4 ms·
I wonder what the io perf will look like during migration. Gut feeling is that going through dm-clone/iscsi/wireguard would be lot slower than direct local nvme
by zokier 2y ago
I wonder what the io perf will look like during migration. Gut feeling is that going through dm-clone/iscsi/wireguard would be lot slower than direct local nvme.
- tptacek 2y agoIt obviously is slower, but note that you take the hit only for the first time any block is read, and not for anything written after migration has started. Our migrations are overwhelmingly intra-region, as well, so really what you're doing approaching the performance envelope of the "standard" SAN topology used for cloud block devices anyways. (I don't want to pretend to know what EBS does to make this fast!)