Methods, devices and computer readable mediums for managing storage system

A system, comprising:

• a storage system including a disk array which includes at least one disk array group;
• computer-executable program logic encoded in memory of one or more computers enabled to manage storage,
• wherein the computer-executable program logic is configured for the execution of:
• in response to receiving a first message indicating that a failure occurs in a disk in the disk array, determining first information on a disk array group that the failed disk belongs to;
• obtaining a first number of outstanding input/output (I/O) operations on rebuilding the failed disk in the disk array group;
• determining, based on the first information and the first number, a threshold number of I/O operations that is applicable for the disk array group;
• and
• controlling, based on the threshold number, the number of I/O operations initiated to the disk array group;
• wherein controlling the number of I/O operations initiated to the disk array croup comprises:
• in response to receiving a request for a first I/O operation on the disk array group, determining a third number of outstanding I/O operations initiated to the disk array group;
• in response to the threshold number exceeding the third number, initiating to the disk array group at least part of first I/O operations;
• and
• in response to initiating the at least part of the first I/O operations, updating the threshold number.

A computer program product for managing a storage system, the storage system including a disk array which includes at least one disk array group, the computer program product comprising:

• a non-transitory computer readable medium encoded with computer executable code, the code configured to enable the execution of:
• in response to receiving a first message indicating that a failure occurs in a disk in the disk array, determining first information on a disk array group that the failed disk belongs to;
• obtaining a first number of outstanding input/output (I/O) operations on rebuilding the failed disk in the disk array group;
• determining, based on the first information and the first number, a threshold number of I/O operations that is applicable for the disk array group;
• and
• controlling, based on the threshold number, the number of I/O operations initiated to the disk array group;
• wherein controlling the number of I/O operations initiated to the disk array group comprises:
• in response to receiving a request for a first I/O operation on the disk array group, determining a third number of outstanding I/O operations initiated to the disk array group;
• in response to the threshold number exceeding the third number, initiating to the disk array group at least part of first I/O operations;
• and
• in response to initiating the at least part of the first I/O operations, updating the threshold number.