Performance

Windows VMs on SUSE Virtualization: Hyper-V enlightenments make the difference

Windows runs best when it knows it’s virtualized. Since SUSE Virtualization 1.9, the Windows templates turn on Hyper-V enlightenments and virtio-blk, which removed periodic I/O stalls, cut a write-heavy phase by 24%, and kept older Windows from losing two-thirds of its random IOPS.

LVM thin storage on SUSE Virtualization: chunk sizes, tuning knobs and encryption

What a summer of work on SUSE Virtualization’s LVM CSI driver taught me: why a thin pool’s chunk size can cost you 98% of your IOPS, what changed upstream, the new VM storage settings in 1.9.1, and what encryption at rest costs.