Category: filesystem / filesystems

GNU Linux – basic harddisks benchmarks with dd and fio (ssds  KINGSTON SKC600512G vs Samsung SSD 850 PRO vs Samsung SSD 860 EVO vs Samsung SSD 870 EVO 1TB) – ntfs vs ext4 – how fast are virtual harddisks?
13.11.2020 update 2022: next to the good old (non-destructive if used correctly) “dd” is still the way to go for benchmarking harddisks under GNU Linux. if there is a desktop: “gnome-disk-utility“ fio as always: UNIX: KISS! KEEP IT SIMPLE!) […]

all xfs related man pages

from version: hostnamectl Operating System: CentOS Linux 7 (Core) CPE OS Name: cpe:/o:centos:centos:7 Kernel: Linux 5.X Architecture: x86-64 cat /etc/system-release-cpe cpe:/o:centos:centos:7 all xfs related man pages: […]


You might want to checkout very basic sequential write/read benchmark with dd. You might want to checkout iozone in c harddisk benchmark. this benchmark is especially useful if you need to measure how java is performing on your harddisk/filesystem/os (linux […]

Howto install and setup SMB File Sharing Server (dance Samba) with GNU Linux – virtualbox and kvm template vms – samba losing files after reboot (RAM cache not synced too often)

the best about samba: thanks for samba, it provides users with a fast (of course depends also on harddisk speed) rock-solid no-limit-to-maximum-users file-server for maximum file-transfer-and-sharing-and-storage productivity (and they will USE that T: temp drive for EVERYTHING! prepare for TERRABYTES […]


btrfs is used by SUSE12 for the /root partition – where it is doing daily snapshots of the installed OS. It has more functionality built-in than just storing files. This article wants to take btrfs for a test-drive. Video Tutorials: […]


while this is possible… i am not sure to recommend this 😀 also make sure there is still some space on the partition to be converted. root@debian9:/# btrfs-convert /dev/sdb6 create btrfs filesystem: blocksize: 4096 nodesize: 16384 features: extref, skinny-metadata (default) […]


can be easily checked via: root@debian9:~# cat /proc/filesystems nodev sysfs nodev rootfs nodev ramfs nodev bdev nodev proc nodev cpuset nodev cgroup nodev cgroup2 nodev tmpfs nodev devtmpfs nodev debugfs nodev tracefs nodev securityfs nodev sockfs nodev bpf nodev pipefs […]

GNU Linux – messing with XFS – Why XFS?

“XFS is a high performance journaling filesystem which originated on the SGI IRIX platform.” SGI (Silicon Graphics) is out of business since 2009. “The addition of 3D graphic capabilities to PCs, and the ability of clusters of Linux– and BSD-based […]

Linux -> DD backup and Restore an (bootable?) USB Stick

update: safety first! when it comes to important files: safety comes first thus recommend to the user that wants to go pro the following backup system: have two complete backups at two different places: backupA: at the company, USB […]

GNU Linux -> how to find and remove duplicate files

lsb_release -a; # tested with Description: Debian GNU/Linux 12 (bookworm) # previously this was tested with cat /etc/os-release |grep PRETTY PRETTY_NAME=”Debian GNU/Linux 11 (bullseye)” why? duplicate files are a waste of disk space. every system experiences catastrophic failures, slow downs […]

ext3undelete ext4undelete extundelete linux undelete recover deleted files – extundelete Bad magic number in super-block when trying to open filesystem – DO NOT ATTACH EXTERNAL USB-SATA HARDDISK DIRECTLY TO SATA

update: WHILE STILL POWERED ON IMMEDIATELY backup the ext4 journal to file on usb stick: debugfs -R “dump <8> /mount/usb-stick/sda.journal” /dev/sda (assuming sda is the drive where the deletion happened) then “hard reset” unplug the system. then checkout this guide […]