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Curious if anyone knows how they calculate drive days. For example the first drive on their report (hgst 4tb) has a count of 50 but total days of 23069. If I
by humantiy 8y ago
Curious if anyone knows how they calculate drive days. For example the first drive on their report (hgst 4tb) has a count of 50 but total days of 23069. If I take the 50 by the days it should be 18250, so not sure where the extra 4k in days is coming from. Retired drives or something?
- tzs 8y agoI think it is over the time they have had the drive, not over the reporting interval. It's a measure of the age of the drives. Assuming their drives are operating 24/7, that means that those particular 50 drives have been in service an average of 461 days. I'd expect on next year's report, those particular drives will show up as 49 drives with around 42000 drive days, assuming they aren't replaced by then.
- humantiy 8y agoIf that is the case then wouldn't the Annualized Failure Rate be based of the year total not the drive days if it is total days in service? For example the drive count(50)/drive days(23,236) gives the AFR of 1.58% which equals out their numbers. The drive days is more than the total amount possible for that year.