out of space? howto upgrade and grow lvm2 luks encrypted root home harddisk the process is like this: lvm2 can use a new empty partition or even harddisk to extend an existing logical volume group and logical volumes inside those […]
“to swap, or not to swap, that is the question”: definitely swap more! Shakespeare! “to encrypt, or not to encrypt” (if it contains valuable data: DEFINITELY ENCRYPT!!!) (general tutorial about lvm (logical volume management) “to lvm, or not to lvm” […]
lvm2 concept: tested on: debian 8-9 and compatible, manpages from centos7/rhel7 in general backup! backup! backup! before fiddeling with partitions and the filesystem… logical volumes basically allow you to span partitions over several disks/partitions as well as resize those partitions. […]
tape: is it worth the hazzle? what is better (+ cheaper +faster +easier): 1PetaByte of tape or 1PetaByte of harddisk storage server? the race is on! that’s what it might look from the inside: a lot of dirt and dust […]
ZFS is probably THE most controversial filesytem in the known universe: “FOSS means that effort is shared across organizations and lowers maintenance costs significantly” (src: comment by JohnFOSS on itsfoss.com) “Mathematicians have a term for this. When you rearrange the […]
first off the praise: kvm-qemu is a high performance nicely scriptable virtualization system if it works, it can do pretty things 🙂 IN CONTRAST TO iESXI SH** WARE CLONING A VM IS A EASY AS: virt-clone –original debian12 –name debian12-clone […]
harddisk encryption is important from critical data to get physically stolen (can’t do much about data that get’s stolen while DEcrypted) (except: to not have any physical network connection while the data is in DEcrypted state?) hostnamectl; # tested on […]
this was a very nasty problem that has cost me some time the hardware was perfectly fine… but somehow an employee managed to kill the /boot partition (improper shutdown? what the user then ends up with is the grub2 prompt: […]
details on the latest SanDisk Ultra 3.2Gen1 32GBytes stick Why this stick and not 1:1 dd copy a Debian (or other) Live iso on the stick? (Debian even provides Live.iso with a bunch of different desktops to chose from #NOICE!) […]
Pure Beauty: “the glow” “IT JUST WORKS” 🙂 wifi works two-finger-scroll touchpad works sound works (hey! startup sounds are important 🙂 admitted: the keyboard will need some time of getting used to X-D (per default Macbook Pro A1278 would run […]
to recover the data: how to mount luks2 encrypted volume also check out alternative: GNU Linux – create new encrypted partition harddisk – how to open encrypted harddisk partition possibility: remove harddisk, attach to sata2usb adapter, then mount on different […]
https://wiki.archlinux.org/title/benchmarking update 2025: very basic cross os distribution monitor harddisk speeds bash script by counting sector read write update 2022: next to the good old (non-destructive if used correctly) “dd” is still the way to go for benchmarking harddisks under […]
first some praise: the maintainers of grub did their best they could to bring about a great piece of software, no doubt about that. the question is: could less be more? when Greg Kroah-Hartman suggested to get rid of the […]
problem: manually changing uuids is tidious and might not yield the result you want. unfortunately have not succeeded yet with integrating an old harddisk.vdi (same uuids) back into the template vm (same uuids) – so the recommendation is: reinstall os […]
for good overview it makes sense to label the harddisk partitions according to functionality (what is their purpose?) GNU Linux bash – how to label partitions tune2fs (xfs & ext4) # where is what & updates over changes (usb disk […]
Linux is pretty hardware independent, so most of the time you can just 1:1 clone/move harddisk to new machine and in 99% of cases it will just boot. make sure – target (new) machine’s harddisk is same or bigger size […]
yes ext3 is old – but it works and you can undelete files – which can come in handy – because nobody is perfect – except god – and nobody should assume he/she is god. it supports filesystems up to […]
you should setup harddisk encryption during setup. to add an encrypted /home partition afterwards might be possible but a lot more effort. scroll very down if you want to know how to encrypt an usb sticks … needless to say […]
update: extundelete works well on ext3 but not on ext4. 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) […]
update: 2021-1 yum -> dnf hostnamectl; # tested on Virtualization: kvm Operating System: CentOS Linux 8 CPE OS Name: cpe:/o:centos:centos:8 Kernel: Linux 5.4.11 Architecture: x86-64 ll /usr/bin/yum -> dnf-3 all those yum commands still work with dnf (nice work!) DNF […]
here he is Mr Poettering in 2014 explaining systemd and why it ought to be soooo complex. with all decision making, it should be rational and fact and reason based and then stick to it (aka systemA boots faster than […]
tested with: ext3 and ext4 (does not work for xfs) MY RECOMMENDATION: WHO CARES IF THE NAS IS DOING A AUTOMATIC REBOOT AT SUNDAY 3 o’CLOCK IN THE MORNING AND CHECKING 2-3TB OF EXT3 FILESYSTEM? NO ONE! RELIABILITY SHOULD BE […]
tested on: Linux debian7 3.2.0-4-amd64 #1 SMP Debian 3.2.46-1+deb7u1 x86_64 GNU/Linux here an example how aptitude can resolve a problem that apt can’t resolve (easily). how to solve the problem: #!/bin/bash # the problem: dpkg: dependency problems prevent configuration of […]
update: safety first! when it comes to important files: safety comes first while xfs is surely doing a great and fast job, test if undelete utilities work now for ext4, if yes, go for ext4 (having experienced some problems with […]
one lucky day i got prompted “enter root passwort” or Control+D to continue. (not recommended) … the root filsystem reported UNEXPECTED INCONSISTENCIES. so you go fsck -y /dev/sda you see that your disk makes errors when you check less /var/log/kern.log THAN […]
beautiful software “it just works” This is one’s Open Source knowledge base. If one had to explain – what is the difference between Open Source and Closed Source software – one would say – Open Source software is (usually) made […]