Date: Sat, 19 Aug 2023 12:31:16 +0200 From: Dimitry Andric <dim@FreeBSD.org> To: Graham Perrin <grahamperrin@gmail.com> Cc: freebsd-current@freebsd.org Subject: Re: ZFS deadlock in 14: without ZIL Message-ID: <23BA44D4-8F35-4A0A-87A2-F765FE6D6865@FreeBSD.org> In-Reply-To: <9ba2326b-d5de-5faa-edc8-b1cd7235a51c@gmail.com> References: <59FCB309-4A55-4924-98C4-7ACCA70FD299.ref@yahoo.com> <59FCB309-4A55-4924-98C4-7ACCA70FD299@yahoo.com> <9ba2326b-d5de-5faa-edc8-b1cd7235a51c@gmail.com>
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[-- Attachment #1 --] On 19 Aug 2023, at 09:36, Graham Perrin <grahamperrin@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 [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.2 iF0EARECAB0WIQR6tGLSzjX8bUI5T82wXqMKLiCWowUCZOCZ9AAKCRCwXqMKLiCW o5DuAJ9iKc/jfYMo1yAdw3h6jR0VIOc5ZACgjKEoVL6hYH6m8j3NWKWISg89QHU= =jS53 -----END PGP SIGNATURE-----
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