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 > > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > -- Jason _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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