This illustration shows two disks: disk A and disk B. Disk A contains two logs: A_LOG1 and A_LOG2. Disk B contains two logs: B_LOG1 and B_LOG2. The LGWR process writes to A_LOG1 and B_LOG1 simultaneously, then switches and writes to A_LOG2 and B_LOG2 simultaneously, then switches back and writes to A_LOG1 and B_LOG1 simultaneously, and so forth.