Re: Ceph Performance MB/sec

[Gilles Mocellin <gilles.mocellin@xxxxxxxxxxxxxx>]

Le 01/12/2013 15:22, German Anders a écrit :

[...]
ceph@ceph-deploy01:/mnt/ceph-btrfs-test$ for i in 1 2 3 4; do sudo dd if=/dev/zero of=./a bs=1M count=1000; done

Hello,

You should really write anything but zeros.
I suspect that nothing is really written to disk, specially on btrfs, a cow filesystem with thin provisioning features.
Perhaps Ceph itself handle that like a sparse file.

Write a real file (iso image) or use a benchmark tool made for it, like fio.

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