Why ASM diskgroup (normal redundancy) is dismounted if all disks from one failgroup fail? (12102_gri

Hello

Why ASM diskgroup (normal redundancy) is dismounted if all disks from one failgroup fail? (12102_grid)

I created a diskgroup from command line or using asmca:

CREATE DISKGROUP disk_data NORMAL REDUNDANCY

  FAILGROUP storage1 DISK

    'ORCL:DATA1D1' NAME DATA1D1,

    'ORCL:DATA1D2' NAME DATA1D2

  FAILGROUP storage2 DISK

    'ORCL:DATA2D1' NAME DATA2D1,

    'ORCL:DATA2D2' NAME DATA2D2

where disks DATA1D1, DATA1D2 are shared using iSCSI from a linux host (storage1) and disks DATA2D1, DATA2D2 are shared using iSCSI from another linux host (storage2).

All the disks have the same size (40GB).