![]() ![]() The drive count on any given day over the period of observation will vary. New Backblaze Vaults come online every month new features like S3 compatibility rapidly increase demand migration replaces old, low capacity drives with new, higher capacity drives and sometimes there are cloned and temp drives in the mix. The reason for the difference is that Backblaze is constantly adding and subtracting drives. Using the drive count method, model BB007 had a failure rate of 0.93%. Let’s go back to our example in the previous paragraph. After all, wouldn’t it be easier to calculate the AFR as:ĪFR = (Drive Failures / Drive Count) * (366 / days in period of observation) * 100 Some of you may be wondering where “drive count” fits into this formula? It doesn’t, and that bothers some folks.
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