Patent ID: 7743372

Claim:
A method, comprising: performing processing operations in a first logical partition in a first processing complex of a server cluster wherein said first logical partition operates using software code at a first level wherein the processing operations in the first logical partition include data input/output tasks directed to a storage system; updating software code in a second logical partition of said first processing complex from said first level to a second level while continuing to perform processing operations in the first logical partition; and performing processing operations in the second logical partition subsequent to said software updating in said second logical partition, wherein said second logical partition operates using software code at said second level and wherein the processing operations in the second logical partition include data input/output tasks directed to the storage system; and transferring partition resources from said first logical partition to said second logical partition while continuing to perform processing operations in the first logical partition, and performing processing operations in a third logical partition in a second processing complex of said server cluster wherein said third logical partition operates using software code at said first level; updating software code in a fourth logical partition of said second processing complex from said first level to said second level while continuing to perform processing operations in the third logical partition; and performing processing operations in the fourth logical partition subsequent to said software code at said second level.