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
--
Kyle
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