On 11.03.2019 13:39, Phil Turmel wrote: > > FWIW, if a drive claims to support raid1, it has proper timeouts and is suitable for any raid level in linux. Unfortunately this is not true for Western Digital. In the spec sheet for the WD20EARS[1] they have following under applications "Desktop / Consumer RAID Environments - WD Caviar Green Hard Drives are tested and recommended for use in consumer-type RAID applications (RAID-0 / RAID-1)." This is the smart output for a WD20EARS $ sudo smartctl -i -l scterc /dev/sdo | egrep "Model|SCT" Model Family: Western Digital Caviar Green (AF) Device Model: WDC WD20EARS-00J99B0 SCT Error Recovery Control command not supported They do have this in small print "Business Critical RAID Environments – WD Caviar Green Hard Drives are not recommended for and are not warranted for use in RAID environments utilizing Enterprise HBAs and/or expanders and in multi-bay chassis, as they are not designed for, nor tested in, these specific types of RAID applications. For all Business Critical RAID applications, please consider WD’s Enterprise Hard Drives that are specifically designed with RAID-specific, time-limited error recovery (TLER), are tested extensively in 24x7 RAID applications, and include features like enhanced RAFF technology and thermal extended burn-in testing. [1] http://products.wdc.com/library/SpecSheet/ENG/2879-701229.pdf -- Kai Stian Olstad
