def tmp_storage(monkeypatch, tmpdir):
"""
Provide a temporary storage for creating temporary block devices, and patch
vsdm to use it instead of multipath device.
"""
storage = tmpstorage.TemporaryStorage(str(tmpdir))
# Get devices from our temporary storage instead of multipath.
monkeypatch.setattr(multipath, "getMPDevNamesIter", storage.devices)
# Use custom /run/vdsm/storage directory, used to keep symlinks to active
# lvs.
storage_dir = str(tmpdir.join("storage"))
os.mkdir(storage_dir)
monkeypatch.setattr(sc, "P_VDSM_STORAGE", storage_dir)
with closing(storage):
# Don't let other test break us...
lvm.invalidateCache()
try:
yield storage
finally:
# and don't break other tests.
lvm.invalidateCache()
stats = lvm.cache_stats()
log.info("LVM cache hit ratio: %.2f%% (hits: %d misses: %d)",
stats["hit_ratio"], stats["hits"], stats["misses"])
def check_stats(hits, misses):
stats = lvm.cache_stats()
assert stats["hits"] == hits
assert stats["misses"] == misses
def _check_lvm_stats(self):
stats = lvm.cache_stats()
self.log.info("LVM cache hit ratio: %.2f%% (hits: %d misses: %d)",
stats["hit_ratio"], stats["hits"], stats["misses"])