perf(storage): ext4 metadata volume for fsync-hot boltdb state (ABX-496) - #497

Merged

AprilNEA merged 10 commits into

perf/ext4-metadata-volume

Jul 22, 2026

Commits on Jul 22, 2026

docs(plans): ext4 metadata volume design for snapshot-prepare fsync cost (ABX-496)
AprilNEA
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d37f19a
feat(core): attach ext4 metadata volume as third block device (ABX-496)
AprilNEA
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152adc4
feat(agent): crash-safe migration state machine for the ext4 metadata volume (ABX-496)
AprilNEA
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6c7931a
feat(agent): mount ext4 metadata volume and bind fsync-hot boltdb dirs (ABX-496)
AprilNEA
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71872d9
perf(agent): drop btrfs NOCOW flagging of metadata dirs (ABX-496)
AprilNEA
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bf6ef65
refactor(storage): declare metadata device on the cmdline, drop guest probing (ABX-496)
AprilNEA
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5eadfbc
chore(assets): pin boot assets v0.6.11 (rootfs ships mkfs.ext4 + e2fsck)
AprilNEA
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1cdb1a0
perf(vz): use fsync-level disk synchronization instead of F_FULLFSYNC (ABX-496)
AprilNEA
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d9d5beb
docs(plans): record ext4 metadata volume implementation results and VZ sync-mode finding
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101ac9b
fix(agent): make migration publish durable before retiring the source
AprilNEA
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96603f2