oVirt 4k - teaching an old dog new tricks
summary
oVirt gains full 4k-capable storage: implemented storage format v5, changed internal APIs so sizes are stored in bytes not sectors, added sanlock 4k APIs and improved qemu block-size detection. VDO (Linux dedupe/compression) is supported and claims up to 10x space savings; alignment rules change (default 250 hosts for 1 MiB alignment, down from 2000). Block-size detection on file-backed domains now probes with increasing direct I/O sizes; guests still see 512-byte logical sectors and write emulation handles smaller writes, functional but performance impact not yet quantified.
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