Method, system, and program for destaging data in cache

A system for destaging data. comprising:

• a first computer readable medium;
• a second computer readable medium;
• means for scanning a cache list of entries indicating data blocks in the first computer readable medium;
• means for determining, for each entry scanned, whether the data block indicated in the scanned entry satisfies a criteria;
• means for calling for a destage operation to destage the data block in the scanned entry from the first computer readable medium to the second computer readable medium if the data block indicated in the scanned entry satisfies the criteria;
• means for removing the scanned entry from the cache list if the called destage operation is not initiated;
• means for adding the removed scanned entry to one destage wait list;
• and
• means for destaging data blocks indicated in entries in the destage wait list during one destage operation.

An article of manufacture including code for destaging data from a first computer readable medium to a second computer readable medium, wherein the code is capable of causing operations to be performed comprising:

• scanning a cache list of entries indicating data blocks in the first computer readable medium;
• for each entry scanned, determining whether the data block indicated in the scanned entry satisfies a criteria;
• if the data block indicated in the scanned entry satisfies the criteria, then calling for a destage operation to destage the data block in the scanned entry from the first computer readable medium to the second computer readable medium;
• if the called destage operation is not initiated, then removing the scanned entry from the cache list;
• adding the removed scanned entry to one destage wait list;
• and
• destaging data blocks indicated in entries in the destage wait list during one destage operation.