QCOW2 support on XOSTOR
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What's the current status and/or roadmap for QCOW2 support on XOSTOR?
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I will leave the @Team-Storage to answer that
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@TestForEcho No ETA for now. Even before supporting QCOW2 on LINSTOR, we have several points to robustify (HA performance, potential race conditions, etc.). Regarding other important points:
- Supporting volumes larger than 2TB has significant impacts on synchronization, RAM usage, coalesce, etc. We need to find a way to cope with these changes.
- The coalesce algorithm should be changed to no longer depend on the write speed to the SR in order to prevent potential coalesce interruptions; this is even more crucial for LINSTOR.
- The coalesce behavior is not exactly the same for QCOW2, and we believe that currently this could negatively impact the API impl in the case of LINSTOR.
In short: QCOW2 has led to changes that require a long-term investment in several topics before even considering supporting this format on XOSTOR.
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