Created new replica pair, determined master using shell db.$cmd.findOne(

);, then from master created capped collection db.createCollection("abc",

); and ran db.abc.validate(); last part of result shows that

ns corrupt, requires dbchk
",
"ok" : 1,
"valid" : false,
"lastExtentSize" : 4194560
}

if i add a record then everything is shown to be fine

deleted: n: 1 size: 4194308
nIndexes:0
",
"ok" : 1,
"valid" : true,
"lastExtentSize" : 4194560
}