Re:File Systems, Data Loss and ZFS
by ryao on Friday September 19, 2014 @10:38AM
(#8340683)
I usually advise people to avoid hardware RAID controllers on the basis that they introduce unnecessary risk. If you want speed, it is best to use a device like the ZeusRAM as a SLOG device:
As for other devices, it is possible for bugs in software block devices to cause reordering across flushes. Finding out requires reviewing the code for any way that an IO before a flush can occur after it. This is a better situation than that with hardware RAID controllers, whose firmware is closed source and cannot be inspected.
http://www.hgst.com/solid-state-storage/enterprise-ssd/sas-s...
As for other devices, it is possible for bugs in software block devices to cause reordering across flushes. Finding out requires reviewing the code for any way that an IO before a flush can occur after it. This is a better situation than that with hardware RAID controllers, whose firmware is closed source and cannot be inspected.