Examples
Examples
Try the starting example
- Backup copies: ID, domains whose failure disables that copy, joined by |
- A,acct1|site1 B,acct1|site2 C,acct2|site1
- Minimum named-domain failures disabling every supplied copy
- 2
- Number of minimum-cardinality disabling domain sets
- 3
- First 20 minimum disabling domain sets
- acct1|site1; site1|site2; acct1|acct2
- Surviving copies after each single-domain failure
- acct1: 1; site1: 1; site2: 2; acct2: 2
- Smallest surviving-copy count after one named-domain failure
- 1
Try another scenario
- Backup copies: ID, domains whose failure disables that copy, joined by |
- A,acct1|site1 B,acct1|site2 C,acct1|site1
- Minimum named-domain failures disabling every supplied copy
- 1
- Number of minimum-cardinality disabling domain sets
- 1
- First 20 minimum disabling domain sets
- acct1
- Surviving copies after each single-domain failure
- acct1: 0; site1: 1; site2: 2
- Smallest surviving-copy count after one named-domain failure
- 0
Calculation method
Calculation method
Minimum named-domain failures disabling every supplied copy
Enumerate all subsets of at most 12 named domains; each copy fails if any of its listed domains fails.
Number of minimum-cardinality disabling domain sets
Count all disabling sets with that minimum number of domains.
First 20 minimum disabling domain sets
Show the first 20 in subset-enumeration order, explicitly not a complete list when count exceeds 20.
Surviving copies after each single-domain failure
Count copies not depending on the failed domain.
Smallest surviving-copy count after one named-domain failure
Minimum survivor count across supplied single-domain scenarios.
Symbols and units
- a
- Backup copies: ID, domains whose failure disables that copy, joined by |
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions & limits
Assumptions & limits
- An exact bounded shared-failure-domain inventory model. Each domain is assumed to disable all listed dependent copies; unlisted key, identity, storage and restore dependencies are invisible. No backup isolation or recovery assurance is certified.
Are these inputs private?
These calculations run in your browser. A shared link contains the values you choose to share. Only questions submitted to the separate AI finder are sent to OpenAI.
Further reading
Background reading; this does not imply endorsement or independent review of SumFizz.