Re: NetBSD file system chat
Mike Cheponis <[email protected]>
| Newsgroups | gmane.os.netbsd.devel.general |
|---|---|
| Message-ID | <[email protected]> |
On Wed, 13 Jul 2005, James Buchanan wrote: > Since we can't know the physical disk geometry on modern disks, I don't believe this is true. If one were willing to measure transfer rates for a variety of sectors, I suspect an exact map of the disk could be determined. If the disk can tell you when it is re-mapping a sector, one could adjust the algorithm. I believe this uncertainty can be completely removed. > it doesn't > make a lot of sense to design a file system with knowledge of cylinder > boundaries or any other disk information. A new file system should probably > be a simple layout of extents of size x (probably page size, and configurable > at file system creation time). > Can a new file system somehow be implemented in userland first before adding > it into a kernel? Yes. Simulate it. > -- > James -Mike p.s. I have for years now advocated a tighter coupling between the VM and a huge FS. Others with less vision have tried to shoot me down. Well, I'm still here, and we still need tight VM/FS integration.