Date: Mon, 2 Oct 2000 00:51:22 -0700 From: Guy Harris <gharris@flashcom.net> To: "Karsten W. Rohrbach" <karsten@rohrbach.de> Cc: freebsd-fs@FreeBSD.ORG Subject: Re: Journaling Filesystems in bsd? (LFS, anyone?) Message-ID: <20001002005122.C352@quadrajet.flashcom.com>
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> > There are three patents of which I'm aware. > could you be more specific, please? A search of IBM's Patent Womplex: http://patent.womplex.ibm.com/ for patents assigned to Network Appliance ("Advanced Text" search) found: US patent 5,819,292 "Method for maintaining consistent states of a file system and for creating user-accessible read-only copies of a file system"; US patent 5,963,962 "Write anywhere file-system layout"; US patent 6,038,570 "Method for allocating files in a file system integrated with a RAID disk sub-system" (which isn't a patent on WAFL by itself, it's a patent on the way we try to arrange to write as many blocks in a stripe as possible). (The other patents of ours it found are US 6,119,244 "Coordinating persistent status information with multiple file servers" (on our failover mechanism), US 5,950,225 "Fly-by XOR for generating parity for data gleaned from a bus" (on a hardware mechanism for doing RAID XORing while transferring data - we don't use that, though), and US 5,948,110 "Method for providing parity in a raid sub-system using non-volatile memory" (on recording in-progress RAID stripe writes in NVRAM so that, if the system dies in the middle of a stripe write, we don't have to scan the entire RAID group to make sure the parity block is correct in all stripes).) To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-fs" in the body of the message
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