def should_skip(self, test) -> (bool, str):
        skip_categories = [
            ("disagg",               "Disagg tests already turn on the proper stuff"),
            ("inmem",                "In memory tests don't make sense with disagg storage"),
            ...,
            ...,
            ("tiered",               "Tiered tests do not apply to disagg"),        ]
        for (skip_string, skip_reason) in skip_categories:
            if skip_string in str(test):
                return (True, skip_reason)
        return (False, None) 

tiered_storage_sources = [
    ('dir_store', dict(is_tiered = True, ...)),
    (...),
    (...),
    ('non_tiered', dict(is_tiered = False)),
]