DragonFly kernel List (threaded) for 2008-05
Re: HAMMER update 05-May-2008
just wanted to check out HAMMER once again in a vkernel. But I kept
getting errors like:
# mount_hammer /dev/vkd1 /dev/vkd2 /mnt/
# cpdup /usr/ /mnt/
/mnt//bin: mkdir failed: Unknown error: 1711798680
/mnt//include/crypto/castsb.h rename-after-copy failed: No such file or directory
/mnt//include/c++/3.4/bits/stl_deque.h rename-after-copy failed: No such file or directory
/mnt//include/c++/3.4/algorithm rename-after-copy failed: No such file or directory
almost immediately. Later the vkernel crashed sometimes.
However, this only seems to happen with gcc34 compiled vkernels!
If I compile them with gcc 4.1.2 everything seems fine.
Is this expected?
Matthew Dillon <firstname.lastname@example.org> wrote:
> I am now working on the filesystem full handling. Everything else is
> working and appears to be stable.
> Current issues:
> * There may be a few undo cases where recovery-after-crash is
> unsuccessful, or results in an assertion later on. I found
> a big issue with the kernel itself trying to sync the buffers
> and I whacked that (the last thing HAMMER wants is for the kernel
> to sync its buffers!). I am continuing to test by intentionally
> crashing the system both under a vkernel and on real test boxes.
> * Reading and writing are not optimized well yet. For reading the issue
> is a lack of clustering and read-ahead support (yet). For writing
> the issue is due to the way buffers are staged out to the backend.
> Both issues are fairly straight forward, but they aren't high
> priority at the moment.
> * The filesystem full handling isn't in yet. That is next on my list.
> I have begun testing HAMMER on real hardware. My backup machine is now
> running a 700GB HAMMER filesystem. I expect more issues will work their
> way out of the woodwork but right now things are looking *very* good.
> Matthew Dillon