I missed some bits where drbdsetup xxx secondary and drbdsetup xxx
secondary are called. My attempt at decoding the call tree is at the end
of the message, but in summary:
* Check /proc/drbd on target, require network is Connected and local
disk is UpToDate. [No check on source?]
* on target: drbdsetup <dev> secondary (just to be sure?). No wait or
status check?
* on both nodes: drbdsetup <dev> disconnect. No wait or status check?
* on both nodes: drbdsetup <dev> connect. Poll /proc/drbd until
connected or syncing
* wait until sync complete
... rest not relevant as it doesn't get this far when it fails
Regards,
Brian.
_ExecMigration(...) [cmdlib.py]
on target node:
_CheckDiskConsistency(...) [cmdlib.py]
_CheckDiskConsistencyInner(...) [cmdlib.py]
AFAICS it seems to call down through to GetSyncStatus [bdev.py]
which calls GetProcStatus which reads */proc/drbd*. Then it returns
is_degraded=True if (not is_connected or not is_disk_uptodate)
_EnsureSecondary(target_node) [cmdlib.py]
for target node only:
call_blockdev_close
perspective_blockdev_close [server/noded.py]
BlockdevClose [backend.py]
Close [bdev.py]
* drbdsetup <dev> secondary*
_GoStandalone() [cmdlib.py]
for both nodes:
call_drbd_disconnect_net
perspective_drbd_disconnect_net [server/noded.py]
DrbdDisconnectNet [backend.py]
DisconnectNet [bdev.py]
_ShutdownNet [bdev.py]
* drbdsetup <dev> disconnect*
_GoReconnect(True) [cmdlib.py]
for both nodes:
call_drbd_attach_net
perspective_drbd_attach_net [server/noded.py]
DrbdAttachNet [backend.py]
AttachNet [bdev.py]
GetProcStatus [bdev.py] - repeat until is_connected or
is_in_resync
_GetProcData - reads */proc/drbd*
_MassageProcData - groups by device
_DRBD8Status(..) - parses one device line
Open [bdev.py]
***drbdsetup <dev> primary*
_WaitUntilSync()
for all nodes: repeat until all_done, display progress message
call_drbd_wait_sync
perspective_drbd_wait_sync
DrbdWaitSync
GetProcStatus
_GetProcData - reads */proc/drbd*
_MassageProcData - groups by device
_DRBD8Status(..) - parses one device line
... do the migration [but when there's a problem it doesn't get this far]
_EnsureSecondary(source_node)
_WaitUntilSync()
_GoStandalone()
_GoReconnect(False)
_WaitUntilSync()
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