Patent ID: 8583885

Claim:
A computer implemented method of managing data replication in a data replication system, the data replication system comprising a journal and a plurality of spindles configured into to store a plurality of Logic Units, each of which has a corresponding Logical Unit Number (LUN), comprising: selecting a LU using the corresponding LUN to store journal I/O data from the data replication, wherein the selected LU is configured to be a subset of the plurality of spindles; spinning down the spindles not configured to store the selected LU; wherein the replication system is enabled to spin down more than half of the spindles and the replication system is enabled to store IO directed to the spun down spindles on the subset of spindles; recording journal I/O on the selected LUN; determining to distribute the journal IO from the selected LU to the non-selected LUs; spinning up the spindles including the other LUs which were not selected; distributing the journal I/O from the selected LU to the other LUs.