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ASM General Architecture

ASM General Architecture. Node1. Node2. Group Services tom=ant dick=ant harry=ant. Group Services tom=bee dick=bee harry=bee. DB Instance SID= sales. DB Instance SID= sales. DBW 0. ASMB. DBW 0. ASMB. ASM Instance SID=ant. ASM Instance SID=bee. RBAL. FG. FG. RBAL. FG.

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ASM General Architecture

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  1. ASM General Architecture Node1 Node2 Group Servicestom=ant dick=antharry=ant Group Services tom=bee dick=beeharry=bee DB Instance SID=sales DB Instance SID=sales DBW0 ASMB DBW0 ASMB ASM Instance SID=ant ASM Instance SID=bee RBAL FG FG RBAL FG FG ASMB ASMB RBAL RBAL DB Instance SID=test DB Instance SID=test DBW0 DBW0 ARB0 ARB0 … … RBAL RBAL ARBA ARBA ASM Disks ASM Disks ASM Disks ASM Disks ASM Disks ASM Disks ASM Diskgroup Tom ASM Diskgroup Dick ASM Diskgroup Harry

  2. Hierarchy ASMdisk group Database ASM file Data file Tablespace Segment ASM disk Extent File system file orraw device Allocation unit Oracleblock Physicalblock

  3. Failure Groups Controller 1 Controller 2 Controller 3 6 5 4 3 2 1 7 13 1 7 13 1 7 13 1 7 13 1 7 13 1 7 13 1 7 13 1 7 13 1 7 13 Failure group 1 Failure group 2 Failure group 3 Disk group A

  4. ASM Files CREATE TABLESPACE sample DATAFILE '+dgroupA'; Database File Automatic ASM filecreation 1 2 3 4 3 4 1 2 ASM file automatically spread inside disk group dgroupA

  5. RAC Software Storage Principles Node1 Noden Node1 Noden Instance1 … Instancen Instance1 … Instancen CRS home CRS home * * Oracle home Oracle home Local storage Local storage Local storage Local storage Voting file Voting file OCR file OCR file Shared storage CRS home Oracle home Shared storage Permits online patch upgrades Software not a singlepoint of failure

  6. OCR Architecture Node1 Node2 Node3 OCR Cache OCR Cache OCR Cache OCRprocess OCRprocess OCRprocess Clientprocess Clientprocess Shared storage OCRfile

  7. Data files Undo tablespacefiles forinstance1 Undo tablespacefiles forinstancen Temp files Control files Flash recovery area files Onlineredo log filesfor instance1 Onlineredo log filesfor instancen Change tracking file SPFILE RAC Database Storage Principles Node1 Noden … Instance1 Instancen Archivedlog files Archivedlog files Local storage Local storage Shared storage

  8. Typical Cluster Stack with RAC Servers Interconnect High-speed Interconnect Proprietary uDAPL or UDP Proprietary Oracle CRS OS C/W RAC Linux, UNIX, Windows RAC Linux Windows RAC Linux Windows RAC AIX, HP-UX, Solaris ASM OCFS RAW ASM RAW CFS OS CVM Database shared storage

  9. RAC and Services Application server ERP CRM Run time load balancing Service location transparency Service connections Listeners Connection load balancing Service availability aware Stop/Start service connections RAC Instances ERP ERP ERP ERP Modify service to instance mapping Backup Priority CRM CRM CRM CRM Alerts Tuning CRS Up and down events notification engine Restart failed components

  10. Virtual IP Addresses and RAC clnode-1 clnode-2 clnode-1vip clnode-2vip 2 2 Clients ERP=(DESCRIPTION= ((HOST=clusnode-1)) ((HOST=clusnode-2)) (SERVICE_NAME=ERP)) ERP=(DESCRIPTION= ((HOST=clusnode-1vip)) ((HOST=clusnode-2vip)) (SERVICE_NAME=ERP)) 4 1 5 1 6 6 7 Timeoutwait 5 7 3 3 clnode-2vip 4 clnode-1 clnode-2 clnode-1vip

  11. Managing OCR: Overview • The OCR content is critical to CRS. • The OCR is automatically backed up physically: • Every four hours: CRS keeps the last three • At the end of every day: CRS keeps the last two • At the end of every week: CRS keeps the last two • You can also: • Logically back up the OCR: • Copy physical OCR backups • Backups can be used for recovery purposes. ocrconfig –showbackup ocrconfig –backuploc ocrconfig -export

  12. Recovering the OCR 1. Locate either a physical or a logical backup. 2. Restart all the nodes in single-user mode. 3. Restore the physical OCR backup or import the logical OCR backup: 4. Restart all the nodes in multiuser mode. $ ocrconfig –restore \ > /app/oracle/product/10.1.0/crs_1/cdata/jfv_clus/day.ocr $ ocrconfig –import /u01/logical_ocr/yesterday

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