CUCM new filsystem EXT4 with version12.5

[rperon]

Hello,

I have a question about updating Unified Com applications (CUCM, CUC, IMP) to version 12.5.

In the precheck, it is indicated as follows:

If the previous two checks pass, the test checks if the server is using the ext3 filesystem and marks the test as
“WARN” with a recommendation to move to the ext4 filesystem.

My question is, is this filesystem changed automatically when upgrading to version 12, or is there a special action to be taken for the move to the ext4 filesystem?

I did not find any procedure on this change

[hardcoretech]

Why is no one answering this question??  Cisco???

[Roger Kallberg]

It happens automatically as part of the process of the upgrade. There is no need for any manual action on your end.

[PiotrAntoniuk]

The file system EXT3 is not changing to EXT4 during the upgrade!

[JaysonRCCL]

That wasn't correct.  It would have stay ext3 file system and not changed.  CUCM 15 no longer allows ext3, it requires a DRS backup, build new OVA and DRS Restore.  The newer installers will use ext4.  The pre-upgrade check for CUCM 15 will call this out in checks, but doesn't specifically say ext3 vs ext4, just that upgrade will fail.

[Roger Kallberg]

You’re right, thanks for pointing that out. Although the OP was asking about version 12.5, not 15, that’s unrelated to the question.

[JaysonRCCL]

Another option other then DRS for the ext3 to ext4 is to use the utils system upgrade dataexport initiate option as listed in the upgrade guides.  I think it is better then DRS as it doesn't require knowing the cluster database security password. 

[RockyManuel91335]

How did your upgrade to CUCM 12.5 go? i have the same warning in my pre upgrade check about moving to ext4 file system. did you have to do anything before the upgrade to address it?

[Roger Kallberg]

The conversion of the file system happens automatically as part of the process of the upgrade. There is no need for any manual action on your end.

[RockyManuel91335]

Thanks Roger.

[josephgrey4]

Hi Roger,
Does it matter if its a PCD upgrade or a Direct OS Admin upgrade?

[Roger Kallberg]

No. The changes to the file system happens regardless of how you upgrade.

[Daniel Bosch]

In theory.  I just ran preupgrade check on a 7 node CUCM cluster running v12.5.and only 1 node threw this warning.  Not sure how one server could upgrade to 12.5 and not get file system updated like all the rest.  This is the only hit I got regarding this warning, so posting just as heads up in case anyone else upgrading to v14 runs across this.  I'm opening a TAC case and suspecting I'll need to rebuild this one.  Hoping it's a false positive though...  Bizarre.

================================================================================
Pre Upgrade Test Date: 01/10/2023 22:41:56 UTC
================================================================================
Active Version: 12.5.1.12900-115
Server: ************** , CUCM Subscriber
================================================================================

Result Test
------ -------------------------------------------------------------------
1.1 WARN Filesystem Checks

*) This server is using an older filesystem type (ext3).
Recommend reinstall-and-restore or PCD Migration before upgrading to move
to newer/more efficient ext4 for increased performance and reliability.

[Daniel Bosch]

TAC advised that you can still upgrade to v14 on ext3 filesystem, but should plan to rebuild at some for optimal performance.