Re: [Moosefs-users] increase duplication level decrease performance

[Fyodor U. <uf...@uf...>]

On 04/04/2011 10:51 PM, Fyodor Ustinov wrote:
> Hi.
>
> ceph osd pool set data size 1
>
> dd if=/dev/zero of=aaa bs=1024000 count=4000
> 4096000000 bytes (4.1 GB) copied, 31.3153 s, 131 MB/s
>
> ceph osd pool set data size 2
> 4096000000 bytes (4.1 GB) copied, 72.7146 s, 56.3 MB/s
>
> ceph osd pool set data size 3
> 4096000000 bytes (4.1 GB) copied, 136.263 s, 30.1 MB/s
>
> Why? I thought increase in the number of copies should increase the 
> performance (in the worst case does not affect).
>
> WBR,
>    Fyodor.
Oops.
Not about moose :)
I'm test ceph and moosefs simultaneously/ this about ceph. :)

About moosefs - bonnie++ show dramatically slow on rewrite test.. :(