Thanks a lot. Another question is: Do I have to run "e2fsck -y -D" on a file system to active "dir_index" feature? I have bunches of old ext3 file systems created with old versions of mkfs.ext3, then after upgraded to Fedora Core 5, I run "tune2fs -O dir_index" to have turned on the feature, but it is rumored that I have to run "e2fsck -y -D" after unmounting old ext3 file systems so that new file and directory creations will use hased B-tree. If that's corrct? If I don't run "e2fsck -y -D", then original linear directory structure will be still in effect even I turned on "dir_index" feature with tune2fs? For this case, what's the potential effects on the underlying old ext3 file systems? Thanks a lot. --- "Stephen C. Tweedie" <sct@xxxxxxxxxx> wrote: > Hi, > > On Tue, 2006-03-28 at 13:52 -0800, Robinson > Tiemuqinke wrote: > > > First, what's the "large_file" feature REALLY > means? > > Then, what's the size of "large file" to light > this > > feature on? 2GB, or 2TB? > > 2GB. > > > Second, the "ext_attr" feature seems another > > automatic one: it only appears after the first > > "setfacl" command runs on the file system and then > the > > feature will keep on there forever even ACL is > > removed. What's the indication of "ext_attr" > feature > > and what are the reasons behind to have this > feature? > > They are there simply to indicate that a given > feature is present on the > filesystem. They prevent old versions of the kernel > and/or e2fsck tools > from mistakenly operating on a filesystem with newer > features, > potentially corrupting things on disk or returning > incorrect file > contents. > > All remotely recent kernels have large file support > for ext3, and all > 2.6 ones (and many vendor-supplied 2.4 ones) have > ext_attr, so you have > to be running something pretty old to run into > compatibility problems > with either of those features. > > --Stephen > > > __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com
