Category: storage / NAS / QNAP

unit of data storage – byte kilobyte megabyte gigabyte terabyte petabyte exabyte zettabyte yottabyte nonabyte doggabyte kibibyte mebibyte gibibyte tebibyte pebibyte exbibyte zebibyte yobibyte nobibyte dogbibyte
12.01.2021

Byte The term byte was coined by Werner Buchholz in June 1956,[4][13][14][b] during the early design phase for the IBM Stretch[15][16][1][13][14][17][18] computer, http://archive.computerhistory.org/resources/text/IBM/Stretch/pdfs/Buchholz_102636426.pdf backup mirror: PLANNING A COMPUTER SYSTEM BROJECT STRETCH Buchholz Campbell_102636426.pdf which had addressing to the bit and […]

10.01.2020

mdadm -E /dev/sd[a-z] # -E, –examine # Print contents of the metadata stored on the named device(s). # Note the contrast between –examine and –detail. # –examine applies to devices which are components of an array, while # –detail applies […]

how to change uuid of logical lvm partitions
16.07.2019

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 […]

Samba4 on CentOS7 in under 10min – add windows file sharing user script – security – from SMB 1.0 to 2.0 – anti ETERNALBLUE EXPLOIT update trouble – SID “username” is not in a valid format – pdb_getsampwnam (tdb) error fetching database – solved
19.04.2018

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 […]

31.01.2018

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 […]

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 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)
04.08.2017

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 […]