Muirhead and Saturnelli, LLC
Recovery processing for persistent file data cache to reduce data loss
Processing for a file system may include determining an inconsistency between a data log and inodes (index nodes) of the file system. Responsive to determining the inconsistency, recovery processing may be performed including first processing of the data log, second processing of the inodes of the file system, and third processing of the data log after said second processing. First processing may, for each entry of the data log that records a create snapshot operation to create a snapshot of a file having an associated inode of the file system that is a dirty snapshot inode, marking the associated inode as “snap validated”. Second processing may include freeing each dirty snapshot inode not marked as “snap validated”. Third processing may include freeing any entry of the data log where the entry references dirty snapshot inode freed by the second processing.
EMC IP Holding Company LLC
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inventional inventional inventional inventional
Yubing Yunfei Kamakshi Yaming Philippe
Wang Chen Viswanadha Kuang Armangau