28.01.2021 17:21, Per Jessen пишет:
No, harddisks generally have write cache disabled
Consumer hard disks generally have write cache enabled because it is
good for benchmarks (and performance as perceived by users).
[ 1.894064] sd 1:0:0:0: [sda] Write cache: enabled, read cache:
enabled, doesn't support DPO or FUA
They are not specifically made for raid - WDC used to have a series
called "RAID edition", but I think they've stopped that.
They usually have different default settings (well known recovery
timeout as example) and may have better quality control. HDD write cache
is controlled by RAID controllers (which can explicitly enable or
disable it or just leave it as is).