Oracle/HP Best Practices Guide for HP IO Accelerators

Redundancy architectures 8
• /dev/fiob to /dev/fiod
• /dev/fioe to /dev/fiog
• /dev/fiof to /dev/fioh
The following command mirrors four devices (fioa through fiod) to create the +DATADG disk group.
ASM SQL > CREATE DISKGROUP DATADG NORMAL REDUNDANCY
FAILGROUP failure_group_1 DISK
'/dev/fioa' NAME diska1,
'/dev/fiob' NAME diska2,
FAILGROUP failure_group_2 DISK
'/dev/fioc' NAME diskb1,
'/dev/fiod' NAME diskb2;
The following command mirrors across four devices (/dev/fioa[e,f,g, h]) to create the LOG-DG
disk group.
ASM SQL > CREATE DISKGROUP LOGDG NORMAL REDUNDANCY
FAILGROUP failure_group_1 DISK
'/dev/fioe' NAME diska1,
'/dev/fiof' NAME diska2,
FAILGROUP failure_group_2 DISK
'/dev/fiog' NAME diskb1,
'/dev/fioh' NAME diskb2;
High redundancy (mirroring/RAID 10+1)
ASM can also mirror data to three failure groups. This provides an additional level of redundancy above
the normal setting, allowing failure of up to two disks in different failure groups to be handled gracefully.
The effective disk space in a high-redundancy disk group is one-third the sum of the disk space in all the
devices.
The following command mirrors devices /dev/fio[a,c,e] and then mirrors devices
/dev/fio[b,d,f] and stripes across the resulting two mirrored volumes, creating the DATADG disk
group.
ASM SQL > CREATE DISKGROUP DATADG HIGH REDUNDANCY
FAILGROUP failure_group_1 DISK
'/dev/fioa' NAME diska1,
'/dev/fiob' NAME diska2,
FAILGROUP failure_group_2 DISK
'/dev/fioc' NAME diskb1,
'/dev/fiod' NAME diskb2,
FAILGROUP failure_group_3 DISK
'/dev/fioe' NAME diskc1,
'/dev/fiof' NAME diskc2;