bucked index, leveldb and journal

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Hi everybody,

I underdstand that radosgw bucket indexes are stored as leveldb files.
Do writes leveldb go though the jounrnal first, or directly to disk?
In other words, do they get the benefits of having a fast journal?

I started investigating disk because I observe a lot of writes to ldb files when I restart an OSD, and I suspect that they are to blame for the slowness in the cluster in that situation.

Thanks,
Ludovico
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