Revision 41e1e79e
| ID | 41e1e79ec919ff9f92b945d11af1fe597b75e57a |
Pause DRBD sync for OS install if not wait_for_sync
When wait_for_sync is set to False in LUInstanceCreate, Ganeti lets DRBD sync
in the background while performing the rest of the installation steps,
including OS installation.
However, OS installation is a very disk-intensive task that intereferes badly
with the background I/O caused by DRBD's initial sync. To this end, we pause
the background sync before OS installation and unpause it afterwards, which
yields a significant speed boost for OS installation. The following should be
noted:
a) The user has requested not to wait for sync, i.e. the instance will be
non-redundant for an unspecified interval anyway and delaying this by a
couple of minutes is not a big compromise.
b) This approach is also followed during disk wiping.
Signed-off-by: Apollon Oikonomopoulos <apollon@noc.grnet.gr>
[iustin@google.com: simplify an if check]
Signed-off-by: Iustin Pop <iustin@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>
Files
- added
- modified
- copied
- renamed
- deleted