Monday, December 8, 2025

The definitive encrypted (MD crypt) Linux MD RAID 5 guide for archival over HDDs

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Following this guide you'll be able to create and do various operations (like add a new disk, replace a disk, do recovery etc...) on a h...
Wednesday, August 13, 2025

Gentoo x86_64/amd64 on x86_64/amd64 crossdev guide.

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You got an underpowered amd64 machine on which you want to install Gentoo. But instead of waiting for it for days to compile libreoffice or ...
Monday, August 11, 2025

Gentoo benchmarks with vs without avx512(-mno-avx512)

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So I had to migrate my crossdev setup which I was using to maintain my laptop to a chroot-maintained setup on my non-avx512 capable workstat...
Tuesday, August 5, 2025

Integrating sccache-dist in portage/gentoo for rust distributed compiling.

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 NOTE: it did not work out. The (remote) sccache-dist server error out with --  Missing output path "/tmp/portage/www-client/firefox-12...
Thursday, June 19, 2025

Impact of mdadm -c, --chunk on random read/write performance and disk space utilization.

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No one knows exactly what this is in context of mdadm, but this must be the minimum i/o size of the RAID block device. Regardless, I did som...
Tuesday, June 10, 2025

mdadm (RAID 5) performance under different parity layouts (-p --parity --layout)

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While performance of right-asymmetric, left-asymmetric, right-symmetric, left-symmetric, is roughly the same, the performance of parity-last...
Wednesday, May 28, 2025

Re-writing HDDs to avoid bitrot/degradation under linux.

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Over the years your archival HDDs are susceptible to bitrot. You've to re-write them on regular intervals to prevent that. You can use d...
Tuesday, April 29, 2025

ffmpeg: Audio/video out of sync in ffmpeg when frame rate limit is set using -r.

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 If you've specified -r at the input, you may like to try moving it before the -vcodec to resolve the issue. With this change, the input...

Ext4 vs xfs (with and without rmapbt) massive small file operations benchmark

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 Methodology /mnt/tmpfs/ contains trimmed linux sources. Large files where removed to reduce the size of the total storage to 5GB. /mnt/tmpf...
Monday, April 28, 2025

Debian trixie vs Gentoo benchmark.

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Recently I came across this benchmark, which although old, but laughable (if you don't know why, I suggest you either readup more about...
Thursday, April 10, 2025

Debian trixie source.list (with unstable and experimental added) and corresponding apt pin configuration.

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 This is the /etc/apt/source.list --  deb http://deb.debian.org/debian/ testing main contrib non-free non-free-firmware deb-src http://deb.d...