On Thu, Feb 11, 2016 at 4:29 PM, Blade Doyle <blade.doyle@xxxxxxxxx> wrote:
>
> After several months of use without needing any administration at all, I
> think I finally found something to debug.
>
> Attempting to "ls -l" within a directory on CephFS hangs - strace shows its
> hanging on lstat():
>
> open("/etc/group", O_RDONLY|O_CLOEXEC) = 4
> fstat(4, {st_mode=S_IFREG|0644, st_size=1190, ...}) = 0
> mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) =
> 0x7fc9f780b000
> read(4, "root:x:0:\nbin:x:1:bin,daemon\ndae"..., 4096) = 1190
> close(4) = 0
> munmap(0x7fc9f780b000, 4096) = 0
> lstat("sn0546_h264m_1280x720_1872.mp4",
>
>
> My cluster is healthy, except for the usual "4 requests are blocked > 32
> sec". I scanned the logs but don't find indication of an error.
>
> Where should I look next?
Dump the ops in flight on the client which is hanging, and on the MDS.
What are the 4 requests blocked and why is that usual?
-Greg
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