How to change redundancy type from NORMAL to EXTERNAL without downtime?

Nov 29, 2018 10:50AM

We will change our storage from disks to flash storage in near future.

Our current ASM diskgroups are use NORMAL REDUNDANCY and each disk we use 400GB per LUN.

Our storage admin require to use bigger LUN (like 800GB or 1TB per LUN) when we switch to use flash storage.

I am thinking the process to complete the above tasks.

I can use 'ALTER DISKGROUP <dg_name> ADD DISK <..> DROP DISK <...>' to switch old hard disks to new flash storage without downtime.

But how to change redundancy mode without downtime or a acceptable (30-60 minutes) downtime?

1. Create a new diskgroup (example: FLASH01) with EXTERNAL REDUNDANCY using these new flash disks.

Storage Management (ASM ACFS DNFS ODM) (MOSC)