On 19 Jan 2018, at 20:22, Chris Ferebee wrote:
Am 19.01.2018 um 20:00 schrieb Jim Wiggs <[email protected]>:
As I mentioned in a previous reply, I was not aware that ZIL is now
recoverable. My experience with ZFS for KVM workloads has been
solely on Linux, using ZVOLs for my disk images. The word there was
always *mirror your ZIL* or you risked losing the last ~5 seconds
worth of writes if your ZIL device died.
The concern I’ve read about is that you may be running smoothly with
an SSD slog, have a power failure, and find, when you reboot, that the
SSD was actually dead, it just hadn’t stopped moving yet – so it
never comes back on line. I have no idea whether that is a common
failure mode.
When I was running large spinning rust disk farms, a complete power down
often meant that some disks didn't come back. That applied to a clean
shutdown, though not to the same extent as a sudden power loss (e.g. UPS
systems failing, sometimes catastrophically).
Extended power loss not good news as electrical components drop beneath
their normal working temperatures.
Murphy's Law says that sooner or later, the scenario you describe can
happen. Are there any statistics out there for SSDs failing after a
power cycle?
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