On 07/07/2021 00:01, Pete Wright wrote:
i also wonder if this could be a TRIM related issue. according to
zpoolprops(8) TRIM is not enabled by default on pools - but it also has
this note (see autotrim):
"Be aware that automatic trimming of recently freed data blocks
can put significant stress on the underlying storage devices.
This will vary depending of how well the specific device handles
these commands. For lower end devices it is often possible to
achieve most of the benefits of automatic trimming by running an
on-demand (manual) TRIM periodically using the zpool trim
command."
I wonder if adjusting the autotrim feature will address these issues - i
manually enable autotrim for my pools and have seen no bad effects under
quite of bit of bursty i/o. if it is enabled i wonder if the ssd you
are using doesn't play nice with autotrim and should stay disabled?
I was thinking this too - the autotrim stuff came in with OpenZFS, but I
had trim enabled previously (I believe we had our own implementation on
FreeBSD ZFS, is that right?). But I am wondering if a schduled trim
might be a better option. Though the question arises as to 'how often'
in that case.
-pete.
