Hi Kyle, It would be great if you could share how you invoked the tool. I'm tempting to play with it and an example would help a great deal :-) Cheers On 20/12/2013 22:37, Kyle Bader wrote: > Using your data as inputs to in the Ceph reliability calculator [1] > results in the following: > > Disk Modeling Parameters > size: 3TiB > FIT rate: 826 (MTBF = 138.1 years) > NRE rate: 1.0E-16 > RAID parameters > replace: 6 hours > recovery rate: 500MiB/s (100 minutes) > NRE model: fail > object size: 4MiB > > Column legends > 1 storage unit/configuration being modeled > 2 probability of object survival (per 1 years) > 3 probability of loss due to site failures (per 1 years) > 4 probability of loss due to drive failures (per 1 years) > 5 probability of loss due to NREs during recovery (per 1 years) > 6 probability of loss due to replication failure (per 1 years) > 7 expected data loss per Petabyte (per 1 years) > > storage durability PL(site) PL(copies) > PL(NRE) PL(rep) loss/PiB > ---------- ---------- ---------- ---------- > ---------- ---------- ---------- > RAID-6: 9+2 6-nines 0.000e+00 2.763e-10 > 0.000011% 0.000e+00 9.317e+07 > > > Disk Modeling Parameters > size: 3TiB > FIT rate: 826 (MTBF = 138.1 years) > NRE rate: 1.0E-16 > RADOS parameters > auto mark-out: 10 minutes > recovery rate: 50MiB/s (40 seconds/drive) > osd fullness: 75% > declustering: 1100 PG/OSD > NRE model: fail > object size: 4MB > stripe length: 1100 > > Column legends > 1 storage unit/configuration being modeled > 2 probability of object survival (per 1 years) > 3 probability of loss due to site failures (per 1 years) > 4 probability of loss due to drive failures (per 1 years) > 5 probability of loss due to NREs during recovery (per 1 years) > 6 probability of loss due to replication failure (per 1 years) > 7 expected data loss per Petabyte (per 1 years) > > storage durability PL(site) PL(copies) > PL(NRE) PL(rep) loss/PiB > ---------- ---------- ---------- ---------- > ---------- ---------- ---------- > RADOS: 3 cp 10-nines 0.000e+00 5.232e-08 > 0.000116% 0.000e+00 6.486e+03 > > [1] https://github.com/ceph/ceph-tools/tree/master/models/reliability > -- Loïc Dachary, Artisan Logiciel Libre
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