Abstract: A method is used in managing data availability in storage systems. A request to write new data to a disk of a plurality of disks of a data storage system is received. The plurality of disks includes first and second parity areas. The first parity area includes first parity information and the second parity area includes second parity information. Up to two disks of the plurality of disks are having a problem. Old data of the disk is reconstructed in a memory of the data storage system. The reconstructed old data of the disk is written to a parity area. The parity area is selected from the first or second parity areas based on a configuration preference. The new data is written to the parity area.