Abstract: Techniques for handling highly amortized metadata page updates in storage clusters with delta log-based architectures. In response to performance of a transaction commit operation, bulk metadata pages are written in a transactional area of persistent memory in association with a unique transaction identifier. Further, raw delta updates to metadata pages and, for each bulk metadata page, a specialized flag, are written to a metadata delta log in association with the unique transaction ID. The specialized flag provides an indication that all delta updates that have occurred previous to the writing of a bulk metadata page are no longer relevant and should be dropped. The raw delta updates to metadata pages and specialized flags are updated in a volatile memory structure. The bulk metadata pages are flushed from the transactional buffer area directly to a metadata store of a storage array in a manner that bypasses the metadata delta log.

Abstract: Techniques for handling highly amortized metadata page updates in storage clusters with delta log-based architectures. In response to performance of a transaction commit operation, bulk metadata pages are written in a transactional area of persistent memory in association with a unique transaction identifier. Further, raw delta updates to metadata pages and, for each bulk metadata page, a specialized flag, are written to a metadata delta log in association with the unique transaction ID. The specialized flag provides an indication that all delta updates that have occurred previous to the writing of a bulk metadata page are no longer relevant and should be dropped. The raw delta updates to metadata pages and specialized flags are updated in a volatile memory structure. The bulk metadata pages are flushed from the transactional buffer area directly to a metadata store of a storage array in a manner that bypasses the metadata delta log.

Abstract: A method and a system for implementing a reverse directory lookup using hash table, the method comprising: calculating using a hash function, a hash value of file name, upon creating a new file in a file system; writing the calculated hash value to the metadata of the file; reading the hash value at a meta data of a file of a desirable identifier (ID), responsive to an inquiry of a file name associated with the desirable ID; and searching for a corresponding file name for the desirable ID at a bucket storing all files associated with this bucket according to their filename's hash values, based on a hash function.