On Fri, Jul 10, 2015 at 9:36 PM, Jan Pekař <jan.pekar@xxxxxxxxx> wrote:
> Hi all,
>
> I think I found a bug in cephfs kernel client.
> When I create directory in cephfs and set layout to
>
> ceph.dir.layout="stripe_unit=1073741824 stripe_count=1
> object_size=1073741824 pool=somepool"
>
> attepmts to write larger file will cause kernel hung or reboot.
> When I'm using cephfs client based on fuse, it works (but now I have some
> issues with fuse and concurrent writes too, but it is not this kind of
> problem).
Which kernel are you running? What do you see in the dmesg when it
hangs? What is the panic splat when it crashes? How big is the
"larger" file that you are trying to write?
>
> I think object_size and stripe_unit 1073741824 is max value, or can I set it
> higher?
>
> Default values "stripe_unit=4194304 stripe_count=1 object_size=4194304"
> works without problem on write.
>
> My goal was not to split file between osd's each 4MB of its size but save it
> in one piece.
This is generally not a very good idea - you have to consider the
distribution of objects across PGs and how your OSDs will be utilized.
Thanks,
Ilya
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