File Systems

The current FreeBSD Soft Updates poses to a performance peanlity when there’re plenty of i-nodes and this is very common case in badly-designed systems, however, I think this should be solved.

I have just tried to umount /usr on my test box in order to get all outstanding writes to be sync’ed to disk (as Kirk McKusick said, the umount system call will do true sync of a file system).

John Baldwin has committed a set of patches to Floppy disk generation and removed some legacy generation scripts. The new generation process makes use of splitfs, and there’s a drawback - All pieces of the splitted filesystem must be available when the fs is used.

A new MSDN article has said the following:

WinFS is the new storage system in Longhorn. It improves the Microsoft Windows platform in three ways. First, it allows you to categorize your information in multiple ways and relate one item of information to another. Second, it provides a common storage format for information collected on an everyday basis, such as information dealing with people, places, images, and more. Third, it promotes data sharing of common information across multiple applications from multiple vendors.

junsu昨天给了我一个perforce的URL: http://perforce.freebsd.org/chv.cgi?CH=45432

tjr写道: “Initial work on a new filesystem. Right now we can mount it, list
directories, and copy small files off it, but there is no write
support yet. This is going to be a simple extent-based filesystem,
borrowing ideas from NTFS and EFS.”

那么什么是extent呢？