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NVSL / linux-nova

NOVA is a log-structured file system designed for byte-addressable non-volatile memories, developed at the University of California, San Diego.
http://nvsl.ucsd.edu/index.php?path=projects/nova
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NOVA-strict #90

Closed Xarboule closed 3 years ago

Xarboule commented 3 years ago

In the SplitFS paper (SOSP19) is mentioned a "NOVA-strict" mode. 1) Do you have an option somewhere to enable this mode ? 2) Does this strict mode give us linearizability ? If not, what kind of durability guarantees does it provide ?

Thank you !

Andiry commented 3 years ago

  1. Please check the module parameters in fs/nova/super.c. With strict mode we enable metadata_csum, data_csum, data_parity, dram_struct_csum and wprotect.

  2. Even the relaxed mode gives linearizability. NOVA guarantees both data and metadata are linearized and persisted when the write() returns. If user uses DAX-mmap, then it is the user's responsibility to make data durable.