Yes that would be a typical scenario. :) 发自我的 iPhone 在 2013-3-14，23:51，"Mark Nelson" <mark.nelson@xxxxxxxxxxx> 写道： > On 03/14/2013 10:44 AM, Greg Farnum wrote: >> On Thursday, March 14, 2013 at 8:20 AM, Sage Weil wrote: >>> On Thu, 14 Mar 2013, Huang, Xiwei wrote: >>>> Hi, all, >>>> I noticed that CephFS fails to support Direct IO for blocks larger than 8MB, say: >>>> sudo dd if=/dev/zero of=mnt/cephfs/foo bs=16M count=1 oflag=direct >>>> dd: writing `mnt/cephfs/foo: Bad address >>>> 1+0 records in >>>> 0+0 records out >>>> 0 bytes (0 B) copied, 0.213948 s, 0.0 kB/s >>>> My version Ceph is 0.56.1. >>>> ??I also found the bug has been already reported as Bug #2657. >>>> Is this fixed in the new 0.58 version? >>> >>> >>> >>> I'm pretty sure this is a problem on the kernel client side of things, not >>> the server side (which by default handles writes up to ~100MB or so). I >>> suspect it isn't terribly difficult to fix, but hasn't been prioritized... >>> >>> sage >> My guess too. Are direct IO writes of that size a common thing or of great import to you? >> Either way, a comment on the tracker saying you've run into it will promote it up when we're doing bug scrubs and backlog reviews. :) >> -Greg > > I imagine we'll see some applications doing large direct IO writes like this in the HPC space. > > Mark > >> >> -- >> 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 > ?韬{.n?????%??檩??w?{.n????u朕?Ф?塄}?财??j:+v?? ? ???2??璀??摺?囤??z夸z罐?+?????w棹f
