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Re: Ceph on btrfs 3.4rc



On Thu, May 03, 2012 at 08:17:43AM -0700, Josh Durgin wrote:
> On Thu, 3 May 2012 10:13:55 -0400, Josef Bacik <josef@xxxxxxxxxx>
> wrote:
> > On Fri, Apr 27, 2012 at 01:02:08PM +0200, Christian Brunner wrote:
> >> Am 24. April 2012 18:26 schrieb Sage Weil <sage@xxxxxxxxxxxx>:
> >> > On Tue, 24 Apr 2012, Josef Bacik wrote:
> >> >> On Fri, Apr 20, 2012 at 05:09:34PM +0200, Christian Brunner wrote:
> >> >> > After running ceph on XFS for some time, I decided to try btrfs again.
> >> >> > Performance with the current "for-linux-min" branch and big metadata
> >> >> > is much better. The only problem (?) I'm still seeing is a warning
> >> >> > that seems to occur from time to time:
> >> >
> >> > Actually, before you do that... we have a new tool,
> >> > test_filestore_workloadgen, that generates a ceph-osd-like workload on the
> >> > local file system.  It's a subset of what a full OSD might do, but if
> >> > we're lucky it will be sufficient to reproduce this issue.  Something like
> >> >
> >> >  test_filestore_workloadgen --osd-data /foo --osd-journal /bar
> >> >
> >> > will hopefully do the trick.
> >> >
> >> > Christian, maybe you can see if that is able to trigger this warning?
> >> > You'll need to pull it from the current master branch; it wasn't in the
> >> > last release.
> >>
> >> Trying to reproduce with test_filestore_workloadgen didn't work for
> >> me. So here are some instructions on how to reproduce with a minimal
> >> ceph setup.
> >>
> >> You will need a single system with two disks and a bit of memory.
> >>
> >> - Compile and install ceph (detailed instructions:
> >> http://ceph.newdream.net/docs/master/ops/install/mkcephfs/)
> >>
> >> - For the test setup I've used two tmpfs files as journal devices. To
> >> create these, do the following:
> >>
> >> # mkdir -p /ceph/temp
> >> # mount -t tmpfs tmpfs /ceph/temp
> >> # dd if=/dev/zero of=/ceph/temp/journal0 count=500 bs=1024k
> >> # dd if=/dev/zero of=/ceph/temp/journal1 count=500 bs=1024k
> >>
> >> - Now you should create and mount btrfs. Here is what I did:
> >>
> >> # mkfs.btrfs -l 64k -n 64k /dev/sda
> >> # mkfs.btrfs -l 64k -n 64k /dev/sdb
> >> # mkdir /ceph/osd.000
> >> # mkdir /ceph/osd.001
> >> # mount -o noatime,space_cache,inode_cache,autodefrag /dev/sda /ceph/osd.000
> >> # mount -o noatime,space_cache,inode_cache,autodefrag /dev/sdb /ceph/osd.001
> >>
> >> - Create /etc/ceph/ceph.conf similar to the attached ceph.conf. You
> >> will probably have to change the btrfs devices and the hostname
> >> (os39).
> >>
> >> - Create the ceph filesystems:
> >>
> >> # mkdir /ceph/mon
> >> # mkcephfs -a -c /etc/ceph/ceph.conf
> >>
> >> - Start ceph (e.g. "service ceph start")
> >>
> >> - Now you should be able to use ceph - "ceph -s" will tell you about
> >> the state of the ceph cluster.
> >>
> >> - "rbd create -size 100 testimg" will create an rbd image on the ceph cluster.
> >>
> > 
> > It's failing here
> > 
> > http://fpaste.org/e3BG/
> 
> 2012-05-03 10:11:28.818308 7fcb5a0ee700 -- 127.0.0.1:0/1003269 <==
> osd.1 127.0.0.1:6803/2379 3 ==== osd_op_reply(3 rbd_info [call] = -5
> (Input/output error)) v4 ==== 107+0+0 (3948821281 0 0) 0x7fcb380009a0
> con 0x1cad3e0
> 
> This is probably because the osd isn't finding the rbd class.
> Do you have 'rbd_cls.so' in /usr/lib64/rados-classes? Wherever
> rbd_cls.so is,
> try adding 'osd class dir = /path/to/rados-classes' to the [osd]
> section
> in your ceph.conf, and restarting the osds.
> 
> If you set 'debug osd = 10' you should see '_load_class rbd' in the osd
> log
> when you try to create an rbd image.
> 
> Autotools should be setting the default location correctly, but if
> you're
> running the osds in a chroot or something the path would be wrong.
> 

Yeah all that was in the right place, I rebooted and I magically stopped getting
that error, but now I'm getting this

http://fpaste.org/OE92/

with that ping thing repeating over and over.  Thanks,

Josef
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