func IsValidforReadAheadKB(blockdev, readahead string) bool {
    elev, _ := system.GetSysChoice(path.Join("block", blockdev, "queue", "scheduler"))
    if elev != "" && elev != "NA" && elev != "PNA" {
        file := path.Join("block", blockdev, "queue", "read_ahead_kb")
        if tstErr := system.TestSysString(file, readahead); tstErr == nil {