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This was first published on https://blog.dbi-services.com/conversion-to-flex-asm-with-asmca-takes-5-minutes (2016-03-12)
Republishing here for new followers. The content is related to the the versions available at the publication date
In 12c Oracle recommands Flex ASM. You can opt for it at Grid Infrastructure installation, but it’s very easy to convert to it later from asmca. It has to configure
[grid@racp1vm1 ~]$ asmcmd showclustermode ASM cluster: Flex mode disabled
In ASMCA if you are not in Flex ASM then you have the button to convert to it from the first tab. A listener will run on each node, so you define the port and the interface:
On my laptop with the lab environment from the dbi services Grid Infrastructure / RAC training workshop running the converttoFlexASM.sh as root took 5 minutes.
When it’s finished, you restart asmca and see that the convert button is not there anymore:
you can see it from asmcmd as well:
[grid@racp1vm1 ~]$ asmcmd showclustermode ASM cluster : Flex mode enabled
I can shutdown the ASM instance on node 2 (not from node 1 as I’ve run asmca from it):
Both nodes have the flex ASM listener:
[grid@racp1vm1 ~]$ crsctl status resource -t
--------------------------------------------------------------------------------
Name Target State Server State details
--------------------------------------------------------------------------------
Local Resources
--------------------------------------------------------------------------------
ora.ASMNET1LSNR_ASM.lsnr
ONLINE ONLINE racp1vm1 STABLE
ONLINE ONLINE racp1vm2 STABLE
ora.CRS_DG.dg
ONLINE ONLINE racp1vm1 STABLE
OFFLINE OFFLINE racp1vm2 STABLE
ora.DATA.dg
ONLINE ONLINE racp1vm1 STABLE
OFFLINE OFFLINE racp1vm2 STABLE
ora.DATA2.MYACFSVOL.advm
ONLINE ONLINE racp1vm1 Volume device /dev/a
sm/myacfsvol-160 is
online,STABLE
ONLINE ONLINE racp1vm2 Volume device /dev/a
sm/myacfsvol-160 is
online,STABLE
ora.DATA2.dg
ONLINE ONLINE racp1vm1 STABLE
OFFLINE OFFLINE racp1vm2 STABLE
Note that the diskgroups are OFFLINE in node 2 because I stopped the ASM instance, but the ACFS filesystem is still up, thanks to flex ASM.