def test_vgchunk_with_cache_pvfree(self):
pv = StorageDevice("pv1", size=Size("40 GiB"), fmt=get_format("lvmpv"))
# 1069 MiB so that the PV provides 1068 MiB of free space (see
# LVMVolumeGroupDevice.extents) which is 44 MiB more than the caches
# need and which should thus be split into the LVs
pv2 = StorageDevice("pv2",
size=Size("1069 MiB"),
fmt=get_format("lvmpv"))
vg = LVMVolumeGroupDevice("vg", parents=[pv, pv2])
cache_req1 = LVMCacheRequest(Size("512 MiB"), [pv2], "writethrough")
lv1 = LVMLogicalVolumeDevice("lv1",
parents=[vg],
size=Size("1 GiB"),
grow=True,
cache_request=cache_req1)
cache_req2 = LVMCacheRequest(Size("512 MiB"), [pv2], "writethrough")
lv2 = LVMLogicalVolumeDevice("lv2",
parents=[vg],
size=Size("10 GiB"),
grow=True,
cache_request=cache_req2)
lv3 = LVMLogicalVolumeDevice("lv3",
parents=[vg],
size=Size("10 GiB"),
grow=True,
maxsize=Size("12 GiB"))
req1 = LVRequest(lv1)
req2 = LVRequest(lv2)
req3 = LVRequest(lv3)
chunk = VGChunk(vg, requests=[req1, req2, req3])
chunk.grow_requests()
# the chunk is done growing since its pool has been exhausted
self.assertEqual(chunk.done, True)
# there are still two requests remaining since lv1 and lv2 have no max
self.assertEqual(chunk.remaining, 2)
# All the sizes should be the same as without the caches (see the
# test_vgchunk test for their "rationales") because the space for the
# caches should just be reserved.
# The extra 11 extents available on the pv2 should go in the 1:10 ratio
# to req1 and req2.
self.assertEqual(req1.growth, 395 + 1)
self.assertEqual(req2.growth, 3956 + 10)
self.assertEqual(req3.growth, 512)
def test_vgchunk(self):
pv = StorageDevice("pv1", size=Size("40 GiB"), fmt=get_format("lvmpv"))
vg = LVMVolumeGroupDevice("vg", parents=[pv])
lv1 = LVMLogicalVolumeDevice("lv1",
parents=[vg],
size=Size("1 GiB"),
grow=True)
lv2 = LVMLogicalVolumeDevice("lv2",
parents=[vg],
size=Size("10 GiB"),
grow=True)
lv3 = LVMLogicalVolumeDevice("lv3",
parents=[vg],
size=Size("10 GiB"),
grow=True,
maxsize=Size("12 GiB"))
req1 = LVRequest(lv1)
req2 = LVRequest(lv2)
req3 = LVRequest(lv3)
chunk = VGChunk(vg, requests=[req1, req2, req3])
self.assertEqual(chunk.length, vg.extents)
self.assertEqual(chunk.pool, vg.free_extents)
base_size = vg.align(sum((lv.size for lv in vg.lvs), Size(0)),
roundup=True)
base = base_size / vg.pe_size
self.assertEqual(chunk.base, base)
# default extent size is 4 MiB
self.assertEqual(chunk.length_to_size(4), Size("16 MiB"))
self.assertEqual(chunk.size_to_length(Size("33 MiB")), 8)
self.assertEqual(chunk.has_growable, True)
self.assertEqual(chunk.remaining, 3)
self.assertEqual(chunk.done, False)
chunk.grow_requests()
# the chunk is done growing since its pool has been exhausted
self.assertEqual(chunk.done, True)
# there are still two requests remaining since lv1 and lv2 have no max
self.assertEqual(chunk.remaining, 2)
#
# validate the resulting growth
#
# lv1 has size 1 GiB (256 extents) and is growable with no limit
# lv2 has size 10 GiB (2560 extents) and is growable with no limit
# lv3 has size 10 GiB (2560 extents) and is growable with a max size of
# 12 GiB (max growth of 512 extents)
#
# The vg initially has 4863 free extents.
# The growth ratio should be 1:10:10.
#
# The first pass through should allocate 231 extents to lv1 and 2315
# extents to each of lv2 and lv3, leaving one remaining extent, but
# it should reclaim 1803 extents from lv3 since it has a maximum growth
# of 512 extents (2 GiB).
#
# The second pass should then split up the remaining 1805 extents
# between lv1 and lv2 at a ratio of 1:10, which ends up being 164 for
# lv1 and 1640 for lv2. The remaining extent goes to lv2 because it is
# first in the list after sorting with blivet.partitioning.lv_compare.
#
# Grand totals should be as follows:
# lv1 should grow by 395 extents, or 1.54 GiB
# lv2 should grow by 3956 extents, or 15.45 GiB
# lv3 should grow by 512 extents, or 2 GiB
self.assertEqual(req1.growth, 395)
self.assertEqual(req2.growth, 3956)
self.assertEqual(req3.growth, 512)