Month: December 2021

Enable blk_mq on Redhat (OEL/Centos) 7 and 8

Byetzion 18/12/202127/01/2023

The IO scheduler blk_mq was designed to increase disk performance – better IOps and lower latency – on flash disk systems, with emphasis on NVME devices. A nice by-product, is that it increases performance on the “older” SCSI/SAS/SATA layer as well, when the disks in the back are SSD, and even when they are rotational…

Disk Storage | Linux

Reduce traverse time of large directory trees on Linux

Byetzion 14/12/202127/01/2023

Every Linux admin is familiar with the long time running through a large directory tree (with hundred of thousands of files and more) can take. Most are aware that if you re-run the same run-through, it will be shorter. This is caused by a short-valid filesystem cache, where the memory is allocated to other tasks,…