that the total number of disks in Curve system is N, the number of replicas is R, and the data recovery Time in the case of failed disks is T. The Annual Failure Rate of disks is AFR, and the average 50 other disks will restore the data on that disk at the same time. According to this, the data recovery time T can be estimated. 𝐹𝐼𝑇 = 𝐴𝐹𝑅 24 ∗ 365 The probability of failure of disk within 𝑒"#$%∗('"!)∗(,7 ∗ 1 3 ∗ 50 𝑁 3 The probability of the failure of the third disk in tr during the recovery time is as follows𝑃- = 61 − 𝑒"#$%∗(' " ))∗(,7 ∗ 1 3 ∗ 50 ∗ 3 𝑁 The annual probability of

upgrads supported FULL LIFECYCLE Plan to Support app lifecycle, storage lifecycle(backup, failure, recovery) DEEP INSIGHTS Plan to Support metrics, alerts, log processing and workload analysis AUTO PILOT upgrade automation • Supporting Curve Cluster provisioning in helm chart • metadata backup and recovery • MDS / ChunkServer should respect failure domains of Kubernetes • Support for public cloud

1 (dynamic) Filesystem features: has_journal ext_attr resize_inode dir_index filetype needs_recovery extent 64bit flex_bg sparse_super large_file huge_file dir_nlink extra_isize metadata_csum Filesystem