ok. Thanks. Is there any documentation for ceph fs client arch as a reference if I'd like to look into this?
发自我的 iPhone
在 2013-3-14，23:23，"Sage Weil" <sage@xxxxxxxxxxx> 写道：
> 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
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