Date: Fri, 19 Sep 2025 06:07:46 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 289690] dynamic_gang_header is not sported by current loader Message-ID: <bug-289690-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=289690 Bug ID: 289690 Summary: dynamic_gang_header is not sported by current loader Product: Base System Version: 15.0-STABLE Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: arcade@b1t.name Hello again. First let me link an old issue from long time ago: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=144214 I have an issue booting host due to gang blocks again. In this case however we are talking about feature, though. In OpenZFS 2.4.0 (introduced in FreeBSD 15) new feature was added to allow bigger gang blocks - dynamic_gang_header. When this feature becomes active booting from pool is impossible with our loader, as it refuses to work on pool with that feature enabled. So: 1. Create a pool with 15-STABLE or later (feature is enabled by default). 2. Do some fragmentation. In my case pool was 60% full, though I used zfs rewrite a lot. 3. Can't boot. I don't think any feasible recovery is possible this time, as once feature becomes active pool becomes unbootable, but there's no way to check which files are actually need to be rewritten to eliminate gang blocks, any fragmented file, anywhere on fs can cause this. -- You are receiving this mail because: You are the assignee for the bug.home | help
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