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Ceph Source code parsing: PG Peering

The device exception in the cluster (the addition and deletion of the exception OSD) can result in inconsistent data between the various copies of the PG, and data recovery is required so that all replicas are in a consistent state.First, the OSD

Ceph knowledge excerpt (Crush algorithm, PG/PGP)

Crush Algorithm1, the purpose of crushOptimize allocation data, efficiently reorganize data, flexibly constrain object copy placement, maximize data security when hardware fails2. ProcessIn the Ceph architecture, the Ceph client is directly read and

PHP implementation can be used to MYSQL,MSSQL,PG database operation class _php skills

This example describes the database operations classes available in MYSQL,MSSQL,PG three databases, and you can easily change the type of your database as long as you make any changes. Share it for your reference. The specific analysis is as follows:

PHP Database Operations Class (available MYSQL,MSSQL,PG)

-Function Manifest Index:-Open: Opening database connection line:71-Close: Closes the database connection line:107-SELECTDB: Select Database line:129-Query: Create queries line:151-Dataseek: Move record pointer line:175-FieldName: Get field name

ceph-Intelligent Distribution Crush object with PG and OSD

The Ceph Crush algorithm (controlled Replication under Scalablehashing) is an algorithm based on data distribution and replication for random control.Basic principle:Storage devices typically support stripe to increase storage system throughput and

PG Database Upgrade step description (Pg_dumpall and Pg_upgrade)

One, database upgrade 9.4 to 9.51.pg_dump Import and export (used when data volume is small)Postgres User Login$ pg_dumpall > Db_export.out$ env|grep LANGLang=en_us. UTF-8If the database character set is en_US. UTF-8, the system character set is

Import and export between PG databases

This article will introduce how to import and export the PG database, the main use is the PG comes with pg_dump, Pg_dumpall, Pg_restore, Psql and other commands, version is 9.4 (different versions of pg_dump \ Pg_ The restore option may be somewhat

PHP Generic paging class page. php [Imitation google paging] _ PHP Tutorial

PHP Generic paging class page. php [like google paging]. The copy code of page. php is as follows :? Php *** common php paging class. (Similar to Google style) ** you only need to provide two parameters: the total number of records and the number of

PHP Universal pagination Class code, imitation Goolge page style

/** * * Generic PHP paging class. (Imitation Google style) * * Simply provide two parameters for the total number of records and the number of displays per page. (Detailed usage instructions are attached.) * * No URL is specified and

Ceph Translations Rados:a Scalable, Reliable Storage Service for Petabyte-scale Storage Clusters

Rados:a scalable, Reliable Storage Service for Petabyte-scale Storage ClustersThesis translationSummaryBlock and object-oriented storage architectures form a storage cluster that promotes extensibility. However, existing systems continue to use

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