2 ms·
DMSMR is TERRIBLE for a DVR workload. It writes first to a CMR cache and then flushes to SMR when the drive isn't busy. With a DVR the drive is never not going
by throwaway48476 2y ago
DMSMR is TERRIBLE for a DVR workload. It writes first to a CMR cache and then flushes to SMR when the drive isn't busy. With a DVR the drive is never not going to be busy. Further the pitiful write speed of SMR is likely not enough for a modern high resolution security camera installation.
- yencabulator 2y agoAt least for some brands/models, a workload of purely sequential large writes doesn't exhibit that slowdown -- so I'm assuming they go straight to an open SMR zone. There might be an extra criteria where the rate of writes has be just below some threshold so the drive has time to seal full zone & open up a new one in time, to avoid CMR buffering.