On Thursday 06 March 2008 11:28:31 am Keith Lofstrom wrote: > On Thu, Mar 06, 2008 at 09:33:52AM -0700, Shawn (Red Mop) wrote: > > Tar is actually very fast. I used it to split a bank about a month ago. > > It was a little unnerving, so I ran rsync -aH on top of (after) tar, and > > rsync did almost nothing. The du -hcs * in each vault already matched. > > "Almost nothing", unfortunately, can be a big difference. When I was > testing, tar did not produce bootable images, because some of the special > files did not copy. Perhaps it has been improved. rsync does produce > bootable images (if it did not, then dirvish wouldn't be very useful). > > My point is that these file copy tools can take a surprisingly long > time. My 500GB backup drive is now about 70% full, with about 100 > images on it (I do not expire them), meaning that to some tools, on > the file level, the drive appears to contain around 60 terabytes. > A drive copy at the file level will attempt to traverse a large > fraction of that 60TB; if the interface is running at 20MB/sec > that will take a large fraction of 800 hours. Yikes! > > > LVM + resize2fs is one of my very best friends. I grow and shring > > partions all the time. It's a real kick to move a partition from one > > disk to another while the partition is in use without rebooting, or even > > taking the partition offline. > > Yes, fine tools. I wish resize2fs had an extra option for increasing > or decreasing inode *density*. It does add or subtract inodes as you > grow or shrink partitions, maintaining the ratio of inodes to data, > but sometimes the problem is a lack or surplus of inodes. "Plan > ahead" is not always possible or easy with heavily hard-linked file > systems with unpredictable future usage. > > Is there a tool that permits the manipulation of inode density on > a used file system? > > Keith
I was worried about booting too. Thus, I did run rsync after. It did run faster running tar then rsync over just rsync. Perhaps I should have added that. _______________________________________________ Dirvish mailing list [email protected] http://www.dirvish.org/mailman/listinfo/dirvish
