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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

Ceph Learning PG

Calculation formula for PG: Calculation formula for the entire cluster PG The calculation formula for PG in each pool: Total PGs = (TOTAL_NUMBER_OF_OSD *)/Max_replication_count/pool_count The result of the settlement is taken up to the

PG Setup and Planning

Calculating the PG Count formula for a single poolPoolpgcount= ((TARGETPGSPEROSD)? ( Osdnumber)? (datapercent)) /poolsizeParameter introduction name Description Notes Pool PG Count Number of PG

PG database table interface and data export

Export command- - 5432 - -- inserts-t human_info > D:\human_info_backup.sql testdbCommand descriptionPg_dump: is the backup command that comes with the PG database, and in the bin directory, all execution must be performed in the bin directory.- H:

Oracle migration to PG problem Collation __oracle

This post is transferred from Http://bbs.pgsqldb.com, and two posts are joined together. A lot of content is online search information, I just tidy up, there are missing places, welcome to add First Use tool (ORA2PG) to automatically

PG Database Data table exception hangs

The PG database is the PostgreSQL database.A few days ago in a Java project, the data table exception hangs for the PG database after running the Java program. And it appears on a computer, reloading the database is useless, the other computers can

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