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Amazon builds datacenter redundancy in the same geographic locale. You can then setup synchronous replication between datacenters without atrocious latency, as
by pacala 11y ago
Amazon builds datacenter redundancy in the same geographic locale. You can then setup synchronous replication between datacenters without atrocious latency, as all the disks are fairly close by, albeit powered [in an emergency] by independent generators.
OTOH, Google does datacenter redundancy across different locales, which make synchronous replication perform much worse, like you noted.
- wmf 11y agoGCE appears to have a similar region/zone structure as Amazon, but neither provider replicates block storage across zones.
- pacala 11y agoI stand corrected. Looking at https://cloud.google.com/compute/docs/zones?hl=en https://cloud.google.com/compute/docs/zones?hl=en, it seems that GCE has multiple zones in the same locale (region). I might have confused with Google's internal setup, which during my tenure there, was heavy on using replication across locales, up to systems like Megastore and the 200ms synchronously replicated commit.