https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=232683
Bug ID: 232683
Summary: [gmirror] gmirror could provide much better
administrative introspection into decision-making
processes
Product: Base System
Version: CURRENT
Hardware: Any
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: b...@freebsd.org
Reporter: c...@freebsd.org
CC: g...@freebsd.org, ma...@freebsd.org
Depends on: 232671
+++ This bug was initially created as a clone of Bug #232671 +++
I'd like the gmirror softc and individual gmirror disk elements to record two
formatted messages:
1. Why did we switch to the current state from the previous one?
2. Why *haven't* we switched to some next state, where there is an obvious
linear sequence of transitions.
Additionally, I'd like that information available in DDB and perhaps the
runtime geom commands. It may also be useful for printing at mountroot panics.
For the scenario described in the bug this was cloned from, that might be:
root0.why_status = "Found enough (2/2) disks in ANY state and found 0 dirty
disks (unforced)"
root0.why_not_next = "n/a"
root0.why_destroy = "0/2 mirror disks in ACTIVE or NEW state (need at least 1)"
da2p5.why_status = "broken (stale): old generation id N; current mirrorset
generation is M"
da2p5.why_not_next = "n/a"
da16p3.why_status = "Synchronizing: Part of active mirrorset generation (NN),
but initiated synchronization operation has not completed"
da16p3.why_not_next = "Synchronizing: progress: N/M bytes; last forward
progress at time TTTT"
In that scenario, da15p3 never made it in time for the mirror to still exist,
but if it had:
da15p3.why_status = "Clean mirror with active mirrorset generation (NN)"
da15p3.why_not_next = "n/a"
Referenced Bugs:
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=232671
[Bug 232671] [gmirror] gmirror fails to recover from degraded mirror sets in
some circumstances
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