Details
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Improvement
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Resolution: Fixed
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Minor
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None
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17393
Description
A site had two last_rcvd files corrupted on two OSTs. They were able to truncate the files and the OSTs mounted OK. But I wonder whether we could increase data redundancy for meta data such as the last_rcvd file, to make it harder to corrupt in the first place (or more accurately to make it easier for scrub to repair it should it ever get corrupted).
The OIs already get two copies of its data blocks as they are ZAPs. But other meta data like last_rcvd get only one copy of the data. The copies property can only be applied at per file system granularity. We can put those files under a separate dataset, e.g. lustre-ost1/ost1/META, and set copies=2 for it. But it'd complicate the code as now there's two datasets per OST.