def remove(self):
"""Remove the LVM snapshot"""
self.run_callback('preremove', self.snapshot)
try:
self.snapshot.refresh()
total_snapshot_space = int(self.snapshot.lv_size)
snap_percent_used = float(self.snapshot.snap_percent)
used_snapshot_space = total_snapshot_space*(snap_percent_used/100.0)
LOGGER.info("Final snapshot size %s [%.2f%% of %s]",
format_bytes(used_snapshot_space),
snap_percent_used,
format_bytes(total_snapshot_space)
)
except LVMError, exc:
LOGGER.info("Failed to refresh snapshot: %s", exc)
def create_snapshot(self):
"""Snapshot the target LVM volume
Before the snapshot is taken, a 'presnapshot'
callback will be run.
After the snapshot is taken, a postsnapshot
callback will be run.
"""
LOGGER.info("Running pre-snapshot tasks")
self.run_callback('presnapshot')
try:
self.snapshot = self.logical_volume.snapshot(self.snapshot_name,
self.snapshot_size)
LOGGER.info("Created snapshot /dev/%s/%s [%s] from logical volume"
" /dev/%s/%s",
self.snapshot.vg_name,
self.snapshot.lv_name,
format_bytes(int(self.snapshot.lv_size)),
self.logical_volume.vg_name,
self.logical_volume.lv_name)
except EnvironmentError, exc: # covers LVMError,OSError, etc.
# Log error
# go to 'remove' state
LOGGER.error("Failed to snapshot %s/%s: %s",
self.logical_volume.vg_name,
self.logical_volume.lv_name,
exc)
return self.cleanup()
