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Chris Lu
088e26ea68
In a multi-disk volume server, ec.balance and ec.rebuild can land shards on a disk that does not also hold the matching .ecx / .ecj / .vif index files. The orphan-shard reconciler in reconcileEcShardsAcrossDisks already loads those shards by pointing the EcVolume at the sibling disk's index files; reads work, but any failure on the index-owning disk silently disables every shard on the other disk, even though those shards are physically fine. This change adds mirrorEcMetadataToShardDisks, a startup pass that physically replicates .ecx / .ecj / .vif onto each disk that holds shards but is missing them. Each copy is atomic (tmp + fsync + rename) and idempotent (a destination that already has the sidecar is preserved). After mirroring, the cross-disk reconciler prefers the local IdxDirectory so the EcVolume mounts self-contained; the cross-disk virtual mount remains as a fallback for volumes whose mirror failed (read-only target, out of space, partial copy on a previous boot). The same-disk invariant the EC lifecycle (encode / decode / balance / vacuum / repair) was already documented as promising is now actually restored at boot, so a future failure of one disk in a split-shards layout no longer takes the other disk's shards with it. Tests cover the orphan-layout mirror (dir0 receives the .ecx / .ecj / .vif from dir1) and idempotency (an existing destination .ecx is not overwritten with the owner's copy).