Try running "mkfs.xfs -K" which disables discarding to see if that
improves the mkfs speed. The librbd-based implementation encountered a
similar issue before when certain OSs sent very small discard extents
for very large disks.
On Sun, Oct 29, 2017 at 10:16 AM, shadow_lin <shadow_lin@xxxxxxx> wrote:
> Hi all,
> I am testing ec pool backed rbd image performace and found that it takes a
> very long time to format the rbd image by mkfs.
> I created a 5TB image and mounted it on the client(ubuntu 16.04 with 4.12
> kernel) and use mkfs.ext4 and mkfs.xfs to format it.
> It takes hours to finish the format and the load on some osds are high and I
> can get slow request warning from time to time.
>
> What is a reasonable time to format a 5TB rbd image?What should I do to
> improve it?
> Thanks
>
> 2017-10-29
> ________________________________
> Frank
>
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>
--
Jason
