NW 6.5 SP5 provides an option to upgrade volume layout:

I have an serve upgraded from NW 6.0 SP5 to NW 6.5 Sp5, trying
"/ZLSSUpgradeCurrentVolumeMediaFormat=ALL" reports this error:

VolumeMediaFormat upgrade for volume "SYS" failed. Status = 24847.

I found this information for status = 24847:

zERR_ZLSSPOOL_UPGRADE_POOL_FIRST: The ZLSS pool must be upgraded before the
operation can be performed.

But how to upgrade the pool?

Any help are welcome.