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mglanville
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| With that warning in mind, this section is going calculate the probability of loss of media for various segment sizes. | ||
| We shall use a round number of 10 million hours of media. | ||
| We shall assume that the 10 million hours is total mono-essence media (i.e. separate audio and video Flows). | ||
| Note that we are using duration of media here, not amount of data, as durability the durability figure we are using is dependent on the number of Objects, not the size of them. |
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Is the word "durability" included multiple times here for redundancy? :P
mglanville
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Feb 23, 2026
| #### Worked examples | ||
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| > [!WARNING] | ||
| > This section is going to miss-use the above SLA durability value as if it is a genuine probability of Object loss. |
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AWS describes 11 nines durability as something that S3 is "designed" to provide. I don't think it's an SLA commitment in the conventional sense. I'm not sure about other cloud storage providers.
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Good spot. All three mention this figure using similar language. And all three link out to SLAs. But those SLAs don't seem to mention those figures themselves. I've removed "SLA" here.
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Details
This PR adds AppNote0021 which describes basic and advanced integrity models used in TAMS. The advanced model describes how checksums may be used for archived workflows.
Jira Issue (if relevant)
Jira URL: https://jira.dev.bbc.co.uk/browse/CLOUDFIT-5503
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