On Wed, Sep 24, 2025 at 08:45:46PM +0000, Andy Smith wrote:
Issues I have personally seen with these types of drives put into a conventional RAID environment: - pitiful random write performance once internal drive caches are exceeded
So that's "random write performance", which is poor on SMR drives regardless of raid.
- extremely slow rebuild/scrub speeds sometimes ten times slower than what I would expect from CMR drives.
This is implementation dependent. There's no particular reason this would be a slow operation for RAID in general, so this suggests the implementation is doing small random writes and not coalescing them into larger writes during this process.