Category: storage / NAS / QNAP

long story short: “The Year 2038 problem is where the Unix time can no longer be stored in a signed 32-bit integer and thus after 19 January 2038 will begin wrapping around as a negative number for representing the number […]

this is a very very basic sequential harddisk write test performed on host and guest. there are multiple ways, how you could improve the performance: Use fixed size disks Allocate RAM and CPUs wisely Install the Guest Additions enable host […]

the itsec troubles: CPU Intel Celeron Processor J Series is Spectre & Meltdown affected (src) while Spectre & Meltdown based hack was observed in the wild, going with RISC-V SoC or AMD based SoC (CPUs & Mainboards) might be the […]

kernel 3.10, software raid1 works fine… kernel 4.18, software raid1 seems to work fine… kernel 4.19, software raid1 miserably fails… it starts to sync raid1 discs becomes slower and slower and finally “120 seconds….” then comes to a halt. i […]

update: 2019-02: everything was fine… until you decided to update because of the EthernalBlue exploit THAT ALSO AFFECTS OPEN SOURCE IMPLEMENTATIONS OF SMB 1.0! (WTF!? WHY?), samba now miss behaves on Debian and CentOS. (scroll down for details) EternalBlue, sometimes […]

You might want to checkout very basic sequential write/read benchmark with dd. You might also want to checkout: cross os harddisk benchmark iozone and java. ============ OS and Kernel Linux server4.localdomain 4.15.7 #1 SMP Sun Mar 4 16:43:40 CET 2018 […]

REM delete all mapped network drives net use * /DELETE /Y REM map two drives net use W: “\\192.168.0.233\SharedFolderA” /persistent:yes /user:usernameA PaSsWorDA net use T: “\\192.168.0.231\SharedFolderB” /persistent:yes /user:usernameB PaSsWorDB what you need to know: windows CAN NOT establish two connects […]

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 3.0 […]

While the Supermicro X8DT3 CPU: 2x Xeons with 2x Intel Xeon(R) CPU E5504 @ 2.00GHz and RAM: 64GB RAM EEC Dual-Powersupply is a great mainboard with java remote web IPMI console that allows you to access the bios and remote […]

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 […]

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 […]

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 […]

checkout the tutorial: http://jperrin.org/centos/monitoring/grafana/keeping-an-eye-on-centos-performance-with-grafana/ maybe cacti and co is too complicated and looks a little outdated… collectd might be just what you are looking for 🙂 “The main objective of this is to develop an easy to use and customizable […]

The Enterprise Volume Management System (EVMS) Project has the goal of providing unparalleled flexibility and extensibility in managing storage. It represents a new approach to logical volume management for Linux. The architecture introduces a plug-in model that allows for easy […]

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 […]

smart and ssds? and: is smart really that smart? to do regular smart, is better than doing no smart, but as confirmed here, it can be only minutes of time from reporting an error-problem to complete harddisk failure, so smart […]

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: […]

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) […]

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 […]

iSCSI it is possible to tunnel SCSI through TCP/IP – allowing adding ressources of storage-servers directly – as if it was a local harddisk or partition. The isci-initiator (client) can “partition-and-format-over-network” the iscis-target (harddisks or files acting as aprtitions on […]

The good news is: It supports OSX and Linux now. Windows & Linux Servers Microsoft Exchange, Microsoft SQL, SharePoint & Active Directory Microsoft Azure & Amazon EC2 cloud workloads Adding a machine running Windows Adding a machine running Linux Adding […]

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. […]

there is an confusing amount of programs under linux that can do partitions – it is not really clear – when you need what or if you need them at all. this article should get you some info if you […]

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) uname -a; # tested with Linux debian 3.16.0-4-686-pae #1 SMP […]

yeah one knows sometimes making fun of distributions that have a partition for every /root/folder but well yes it has it’s reasons, like when a program accumulates to much data (mailbox full), the /root partition and the system will not […]

the commands used for xfs are different. this is only valid for ext3/ext4. preparation: you should move your /home to a separate partition. Warning! You will need to have “physical” access to the server’s console in order to perform these […]

“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 […]

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 3.0 […]

this is a crowd-funding project that still needs funding…. if you can help! please chip in 🙂 https://www.crowdsupply.com/gnubee/personal-cloud-1 Tour of LibreCMC and openmediavault We took a screencast of LibreCMC and some screenshots of openmediavault running on the GnuBee Personal Cloud […]

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 […]