wiki.niziak.spox.org

performance

niziak (niziak@undisclosed.example.com) — 2026-11-11T20:14:30+00:00

performance pbs datastore tunning Overview of PBS Sync Levels * filesystem (Default): Triggers syncfs(2) across the entire filesystem right after a backup finishes. It balances strong crash-resistance with performance. * file: Triggers an fsync(0) on every individual chunk insertion. It provides the

Uni-t UTi260B

niziak (niziak@undisclosed.example.com) — 2026-11-10T09:54:44+00:00

Uni-t UTi260B Thermal Imaging Camera Device information: UTi260B Version: V1.2.28 * * * *

agents - created

niziak (niziak@undisclosed.example.com) — 2026-11-03T11:06:30+00:00

agents cheaper explore agent --- name: Explore description: Read-only search agent for broad fan-out searches — when answering means sweeping many files, directories, or naming conventions and you only need the conclusion, not the file dumps. It reads excerpts rather than whole files, so it locates code; it doesn't review or audit it. Specify search breadth: "medium" for moderate exploration, "very thorough" for multiple locations and naming conventions. model: haiku disallowedTools: Agent, E…

Claude skills - created

niziak (niziak@undisclosed.example.com) — 2026-11-03T11:04:33+00:00

Claude skills Built-in skills Skill Description dataviz Builds charts and data visualizations from supplied data artifact-diagramming Creates diagrams (flows, architecture) as artifacts keybindings-help Explains and customizes keyboard shortcuts

Disaster recovery - [Replace rpool device]

niziak (niziak@undisclosed.example.com) — 2026-11-02T10:32:41+00:00

Disaster recovery replace NVM device Only 1 NVM slot available, so idea is to copy nvm to hdd and then restore it on new nvm device. Stop CEPH: systemctl stop ceph.target systemctl stop ceph-osd.target systemctl stop ceph-mgr.target systemctl stop ceph-mon.target systemctl stop ceph-mds.target systemctl stop ceph-crash.service

gc - ↷ Links adapted because of a move operation

Anonymous (anonymous@undisclosed.example.com) — 2026-10-29T07:49:27+00:00

gc GC is divded into 2 phases: * GC phase1 (mark used chunks), where all backups are traversed and each used chunk is “touched” to update atime. * GC phase2 (sweep unused chunks), where all unused (not recently atime-d) are removed. atime cutoff

- ↷ Page moved from vm:proxmox:pbs:issues:pbs:gc to vm:proxmox:pbs:issues:gc

niziak (niziak@undisclosed.example.com) — 2026-10-29T07:49:26+00:00

swapping when pleny of free of ram - created

niziak (niziak@undisclosed.example.com) — 2026-10-28T20:16:21+00:00

swapping when pleny of free of ram https://github.com/openzfs/zfs/issues/18893 Host swapping burst observed when ZFS ARC cache grows. Scenario: * spl_cache_grow_work → __vmalloc → alloc_pages, and it asks for an order-10 allocation, a 4 MiB contiguous block, with GFP_ATOMIC. That is ZFS (the SPL layer) growing one of its slab caches.

source

niziak (niziak@undisclosed.example.com) — 2026-10-26T18:23:57+00:00

source Possible test scenario: * call from another directory by full path /home/user/bin/myscripth.sh * add /home/user/bin to PATH and then call from another directory by myscript.sh * create symlink to script and call using symlink. Check for relative and absolute symlinks.

Midnight Commander

niziak (niziak@undisclosed.example.com) — 2026-10-26T07:42:34+00:00

Midnight Commander CTRL + ENTER over SSH CTRL+ENTER CTRL+SHIFT+ENTER If CTRL key is not passed over SSH Possible issues: * /root/.bashrc has alias mc='mc -X'. The mc man page says -X, --no-x11 means “Do not use X11 to get the state of modifiers Alt, Ctrl, Shift

performance

niziak (niziak@undisclosed.example.com) — 2026-10-23T10:17:58+00:00

performance memcached Tune cache size in /etc/memcached.conf to get zero evictions (wait few days from memcached restart): echo stats | nc -q1 127.0.0.1 11211 | grep -E "limit_maxbytes|evictions" jemalloc apt install libjemalloc2 mkdir /etc/systemd/system/openproject-web-1.service.d mkdir /etc/systemd/system/openproject-worker-1.service.d cat - >/etc/systemd/system/openproject-worker-1.service.d/jemalloc.conf <

Firefox

niziak (niziak@undisclosed.example.com) — 2026-10-22T08:54:19+00:00

Firefox certificate problem, but option to accept anyway has gone “accept certificate” “self-signed certificate” * about:config * browser.xul.error_pages.expert_bad_cert to true * security.certerrors.permanentOverride to true Disable Detachable Tabs in Mozilla Firefox

CEPH inline compression

niziak (niziak@undisclosed.example.com) — 2026-10-21T11:07:43+00:00

CEPH inline compression BlueStore compression performance get compression ratio ceph df detail --- POOLS --- POOL ID PGS STORED (DATA) (OMAP) OBJECTS USED (DATA) (OMAP) %USED MAX AVAIL QUOTA OBJECTS QUOTA BYTES DIRTY USED COMPR UNDER COMPR rbd 1 512 2.3 TiB 2.3 TiB 15 KiB 638.96k 6.4 TiB 6.4 TiB 44 KiB 59.17 1.5 TiB N/A …

Move DB to bigger storage

niziak (niziak@undisclosed.example.com) — 2026-10-21T09:23:31+00:00

Move DB to bigger storage I.e: to move from 4GB partition to 30GB partition in case of spillover: 1 OSD(s) experiencing BlueFS spillover osd.3 spilled over 985 MiB metadata from 'db' device (3.8 GiB used of 4.0 GiB) to slow device lvdisplay --- Logical volume --- LV Path /dev/ceph-66ad9fa6-0f65-4fc0-baeb-41089a509347/osd-block-4a9e142e-ed4d-4890-a018-5651c36071a5 LV Name osd-block-4a9e142e-ed4d-4890-a018-5651c36071a5 --- Logical volume --- LV Path…

20260824-110902.png - created

niziak (niziak@undisclosed.example.com) — 2026-08-24T09:09:02+00:00

dokuwiki-128.png - created - external edit

Anonymous (anonymous@undisclosed.example.com) — 2026-07-22T15:56:02+00:00

20260720-103516.png - created

niziak (niziak@undisclosed.example.com) — 2026-07-20T08:35:16+00:00

20260608-205111.png - created

niziak (niziak@undisclosed.example.com) — 2026-06-08T18:51:11+00:00

20260520-124857.png - created

niziak (niziak@undisclosed.example.com) — 2026-05-20T10:48:57+00:00

20260520-124158.png - created

niziak (niziak@undisclosed.example.com) — 2026-05-20T10:41:58+00:00