Why is MongoDB preallocating so many data files at once? -

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our mongodb sitting @ 1.2tb. have 2tb total disk space on server, , within 1 evening created few 2gb data files, using disk space , crashing process.

when looked @ data files, noticed preallocates few of these files every couple of days, @ 1 point generating more 140gb of files.

how can control this?

if want control size of generated data files have following options available when starting mongod:


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