Hello, We encountered a problem with performance of writes on GPFS when the application uses direct io access. To simulate the issue it is enough to run fio with option direct=1. The performance drop is quite dramatic - 250 MiB/s vs. 2955 MiB/s. We've tried to instruct GPFS to ignore direct IO by using "disableDIO=yes". The directive didn't have any effect. Is there any possibility how to achieve that GPFS would ignore direct IO requests and use caching for everything? -- S přáním pěkného dne / Best regards Mgr. Peter Hruška IT specialista M Computers s.r.o. Úlehlova 3100/10, 628 00 Brno-Líšeň (mapa<https://mapy.cz/s/gafufehufe>) T:+420 515 538 136 E: peter.hruska at mcomputers.cz<mailto:peter.hruska at mcomputers.cz> www.mcomputers.cz<http://www.mcomputers.cz/> www.lenovoshop.cz<http://www.lenovoshop.cz/> [cid:0e66df54ea6e2d2372ddf5fb3417f35a416a893f.camel at mcomputers.cz-0] -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://gpfsug.org/pipermail/gpfsug-discuss_gpfsug.org/attachments/20240311/e5cfd6b3/attachment.html> -------------- next part -------------- A non-text attachment was scrubbed... Name: mcomputers_podpis_2024.png Type: image/png Size: 13955 bytes Desc: mcomputers_podpis_2024.png URL: <http://gpfsug.org/pipermail/gpfsug-discuss_gpfsug.org/attachments/20240311/e5cfd6b3/attachment.png>
