Today I saw that Postgres produces error messages related to possible data corruption (?). Everything's working as expected so I didn't realize anything was wrong.
ERROR: xlog flush request 6E/82FFED10 is not satisfied --- flushed only to 3D/CA02E920 CONTEXT: writing block 1008 of relation base/118517/118823 CONTEXT: writing block 1008 of relation base/118517/118823 WARNING: could not write block 1008 of base/118517/118823 LOG: request to flush past end of generated WAL; request 6E/82FFED10, currpos 3D/CA02E920 DETAIL: Multiple failures --- write error might be permanent.
PostgreSQL 11. Configuration:
max_connections = 100 shared_buffers = 16GB effective_cache_size = 48GB maintenance_work_mem = 2GB checkpoint_completion_target = 0.7 wal_buffers = 16MB default_statistics_target = 100 random_page_cost = 1.1 effective_io_concurrency = 200 work_mem = 41943kB min_wal_size = 1GB max_wal_size = 2GB max_worker_processes = 8 max_parallel_workers_per_gather = 4 max_parallel_workers = 8
pg_control version number: 1100 Catalog version number: 201809051 Database system identifier: 6775130872383000604 Database cluster state: in production pg_control last modified: Thu Mar 12 04:46:20 2020 Latest checkpoint location: 85/802C9268 Latest checkpoint's REDO location: 85/802C9230 Latest checkpoint's REDO WAL file: 000000010000008500000080 Latest checkpoint's TimeLineID: 1 Latest checkpoint's PrevTimeLineID: 1 Latest checkpoint's full_page_writes: on Latest checkpoint's NextXID: 0:69393025 Latest checkpoint's NextOID: 511846 Latest checkpoint's NextMultiXactId: 11365 Latest checkpoint's NextMultiOffset: 23069 Latest checkpoint's oldestXID: 562 Latest checkpoint's oldestXID's DB: 1 Latest checkpoint's oldestActiveXID: 69393025 Latest checkpoint's oldestMultiXid: 1 Latest checkpoint's oldestMulti's DB: 1 Latest checkpoint's oldestCommitTsXid:0 Latest checkpoint's newestCommitTsXid:0 Time of latest checkpoint: Thu Mar 12 04:45:50 2020 Fake LSN counter for unlogged rels: 0/1 Minimum recovery ending location: 0/0 Min recovery ending loc's timeline: 0 Backup start location: 0/0 Backup end location: 0/0 End-of-backup record required: no wal_level setting: replica wal_log_hints setting: off max_connections setting: 100 max_worker_processes setting: 8 max_prepared_xacts setting: 0 max_locks_per_xact setting: 64 track_commit_timestamp setting: off Maximum data alignment: 8 Database block size: 8192 Blocks per segment of large relation: 131072 WAL block size: 8192 Bytes per WAL segment: 16777216 Maximum length of identifiers: 64 Maximum columns in an index: 32 Maximum size of a TOAST chunk: 1996 Size of a large-object chunk: 2048 Date/time type storage: 64-bit integers Float4 argument passing: by value Float8 argument passing: by value Data page checksum version: 0 Mock authentication nonce: edec50c3ef6ee1a42351c2e593de539feb25343ad239e12b813b4c212ae2a1d6
I did a backup and then I restored it to another database and removed the old one. It didn't work. I still getting those errors.
P.S. PostgreSQL did not crash lately. There is also a plenty of space on SSD.