On 2012-07-06, at 5:01 PM, Phillip Susi wrote: > Back in the days when dinosaurs walked the earth ( the '90s ), there was > a defragger for ext2 written by Stephen Tweedie with contributions from > others including Ted Ts'o. After many years of abandonment and bit rot, > I have decided to take over maintainership of the package. I now feel > that it is in good enough of a state for a wider audience ( including > working with extents and other ext4 features ), so I am announcing it > here and asking for testing. The project page is > http://launchpad.net/e2defrag. > > The program opens an unmounted block device and parses the filesystem > itself, assigns new locations for all blocks, packing them to the left > within their native block group if possible, then moves all the blocks > around quickly and efficiently. The process it fast, but unsafe: should > anything go wrong or the process be interrupted, your fs will be toast. I hate to rain on your parade, but, are you aware of e4defrag? It is already in e2fsprogs, and can be used on a mounted ext4 filesystem... It also needs some lovin' to make it really robust, but would definitely be a better starting point than the ancient e2defrag code... That's why it is always a good idea to post to the mailing list _before_ you start on a project, to see what else is going on... Definitely there is a need for such a tool, but I hate to see effort being spent in two different directions to make two so-so tools, when it could be going in the same direction to make one excellent tool. Cheers, Andreas > Therefore: > DO NOT USE ON A FS YOU CARE ABOUT AND/OR HAVE NOT BACKED UP FIRST > > Should a bug cause it to trash your fs, a raw e2image ( e2image -r > /dev/sda1 - | bzip2 -c > sda1.e2i.bz2 ) made before the defrag, and > obviously saved on another fs, would be most helpful in debugging. > > One of the more interesting features is the ability to pass a list of > inodes to be given priority over others. This can be used to pack a set > of files together at the start of the disk to allow for faster booting. > I cobbled together a simple python script, dump2inodes, that can obtain > the list of files that ureadahead ( Ubuntu ) loads during boot and > generates the inode priority listing you can pass to e2defrag, and this > gives some nice boot time improvements. > > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.11 (GNU/Linux) > Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ > > iQEcBAEBAgAGBQJP9243AAoJEJrBOlT6nu75GPAIAJuZ7IiBH1YinJXFTil+R6z9 > EtLI4lZkHeWUGbVr/CnhV9l1iYIVo/aqPCBo4yH0efFGPSxF9z/KN8zIEvqs3Q30 > nDe1dNACyvkeIfzyP7wkFxuqK7hX7wkF+cIYT24MftTGTfaXssnoJ5bGd9TyJ0+s > 8fNM/Erq4saRBnq4aty/Q3FsAF9sc4ke5042FHNSM+xCFfHjZcsciTdPZP5svAcH > 8crQFmR9ieDIbn1M54mWWp3hYTd368ScJSoiM+K+d8ofbrXRSapJ9bSvuhLjvoxE > Tx7QXFdHoJb+Id4yf6xI/OZjg9egPW6otkPWwUJfAIE2Wh2AAfnAsGNg4QA86Ws= > =PK87 > -----END PGP SIGNATURE----- > -- > To unsubscribe from this list: send the line "unsubscribe linux-ext4" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html Cheers, Andreas
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