Network & Infrastructure
A cluster reports substantial total free capacity while individual OSDs approach fullness thresholds. Placement constraints can leave free space unusable for the affected data.
Storage Networks & Distributed Data1 นาทีในการอ่าน
อ่านบทความ : Near-full OSDs despite comfortable aggregate free space
Network & Infrastructure
A pool reports its configured replica count, yet multiple copies reside in the same rack-level power domain. Logical copy count can overstate resilience to a shared physical event.
Storage Networks & Distributed Data2 นาทีในการอ่าน
อ่านบทความ : CRUSH failure domains and replicas sharing one physical risk
Network & Infrastructure
A partition leaves some Ceph monitors reachable from clients but unable to form quorum. Mere process health or ping reachability does not establish that cluster control decisions can proceed.
Storage Networks & Distributed Data2 นาทีในการอ่าน
อ่านบทความ : Monitor quorum during a storage-network partition
Network & Infrastructure
An application loses I/O to part of a pool while the cluster dashboard highlights many health warnings. Inactive placement groups have a different service implication from merely degraded protection.
Storage Networks & Distributed Data2 นาทีในการอ่าน
อ่านบทความ : Inactive placement groups versus ordinary degraded redundancy
Network & Infrastructure
A fast pool cannot rebalance despite free disks elsewhere in the cluster. Its rule may intentionally limit placement to a device class whose own capacity is exhausted.
Storage Networks & Distributed Data2 นาทีในการอ่าน
อ่านบทความ : Device-class rules and capacity stranded in another tier
Network & Infrastructure
A client can contact cluster monitors but cannot perform useful I/O. The monitor path can work while required OSD addresses remain blocked or incorrectly routed.
Storage Networks & Distributed Data1 นาทีในการอ่าน
อ่านบทความ : Client-to-OSD reachability beyond the monitor endpoint
Network & Infrastructure
A server has two storage sessions but loses both during one switch reboot. Both logical paths may share the same physical NIC, switch or upstream power dependency.
Storage Networks & Distributed Data2 นาทีในการอ่าน
อ่านบทความ : Storage multipath independence beyond two logical sessions
Network & Infrastructure
A storage client pauses for longer than the network's link-failure detection time. TCP recovery and storage retry policies can extend the interruption after the network has converged.
Storage Networks & Distributed Data2 นาทีในการอ่าน
อ่านบทความ : Storage TCP retransmissions and application timeout budgets
Network & Infrastructure
A benchmark gains throughput with deeper queues, but production tail latency deteriorates when many clients use the same setting. Aggregate outstanding work exceeds the backend's useful concurrency.
Storage Networks & Distributed Data2 นาทีในการอ่าน
อ่านบทความ : Storage queue depth and latency under shared concurrency
Network & Infrastructure
A routine backup overlaps with a device failure and makes the remaining cluster unable to meet latency goals. Normal-day capacity planning omitted the combined failure workload.
Storage Networks & Distributed Data1 นาทีในการอ่าน
อ่านบทความ : Backup traffic that consumes storage recovery headroom
Network & Infrastructure
An erasure-coded pool has the expected shard count but still cannot tolerate the intended rack failure. Several required shards may share the same physical risk domain.
Storage Networks & Distributed Data2 นาทีในการอ่าน
อ่านบทความ : Erasure-coded placement and correlated shard loss
Network & Infrastructure
Logs appear to show recovery completing before a failure occurred. Clock offsets between clients, switches and storage nodes can make a plausible incident narrative causally wrong.
Storage Networks & Distributed Data1 นาทีในการอ่าน
อ่านบทความ : Storage incident timelines when hosts disagree on time