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diff --git a/doc/book/operations/layout.md b/doc/book/operations/layout.md index 5e314246..39cbcc1c 100644 --- a/doc/book/operations/layout.md +++ b/doc/book/operations/layout.md @@ -75,3 +75,111 @@ If you are using the `garage` CLI to script layout changes, follow the following - **Only call `garage layout apply` once**, and call it **strictly after** all of the `layout assign` and `layout remove` commands have returned. + + +## Understanding unexpected layout calculations + + +### Example 1 + +``` +$ garage layout show +==== CURRENT CLUSTER LAYOUT ==== +ID Tags Zone Capacity Usable capacity +b10c110e4e854e5a node1 dc1 1000.0 MB 1000.0 MB (100.0%) +a235ac7695e0c54d node2 dc2 1000.0 MB 1000.0 MB (100.0%) +62b218d848e86a64 node3 dc3 1000.0 MB 1000.0 MB (100.0%) + +Zone redundancy: maximum + +Current cluster layout version: 6 + +==== STAGED ROLE CHANGES ==== +ID Tags Zone Capacity +a11c7cf18af29737 node4 dc1 1000.0 MB + + +==== NEW CLUSTER LAYOUT AFTER APPLYING CHANGES ==== +ID Tags Zone Capacity Usable capacity +b10c110e4e854e5a node1 dc1 1000.0 MB 1000.0 MB (100.0%) +a11c7cf18af29737 node4 dc1 1000.0 MB 0 B (0.0%) +a235ac7695e0c54d node2 dc2 1000.0 MB 1000.0 MB (100.0%) +62b218d848e86a64 node3 dc3 1000.0 MB 1000.0 MB (100.0%) + +Zone redundancy: maximum + +==== COMPUTATION OF A NEW PARTITION ASSIGNATION ==== + +Partitions are replicated 3 times on at least 3 distinct zones. + +Optimal partition size: 3.9 MB (3.9 MB in previous layout) +Usable capacity / total cluster capacity: 3.0 GB / 4.0 GB (75.0 %) +Effective capacity (replication factor 3): 1000.0 MB + +A total of 0 new copies of partitions need to be transferred. + +dc1 Tags Partitions Capacity Usable capacity + b10c110e4e854e5a node1 256 (0 new) 1000.0 MB 1000.0 MB (100.0%) + a11c7cf18af29737 node4 0 (0 new) 1000.0 MB 0 B (0.0%) + TOTAL 256 (256 unique) 2.0 GB 1000.0 MB (50.0%) + +dc2 Tags Partitions Capacity Usable capacity + a235ac7695e0c54d node2 256 (0 new) 1000.0 MB 1000.0 MB (100.0%) + TOTAL 256 (256 unique) 1000.0 MB 1000.0 MB (100.0%) + +dc3 Tags Partitions Capacity Usable capacity + 62b218d848e86a64 node3 256 (0 new) 1000.0 MB 1000.0 MB (100.0%) + TOTAL 256 (256 unique) 1000.0 MB 1000.0 MB (100.0%) +``` + +### Example 2 + +``` +==== CURRENT CLUSTER LAYOUT ==== +ID Tags Zone Capacity Usable capacity +b10c110e4e854e5a node1 dc1 1000.0 MB 500.0 MB (50.0%) +a11c7cf18af29737 node4 dc1 1000.0 MB 500.0 MB (50.0%) +a235ac7695e0c54d node2 dc2 1000.0 MB 1000.0 MB (100.0%) +62b218d848e86a64 node3 dc3 1000.0 MB 1000.0 MB (100.0%) + +Zone redundancy: maximum + +Current cluster layout version: 8 + +==== STAGED ROLE CHANGES ==== +ID Tags Zone Capacity +a11c7cf18af29737 node4 dc3 1000.0 MB + + +==== NEW CLUSTER LAYOUT AFTER APPLYING CHANGES ==== +ID Tags Zone Capacity Usable capacity +b10c110e4e854e5a node1 dc1 1000.0 MB 1000.0 MB (100.0%) +a235ac7695e0c54d node2 dc2 1000.0 MB 1000.0 MB (100.0%) +62b218d848e86a64 node3 dc3 1000.0 MB 753.9 MB (75.4%) +a11c7cf18af29737 node4 dc3 1000.0 MB 246.1 MB (24.6%) + +Zone redundancy: maximum + +==== COMPUTATION OF A NEW PARTITION ASSIGNATION ==== + +Partitions are replicated 3 times on at least 3 distinct zones. + +Optimal partition size: 3.9 MB (3.9 MB in previous layout) +Usable capacity / total cluster capacity: 3.0 GB / 4.0 GB (75.0 %) +Effective capacity (replication factor 3): 1000.0 MB + +A total of 128 new copies of partitions need to be transferred. + +dc1 Tags Partitions Capacity Usable capacity + b10c110e4e854e5a node1 256 (128 new) 1000.0 MB 1000.0 MB (100.0%) + TOTAL 256 (256 unique) 1000.0 MB 1000.0 MB (100.0%) + +dc2 Tags Partitions Capacity Usable capacity + a235ac7695e0c54d node2 256 (0 new) 1000.0 MB 1000.0 MB (100.0%) + TOTAL 256 (256 unique) 1000.0 MB 1000.0 MB (100.0%) + +dc3 Tags Partitions Capacity Usable capacity + 62b218d848e86a64 node3 193 (0 new) 1000.0 MB 753.9 MB (75.4%) + a11c7cf18af29737 node4 63 (0 new) 1000.0 MB 246.1 MB (24.6%) + TOTAL 256 (256 unique) 2.0 GB 1000.0 MB (50.0%) +``` |