improve rescue of VM when node fail is detected #70
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* Introduce new LCM states PROLOG_MIGRATE_UNKNOWN and PROLOG_MIGRATE_UNKNOWN_FAILURE * Change VM migrate logic for when state is ACTIVE and lcm_state is UNKNOWN to call TM's PROLOG_MIGR action before VMM's BOOT All core TM drivers that are not empty are skipping disks so there is no impact on the default behaviour The datastore addon drivers that implement access to raw block devices should check if the LCM_STATE == 60 (PROLOG_MIGRATE_UNKNOWN) and to remove block device access from the failed node and provide access to the current node. There is a simple script function added to get LCM_STATE that can be used as follow ```bash LCM_STATE=$(lcm_state) if [ "$LCM_STATE" = "60" ] fi ```
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This pull request should be linked to feature request #3958 but I messed the "Pull request" field there. |
atodorov-storpool
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When we are called in PROLOG_MIGRATE_UNKNOWN LCM state the SRC_HOST is most probably DOWN so run detach command on DST host. Hopefully a proposed patch to call tm/mv bofore trying to boot VM from failed Host will be merged [pull request #70](OpenNebula/one#70) to utilize this feature
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This is no merged in master. THANKS! |
rsmontero
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rsmontero
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Jan 20, 2021
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call TM's PROLOG_MIGR action before VMM's BOOT
All core TM drivers that are not empty are skipping disks so there is no impact on
the default behavior
The datastore addon drivers that implement access to raw block devices should check
if the LCM_STATE == 60 (PROLOG_MIGRATE_UNKNOWN) and to remove block device access
from the failed node and provide access to the current node.
There is a simple script function added to get LCM_STATE that can be used as follow