| US 7,487,228 B1 | ||
| Metadata structures and related locking techniques to improve performance and scalability in a cluster file system | ||
| Kenneth Preslan, Minneapolis, Minn. (US); Michael J. Declerck, El Cerrito, Calif. (US); and Matthew O'Keefe, Plymouth, Minn. (US) | ||
| Assigned to Red Hat, Inc., Raleigh, N.C. (US) | ||
| Filed on Dec. 30, 2004, as Appl. No. 11/26,270. | ||
| Application 11/026270 is a continuation in part of application No. 10/355786, filed on Jan. 30, 2003, granted, now 7,406,473. | ||
| Int. Cl. G06F 13/00 (2006.01) | ||
| U.S. Cl. 709—219 [709/218; 709/225] | 2 Claims |
| 1. A file system distributed over a plurality of computers connected by a network, the plurality of computers executing user
programs, and the user programs accessing files stored on one or more physical disks connected to the plurality of computers,
comprising:
a plurality of disk servers operating as a single distributed disk server layer and connected to the one or more physical
disks, each disk server storing metadata for each of the files stored on the one or more disks;
a plurality of lock servers, having at least one or more read locks and one or more write locks for each file stored on the
one or more physical disks, said lock servers operating as a single distributed lock server to coordinate access to the files
stored by the disk server layer,
a plurality of asynchronous file servers, each having a memory, operating as a single distributed file server layer so that
in response to a request for a file from a user program, the file system is configured to maintain at least one quota file
and a quota change tag associated with a transaction, the at least one quota file configured to maintain quota values for
each identification number, wherein the quota change tag is accumulated in a journal and periodically updated to the at least
one quota file.
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