Oracle racle ASM Dynamic Volume Manager

 ASM instance can have many background processes.  All the required database's background processes are existed in the ASM instance like ARC, CKPT, LGWR, PMON, SMON, DBWn, etc..  Additionally, below are the list of ASM primary processes


ps -ef |egrep "rbal|mark|gmon|arb|onnn|pz|vdbg|vbg|vmb"
oracle   21913     1  0 15:16 ?        00:00:00 asm_rbal_+ASM1
oracle   21915     1  0 15:16 ?        00:00:00 asm_gmon_+ASM1
oracle   22439     1  0 15:17 ?        00:00:00 ora_rbal_OLTP1
oracle   22451     1  0 15:17 ?        00:00:00 ora_mark_OLTP1
oracle   22511     1  0 15:17 ?        00:00:00 ora_rbal_BRIO1
oracle   22525     1  0 15:17 ?        00:00:00 ora_mark_BRIO1
oracle   22729     1  0 15:17 ?        00:00:00 ora_pz99_OLTP1
oracle   22755     1  0 15:17 ?        00:00:00 asm_vbg0_+ASM1
oracle   22783     1  0 15:17 ?        00:00:00 asm_vdbg_+ASM1
oracle   22785     1  0 15:17 ?        00:00:00 asm_vmb0_+ASM1
oracle   22841     1  0 15:17 ?        00:00:00 ora_pz99_BRIO1
oracle   22977     1  0 15:18 ?        00:00:00 asm_vbg1_+ASM1
oracle   22979     1  0 15:18 ?        00:00:00 asm_vbg2_+ASM1

rbal:  rebalance activities

arbn:  Slave - rebalance activity

gmon:  Manage disk-level activities

mark: Marks ASM aollocation units as stale when needed

pz:  Parallel Slave


asm_vdbg_+ASM1:  Volume driver background.  It's a fatal background process that can bring down ASM instance.  It forwards ASM requests to lock or unlock an extent for volume operations to the dynamic volume manager. 


asm_vbg1_+ASM1:  Volume background process waits for requests from the dynamic volume manager.



asm_vmb0_+ASM1: Volume membership cordinates cluster member with ASM instance