delete files , the space is not marked

How to access gvfs mounts from command line?

It is in /run/user/<uid>/gvfs instead of /run/user/<username/login>/gvfs. Please note that: <uid> is user id = number while <username/login> is a string, human readable user name Where one to the other is mapped through /etc/passwd

How to make modules xfs.ko in RedHat/Centos Linux

First, follow up the page link http://wiki.centos.org/HowTos/BuildingKernelModules to understand basically kernel source make knowledge. Example Commands. #cd ~/rpmbuild/BUILD/kernel-2.6.18/linux-2.6.18.i686 #cp /boot/config-2.6.32-504.16.2.el6.i686 .config #cp /usr/src/kernel/`uname -r`/Makefile . #make menuconfig

Fast Way to Randomize HD?

You can get OpenSSL to encrypt /dev/zero with a randomized password, giving decent pseudorandom data very fast (if your CPU supports accelerating it). openssl enc -aes-256-ctr -pass pass:"$(dd if=/dev/urandom bs=128 count=1 2>/dev/null | base64)" -nosalt </dev/zero | dd of=

Linux define snmp trap add the trap destination

On the Linux® operating system, administrators should open the file /etc/snmp/snmpd.conf and add this entry: trapsink ip_address community_name. To restart the SNMP service, enter service snmpd restart. vi /etc/init.d/snmptrapd OPTIONS="-A -Lfd -p /var/run/snmptrapd.pid" vi /etc/snmp/

Ubuntu support exFAT support

https://code.google.com/p/exfat/ Installation of ExFat process, open Terminal and enter commands: sudo add-apt-repository ppa:relan/exfat sudo apt-get update sudo apt-get install fuse fuse-exfat exfat-utils