On 19 Aug 2023, at 09:36, Graham Perrin <grahamper...@gmail.com> wrote: > > On 19/08/2023 00:03, Mark Millard wrote: >> I believe the below quoted messages were reports of deadlocks >> based on after the following 2 MFV being in place in their >> environments: >> >> Thu, 10 Aug 2023 >> . . . >> • git: cd25b0f740f8 - main - zfs: cherry-pick fix from openzfs Martin >> Matuska >> • git: 28d2e3b5dedf - main - zfs: cherry-pick fix from openzfs Martin >> Matuska >> >> >> … > > Both were ZIL-related. > > <https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=271945#c0> no ZIL; I never > used the feature.
The ZIL always exists, but it can be stored on a separate device for
performance reasons. See zpoolconcepts(7), the Intent Log section:
By default, the intent log is allocated from blocks within the main pool.
However, it might be possible to get better performance using separate
intent log devices such as NVRAM or a dedicated disk. For example:
# zpool create pool sda sdb log sdc
-Dimitry
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