Hi All,
was searching and reviewing few new HDD for backup purpose from WD and Segate and come across shocking this about their capabilities.
SMR drives perform poorly than CMR drives.
However, SMR drives are not intended for random write IO use cases because the write performance is much slower than with a non-SMR drive. Therefore they are not recommended for NAS use cases featuring significant random write workloads.
“WD and Seagate are _both_ shipping drive-managed SMR (DM-SMR) drives which don’t report themselves as SMR when questioned via conventional means. What’s worse, they’re shipping DM-SMR drives as “RAID” and “NAS” drives This is causing MAJOR problems – such as the latest iteration of WD REDs (WDx0EFAX replacing WDx0EFRX) being unable to be used for rebuilding RAID[56] or ZFS RAIDZ sets: They rebuiild for a while (1-2 hours), then throw errors and get kicked out of the set.”
“Currently, Western Digital’s WD Red 2TB-6TB drives are device-managed SMR (DMSMR). WD Red 8TB-14TB drives are CMR-based.
Please check following link from Segate before buying HDD
https://www.seagate.com/in/en/internal-hard-drives/cmr-smr-list/
was searching and reviewing few new HDD for backup purpose from WD and Segate and come across shocking this about their capabilities.
SMR drives perform poorly than CMR drives.
SMR drives
Shingled media recording (SMR) disk drives take advantage of disk write tracks being wider than read tracks to partially overlap write tracks and so enable more tracks to be written to a disk platter. This means more data can be stored on a shingled disk than an ordinary drive.However, SMR drives are not intended for random write IO use cases because the write performance is much slower than with a non-SMR drive. Therefore they are not recommended for NAS use cases featuring significant random write workloads.
“WD and Seagate are _both_ shipping drive-managed SMR (DM-SMR) drives which don’t report themselves as SMR when questioned via conventional means. What’s worse, they’re shipping DM-SMR drives as “RAID” and “NAS” drives This is causing MAJOR problems – such as the latest iteration of WD REDs (WDx0EFAX replacing WDx0EFRX) being unable to be used for rebuilding RAID[56] or ZFS RAIDZ sets: They rebuiild for a while (1-2 hours), then throw errors and get kicked out of the set.”
“Currently, Western Digital’s WD Red 2TB-6TB drives are device-managed SMR (DMSMR). WD Red 8TB-14TB drives are CMR-based.
Please check following link from Segate before buying HDD
https://www.seagate.com/in/en/internal-hard-drives/cmr-smr-list/