On Nov 22, 2011, Sage Weil <sage@xxxxxxxxxxxx> wrote: > On Tue, 22 Nov 2011, Christian Brunner wrote: >> - compression: I'm using lzo compression right now, as my CPUs in the >> OSD nodes where idle most of the time and it is improving throughput >> quite a bit. > The caveat here is that there is a corner case with inline extents and the > clone ioctl that isn't implemented. What happens when you trigger that case? Crash or corruption? I ask because I've been running with zlib compression, and I haven't noticed any problems along these lines, though I haven't got to a point in which I'm doing more than rsyncing whole trees into the filesystem yet. >> - nocluster (requires an additional btrfs patch from Alexandre): I was >> reading that he was able to reduce the excessive metadata overhead, >> but it is slower. Does anyone know more about it? > We haven't tried this. I've used it occasionally and temporarily, to rebalance metadata and bring btrfs (even with clustered allocation) back to a faster pace without umount. -- Alexandre Oliva, freedom fighter http://FSFLA.org/~lxoliva/ You must be the change you wish to see in the world. -- Gandhi Be Free! -- http://FSFLA.org/ FSF Latin America board member Free Software Evangelist Red Hat Brazil Compiler Engineer -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
