openstack/ironic
Code Issues Proposed changes

Make DD block size adjustable

Browse Source 
Currently the block size for DD operations is hard coded to 1 meg.
In some enviroments, like where nodes block storage is SAN or NAS based
this may be causing sub par performance, This patch makes the block
size for DD operations adjustable via a conf file option.

Closes-bug: #1411002
Change-Id: I49bf538988ba2fa40047d4ffeffb416ba232e3f2
This commit is contained in:
Chris Krelle 2015-01-14 13:59:24 -08:00
parent 733efae859
commit 370fea3c11
2 changed files with 20 additions and 2 deletions
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11
etc/ironic/ironic.conf.sample
View File

@ -724,6 +724,17 @@
#mysql_engine=InnoDB
[deploy]
#
# Options defined in ironic.drivers.modules.deploy_utils
#
# Block size to use when writing to the nodes disk. (string
# value)
#dd_block_size=1M
[dhcp]
#

11
ironic/drivers/modules/deploy_utils.py
View File

@ -36,9 +36,16 @@ from ironic.drivers.modules import image_cache
from ironic.openstack.common import log as logging
LOG = logging.getLogger(__name__)
deploy_opts = [
cfg.StrOpt('dd_block_size',
default='1M',
help='Block size to use when writing to the nodes disk.'),
]
CONF = cfg.CONF
CONF.register_opts(deploy_opts, group='deploy')
LOG = logging.getLogger(__name__)
# All functions are called from deploy() directly or indirectly.
@ -144,7 +151,7 @@ def is_block_device(dev):
def dd(src, dst):
"""Execute dd from src to dst."""
utils.dd(src, dst, 'bs=1M', 'oflag=direct')
utils.dd(src, dst, 'bs=%s' % CONF.deploy.dd_block_size, 'oflag=direct')
def populate_image(src, dst):