def get_internal_md_kiB(cls, is_net_size, size_kiB, peers, al_stripes,
al_stripe_kiB):
"""
Returns the amount of storage required for internal meta data
"""
if type(is_net_size) is not bool:
logging.error(
"Implementation error: Incorrect use of "
"drbdmanage.drbd.metadata.MetaData.get_internal_md_kiB")
raise dmexc.DebugException
size_kiB = long(size_kiB)
peers = int(peers)
al_stripes = int(al_stripes)
al_stripe_kiB = int(al_stripe_kiB)
size_kiB = utils.align_up(size_kiB, MetaData.DRBD_BM_BIT_COVER_kiB)
al_kiB = MetaData._get_al_kiB(al_stripes, al_stripe_kiB)
md_kiB = 0
if is_net_size:
bitmap_kiB = MetaData._get_bitmap_internal_kiB_net(
size_kiB, peers, al_stripes, al_stripe_kiB)
md_kiB = utils.align_up(
al_kiB + bitmap_kiB + MetaData.DRBD_MD_SUPERBLK_kiB,
MetaData.DRBD_MD_ALIGN_kiB)
else:
bitmap_kiB = MetaData._get_bitmap_internal_kiB_gross(
size_kiB, peers)
md_kiB = utils.align_up(
al_kiB + bitmap_kiB + MetaData.DRBD_MD_SUPERBLK_kiB,
MetaData.DRBD_MD_ALIGN_kiB)
return md_kiB
def get_gross_kiB(cls, net_kiB, peers, al_stripes, al_stripe_kiB):
"""
Returns the backend storage gross size required to provide the specified net size
"""
net_kiB = long(net_kiB)
peers = int(peers)
al_stripes = int(al_stripes)
al_stripe_kiB = int(al_stripe_kiB)
# BEGIN HOTFIX
# FIXME: Hotfix for resizing restored snapshots
# after reducing the number of maximum peers
peers = consts.HOTFIX_MAX_PEERS
# END HOTFIX
gross_kiB = 0
bitmap_kiB = MetaData._get_bitmap_internal_kiB_net(
net_kiB, peers, al_stripes, al_stripe_kiB)
al_kiB = MetaData._get_al_kiB(al_stripes, al_stripe_kiB)
md_kiB = utils.align_up(
bitmap_kiB + al_kiB + MetaData.DRBD_MD_SUPERBLK_kiB,
MetaData.DRBD_MD_ALIGN_kiB)
gross_kiB = utils.align_up(net_kiB,
MetaData.DRBD_BM_BIT_COVER_kiB) + md_kiB
check_max_drbd_kiB(gross_kiB)
if gross_kiB < MetaData.DRBD_MIN_GROSS_kiB:
gross_kiB = MetaData.DRBD_MIN_GROSS_kiB
return gross_kiB
def _get_bitmap_internal_kiB_net(cls, net_kiB, peers, al_stripes,
al_stripe_kiB):
net_kiB = long(net_kiB)
peers = int(peers)
al_stripes = int(al_stripes)
al_stripe_kiB = int(al_stripe_kiB)
check_min_drbd_kiB_net(net_kiB)
check_max_drbd_kiB(net_kiB)
check_peers(peers)
al_kiB = MetaData._get_al_kiB(al_stripes, al_stripe_kiB)
# Base size for the recalculation of the gross size
# in each iteration of the sequence limit loop
# The base size is the net data + activity log + superblock,
# but without the bitmap, therefore:
# base_size_kiB + bitmap_kiB == gross_kiB
base_kiB = net_kiB + al_kiB + MetaData.DRBD_MD_SUPERBLK_kiB
# Calculate the size of the bitmap required to cover the
# gross size of the device, which includes the size of the bitmap.
gross_kiB = base_kiB
bitmap_kiB = 0
bitmap_cover_kiB = 0
while bitmap_cover_kiB < gross_kiB:
# Bitmap size required to cover the gross size on each peer
bitmap_peer_b = utils.ceiling_divide(
gross_kiB, MetaData.DRBD_BM_BYTE_COVER_kiB)
# Align to the per-peer bitmap granularity
bitmap_peer_b = utils.align_up(bitmap_peer_b,
MetaData.DRBD_BM_PEER_ALIGN)
# Bitmap size for all peers
bitmap_b = bitmap_peer_b * peers
# Gross size covered by the current bitmap size
bitmap_cover_kiB = bitmap_peer_b * MetaData.DRBD_BM_BYTE_COVER_kiB
# Actual size of the bitmap in the DRBD metadata area (after alignment)
bitmap_kiB = utils.align_up(
utils.align_up(bitmap_b, 1024) / 1024,
MetaData.DRBD_BM_ALIGN_kiB)
# Resulting gross size after including the bitmap size
gross_kiB = base_kiB + bitmap_kiB
check_max_drbd_kiB(gross_kiB)
return bitmap_kiB
def get_net_kiB(cls, gross_kiB, peers, al_stripes, al_stripe_kiB):
"""
Returns the net size that can be provided by a backend storage with the specified gross size
"""
gross_kiB = long(gross_kiB)
peers = int(peers)
al_stripes = int(al_stripes)
al_stripe_kiB = int(al_stripe_kiB)
net_kiB = 0
bitmap_kiB = MetaData._get_bitmap_internal_kiB_gross(gross_kiB, peers)
al_kiB = MetaData._get_al_kiB(al_stripes, al_stripe_kiB)
md_kiB = utils.align_up(
bitmap_kiB + al_kiB + MetaData.DRBD_MD_SUPERBLK_kiB,
MetaData.DRBD_MD_ALIGN_kiB)
gross_kiB = utils.align_down(gross_kiB, MetaData.DRBD_BM_BIT_COVER_kiB)
if md_kiB < gross_kiB:
net_kiB = gross_kiB - md_kiB
else:
raise MinSizeException(
"The specified DRBD volume gross size (%d kiB) is too small to keep the volume's meta data area"
% (gross_kiB))
return net_kiB
def _get_al_kiB(cls, al_stripes, al_stripe_kiB):
al_stripes = int(al_stripes)
al_stripe_kiB = long(al_stripe_kiB)
if al_stripes < 1:
raise AlStripesException(
"Number of activity log strips (%d) is smaller than the minimum of 1"
% (al_stripes))
if al_stripe_kiB < 1:
raise MinAlSizeException(
"Activity log stripe size (%d kiB) is smaller than the minimum of 1 kiB"
% (al_stripe_kiB))
if al_stripe_kiB > MetaData.DRBD_MAX_AL_kiB:
raise MaxAlSizeException(
"Activity log stripe size (%d kiB) is larger than the maximum of %d kiB"
% (al_stripe_kiB, MetaData.DRBD_MAX_AL_kiB))
al_kiB = al_stripe_kiB * al_stripes
al_kiB = utils.align_up(al_kiB, MetaData.DRBD_AL_ALIGN_kiB)
if al_kiB < MetaData.DRBD_MIN_AL_kiB:
raise MinAlSizeException(
"Activity log total size (%d kiB) is smaller than the minimum of 1 kiB"
% (al_stripe_kiB))
elif al_kiB > MetaData.DRBD_MAX_AL_kiB:
raise MaxAlSizeException(
"Activity log total size (%d kiB) is larger than the maximum of %d kiB"
% (al_stripe_kiB, MetaData.DRBD_MAX_AL_kiB))
return al_kiB
def _get_bitmap_external_kiB(cls, size_kiB, peers):
size_kiB = long(size_kiB)
peers = int(peers)
check_max_drbd_kiB(size_kiB)
check_peers(peers)
size_kiB = utils.align_up(size_kiB, MetaData.DRBD_BM_BIT_COVER_kiB)
bitmap_peer_b = utils.ceiling_divide(size_kiB,
MetaData.DRBD_BM_BYTE_COVER_kiB)
bitmap_peer_b = utils.align_up(bitmap_peer_b,
MetaData.DRBD_BM_PEER_ALIGN)
bitmap_b = bitmap_peer_b * peers
bitmap_kiB = utils.align_up(
utils.align_up(bitmap_b, 1024) / 1024, MetaData.DRBD_BM_ALIGN_kiB)
return bitmap_kiB
def _get_bitmap_internal_kiB_gross(cls, gross_kiB, peers):
gross_kiB = long(gross_kiB)
peers = int(peers)
check_min_drbd_kiB_gross(gross_kiB)
check_max_drbd_kiB(gross_kiB)
check_peers(peers)
gross_kiB = utils.align_up(gross_kiB, MetaData.DRBD_BM_BIT_COVER_kiB)
bitmap_peer_b = utils.ceiling_divide(gross_kiB,
MetaData.DRBD_BM_BYTE_COVER_kiB)
bitmap_peer_b = utils.align_up(bitmap_peer_b,
MetaData.DRBD_BM_PEER_ALIGN)
bitmap_b = bitmap_peer_b * peers
bitmap_kiB = utils.align_up(
utils.align_up(bitmap_b, 1024) / 1024, MetaData.DRBD_BM_ALIGN_kiB)
return bitmap_kiB
def get_external_md_kiB(cls, size_kiB, peers, al_stripes, al_stripe_kiB):
"""
Returns the amount of storage required for external meta data
"""
size_kiB = long(size_kiB)
peers = int(peers)
al_stripes = int(al_stripes)
al_stripe_kiB = int(al_stripe_kiB)
md_kiB = 0
check_max_drbd_kiB(size_kiB)
check_peers(peers)
size_kiB = utils.align_up(size_kiB, MetaData.DRBD_BM_BIT_COVER_kiB)
al_kiB = MetaData._get_al_kiB(al_stripes, al_stripe_kiB)
bitmap_kiB = MetaData._get_bitmap_external_kiB(size_kiB, peers)
md_kiB = utils.align_up(
al_kiB + bitmap_kiB + MetaData.DRBD_MD_SUPERBLK_kiB,
MetaData.DRBD_MD_ALIGN_kiB)
return md_kiB