.pQd

Ideas: rsync-like tool parallelizing transfer of large files

by .pQd
i use rsync heavily for backups, batch jobs and one-off tasks. every day it moves around terabytes of data for me. while it’s great – saves time and bandwidth, it could make even better use of modern hardware – multicore, and often with plenty of unused storage IOps: one day, when i’ll have some spare ... Read More

splitting ebook in one mp3 into multiple files

by .pQd
my daughter likes to listen to audiobooks; some of them come from youtube, some are multi-hour long. it’s easier to listen, re-listen if book is chopped into shorter chapter-alike files. how do i do it? yt-dlp is a swiss army knife for downloading audio/video from multiple hosting services mp3splt allows to split mp3 files in ... Read More

Hong Kong, again

by .pQd
i got yet another chance to travel to Hong Kong. i’ve spent there 9 days in October this year. what did change since my previous visit in 2018? what did not change: few places that i’ve hiked around for the first time: Lamma Island – i got there with a ferry from Central. concrete path ... Read More

beko dishwasher showing e01 code

by .pQd
our dishwasher stopped working, displayed E01 code and whenever closed was running drain pump all the time. i’ve called their support and learned it’s a known anti-flood feature and is caused by water that leaked gradually out of dishwasher and stayed in its base. solution? makes you wonder why does the water leak out of ... Read More

random things that inspire me

by .pQd
SQLite’s code of ethics: https://www.sqlite.org/codeofethics.html altamira’s ten investment commandments

New supermicro server does not ‘see’ some of NVMe drives

by .pQd
i got 3 identical new servers from supermicro – SYS-121C-TN10R. all three have the same disk setup – 2+4 NVMe drives, but Debian 12 just see 5 of them instead of 6. when i run dmesg on newly installed system i can see those errors: to solve it i had to change PCIe bifurcation in ... Read More

charging Amazfit Band 5

by .pQd
i’m a happy user of Amazfit Band 5. it’s dirt cheap, paired with gadgetbridge – works fine without sharing any data with cloud-hosted big brother, all in all – it helps to keep me moving around each day. i had few occasions when i needed to charge it [ every ~2 weeks ] and did ... Read More

Fastly returning “Requested host does not match any Subject Alternative Names (SANs) on TLS certificate”, HTTP/421

by .pQd
due to $reasons we have an nginx-proxy that is a reverse proxy forwarding to Fastly CDN which, in turn, forwards back to our infrastructure. starting from the 2024-02-27 this stopped working, for some HTTP queries. most notably those using OPTION verb. response that nginx was getting from Fastly had HTTP/421 status code and payload: colleague ... Read More

Ohook – activating MS office

by .pQd
this might be useful, especially for environments where automated tests of MS-office-dependent applications are done: https://massgrave.dev/ohook.html + https://github.com/asdcorp/ohook

parallel rsync

by .pQd
rsync remains my main tool for transferring backups or just moving data between servers. but it has some pain points – e.g. rsync’s checksum calculation or ssh over which data is piped can easily saturate single CPU core before i run out of storage I/O or network bandwidth. how to parallelize it – based on ... Read More

resources for learning SQL

by .pQd
SQL basics: indexes: https://use-the-index-luke.com/ ‘modern’ SQL: fiddles – web-based sandboxes:

bug in postgresql’s GIN index

by .pQd
it’s a story without happy end. i’m absolutely sure there’s an index-corruption bug in PostgreSQL 13; since i have not seen any mention of it being fixed – it’s likely in the following releases as well. i’ve tried to get attention to it on the pgsql-bugs mailing list but i failed. likely because i’ve never ... Read More