When a new client asked for assistance with updating AIX to a new Technology Level (TL) for their SAP Enterprise Portal LPAR, I suggested using multibos. This would provide an easy fallback plan, since multibos creates a standby instance of the Base Operating System within the existing root volume group (rootvg) disk. The client would be able to create a multibos standby instance first, then update the primary active instance using smitty update_all. In the unlikely event of having to revert ...

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