Category: filesystem / filesystems

LibreBoot – (how to mount luks2 encrypted volume) LVM encrypted volumes needs correct CMOS clock time – Volume Group not found – failed to read int token error parsing metadata
03.12.2020

to recover the data: how to mount luks2 encrypted volume possibility: remove harddisk, attach to sata2usb adapter, then mount on different machine like this: # unlock encrypted harddisk udisksctl unlock -b /dev/sdb5 udisksctl mount -b /dev/mapper/ubuntu–vg-root Mounted /dev/dm-1 at /media/dpm/e8cf82c0-f0a3-41b3-ab28-1f9d23fcfa72 […]

all xfs related man pages
16.07.2019

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: https://dwaves.de/man/xfs_admin.man.txt https://dwaves.de/man/xfs_io.man.txt https://dwaves.de/man/xfs_bmap.man.txt https://dwaves.de/man/xfs_logprint.man.txt https://dwaves.de/man/xfs_copy.man.txt https://dwaves.de/man/xfs_mdrestore.man.txt https://dwaves.de/man/xfs_db.man.txt https://dwaves.de/man/xfs_metadump.man.txt https://dwaves.de/man/xfs_estimate.man.txt https://dwaves.de/man/xfs_mkfile.man.txt https://dwaves.de/man/xfs_freeze.man.txt https://dwaves.de/man/xfs_ncheck.man.txt https://dwaves.de/man/xfs_fsr.man.txt https://dwaves.de/man/xfs_quota.man.txt […]

The Y2038 Problem – cars and embedded systems
23.01.2019

in comparison to Y2K: “The issue became when it became 2000 because that would be stored as 00 in the program. This caused many to believe that say, bank software wouldn’t be able to get your money out because it […]

19.12.2017

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 File Sharing Server with GNU Linux
04.08.2017

ext3+gnu_linux+samba = fast and reliable fileserver. WARNING! Security problems Versions from Version 3.5.0 to 4.6.4 (recent in May 2017 ) are affected and need to be patched! patches are available from: https://www.samba.org/samba/patches/ Unfortunately EVEN Debian9 (!!!! GUYS FIX THAT FAST […]

07.07.2017

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: […]

07.07.2017

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) […]

GNU Linux – recover deleted files NTFS – undelete ext3 vs ext4 – rescue accidentally deleted data files – overwritten partition table – foremost – gpart
06.07.2017

update: extundelete works well on ext3 but kind of failed me on ext4. tools to try: http://trinityhome.org/Home/index.php?wpid=61&front_id=12 get an overview: what harddisk/partition is what? lsblk; # more detailed lsblk -o “NAME,MAJ:MIN,RM,SIZE,RO,FSTYPE,MOUNTPOINT,UUID” alias harddisk=’lsblk -o “NAME,MAJ:MIN,RM,SIZE,RO,FSTYPE,MOUNTPOINT,UUID”‘ harddisk NAME MAJ:MIN RM SIZE […]

06.07.2017

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 […]

15.05.2017

“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
23.07.2015

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: https://www.ebay.de/itm/Intenso-Memory-Board-4-TB-Externe-Festplatte-8-9-cm-3-5-Zoll-USB-3-2-Gen-1/402584943201 have two complete backups at two different places: backupA: at the company, USB […]