Recovering MFS Master Node Using Metalogger After Node Failure
When the mfsmaster node in a six‑node MFS distributed storage cluster becomes unresponsive, the issue can be resolved by using metalogger on another node to restore the metadata file, copy it to the master directory, adjust permissions, and restart the mfsmaster service.
In a six‑node MFS distributed storage deployment, node4 (the mfsmaster) became unresponsive due to high load, while nodes 1‑6 served as mfschunkservers with metalogger services running. The plan was to switch the master role to node6.
The failure of the mfsmaster caused mfsmount to fail, requiring restoration of the master’s metadata using metalogger.
On either node2 or node3, run the metalogger restore command:
mfsmetarestore -m metadata_ml.mfs.back -o metadata.mfs changelog_ml.*.mfsThen copy the resulting metadata.mfs to the mfsmaster directory, adjust its owner and group, and finally restart the mfsmaster service.
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