Revision fd791263
| ID | fd7912637b1330ab053981004327d5125045b2a6 |
Pause DRBD sync for OS install if no_wait_for_sync
When no_wait_for_sync is specified 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>
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