If you are going to R81 or R81.10 you will have to move the MDS server to R81/R81.10. It happens that Check Point backports the capability of managing newer versions using older management installations but currently R80.30 only have the capability of managing R80.40 gateways. It was added with Jumbo Hotfix Take 166 and Smart Console Build 62.
R80.30 Jumbo HotFix - Ongoing Take 166 (11 March 2020)
PRJ-9461 Security Management NEW: Added ability for R80.30 Security Management or Multi-Domain Server to manage R80.40 Security gateway. Refer to sk164652.
Requires R80.30 SmartConsole Build 62 (or higher).
One must also remember that managing newer versions on gateways using an older version on the management installation often results in a lot of the new features not becoming available. Most new features require that both the management and the gateway is running the new version so not upgrading the management defeats the purpose.
So in your scenario when moving to R81 or R81.10 on the gateways you will have to move the MDS as well. The recommendation when moving the management is to do an "advanced upgrade". This means you take a copy of the running Gaia configuration, and a export of the management database using the new upgrade tools ($MDS_FWDIR/scripts/migrate_server) and import them on a fresh installation of R81/R81.10.
You can find all the steps detailed within the install and upgrade guide:
https://sc1.checkpoint.com/documents/R81.10/WebAdminGuides/EN/CP_R81.10_Installation_and_Upgrade_Gui...
I'm not sure how your MDS got moved to R80.30? You have to utilise the advanced upgrade option in order to get the new XFS filesystem that was introduced along with 3.10 kernel for management installations on R80.20+. You can verify this by the following commands via console/SSH in expert mode:
cat /etc/fstab
df -hT
And verify if your partitions are EXT3 (old) or XFS (new).
Certifications: CCSA, CCSE, CCSM, CCSM ELITE, CCTA, CCTE, CCVS, CCME