phil@sequent.UUCP (11/02/83)
4.2 BSD dump/restore (yes "restore") do not quite totally operate through the filesystem. Dumping is still done though the device (usually raw for speed) but restores are done *only* on mounted filesytems and relative to the current directory. The biggest change is the added "i" flag to restore that is interactive! It puts you into a pseudo editor interface that lets you skip around selecting files to restore. It has to be seen to be believed. The 4.2 filesytem make a tremendous difference in dump/restore times since the tape runs at nearly tape speeds. The only unfortunate side effect of doing a restore through the filesytem is that the "ctime" of an inode cannot be set to the ctime of the tape file (as old restor did). One can certainly argue which is correct. -- Phil Hochstetler (503) 627-9811 Sequent Computer Systems ...!sequent!phil
msc@qubix.UUCP (Mark Callow) (11/07/83)
The new 4.2 dump/restore programs do all their stuff through the normal block device interface and no longer do the inode mapping. The "changes in 4.2" document (I think. I don't have it handy at home to check it is THE one) in discussing this says that it makes the dump tolerant of changes in the file system during the dump and implies that dumping of active file systems is safe. -- Mark Callow, Saratoga, CA. ...{decvax,ucbvax,ihnp4}!decwrl! ...{ittvax,amd70}!qubix!msc decwrl!qubix!msc@Berkeley.ARPA