```
ubuntu@ip-172-31-79-147:/opt/downloads$ clickhouse-local --max_threads 8 --query "WITH parseDateTimeBestEffort(extract(_path, 'pageviews-([\\d\\-]+)\\.gz$')) AS time, splitByChar(' ', line) AS values, splitByChar('.', values[1]) AS projects SELECT time, projects[1] AS project, projects[2] AS subproject, values[2] AS path, (values[3])::UInt64 AS hits FROM file('pageviews*.gz', LineAsString) WHERE length(values) >= 3" | pv > /dev/null
^C01GiB 0:01:08 [ 129MiB/s] [                                                                                                                                                                   <=>                                                                                    ]

ubuntu@ip-172-31-79-147:/opt/downloads$ clickhouse-local --max_threads 8 --query "WITH parseDateTimeBestEffort(extract(toLowCardinality(_path), 'pageviews-([\\d\\-]+)\\.gz$')) AS time, splitByChar(' ', line) AS values, splitByChar('.', values[1]) AS projects SELECT time, projects[1] AS project, projects[2] AS subproject, values[2] AS path, (values[3])::UInt64 AS hits FROM file('pageviews*.gz', LineAsString) WHERE length(values) >= 3" | pv > /dev/null
^C46GiB 0:00:48 [ 175MiB/s] [                                                                                                                                                                                                                                        <=>               ]
```

{
    if (!storage_policy)
        return;
    const auto & disks = data_volume->getDisks();
    
    ThreadPool pool(disks.size());
    for (const DiskPtr & disk : disks)
    {
        pool.scheduleOrThrowOnError([&]()
        {
            createDirectoryMonitors(disk);
        });
    }
    pool.wait();
    const auto & paths = getDataPaths();
    std::vector<UInt64> last_increment(paths.size());
    for (size_t i = 0; i < paths.size(); ++i)
    {
        pool.scheduleOrThrowOnError([&, i]()
        {
            last_increment[i] = getMaximumFileNumber(paths[i]);
        });
    }
    pool.wait();
    for (const auto inc : last_increment)
    {
        if (inc > file_names_increment.value)
            file_names_increment.value.store(inc);
    }
    LOG_DEBUG(log, "Auto-increment is {}", file_names_increment.value);