On 08/29/2012 01:50 AM, Alexandre DERUMIER wrote:
Nice results !
(can you make same benchmark from a qemu-kvm guest with virtio-driver ?
I have made some bench some month ago with stephan priebe, and we never be able to have more than 20000iops, with a full ssd 3nodes cluster)
How can I set the variables when the Journal data have go to the OSD ? (after X seconds and/or when Y %-full)
I think you can try to tune these values
filestore max sync interval = 30
filestore min sync interval = 29
filestore flusher = false
filestore queue max ops = 10000
Increasing filestore_op_threads might help as well.
----- Mail original -----
De: "Dieter Kasper" <d.kasper@xxxxxxxxxxxx>
À: ceph-devel@xxxxxxxxxxxxxxx
Cc: "Dieter Kasper (KD)" <d.kasper@xxxxxxxxxxxx>
Envoyé: Mardi 28 Août 2012 19:48:42
Objet: RBD performance - tuning hints
Hi,
on my 4-node system (SSD + 10GbE, see bench-config.txt for details)
I can observe a pretty nice rados bench performance
(see bench-rados.txt for details):
Bandwidth (MB/sec): 961.710
Max bandwidth (MB/sec): 1040
Min bandwidth (MB/sec): 772
Also the bandwidth performance generated with
fio --filename=/dev/rbd1 --direct=1 --rw=$io --bs=$bs --size=2G --iodepth=$threads --ioengine=libaio --runtime=60 --group_reporting --name=file1 --output=fio_${io}_${bs}_${threads}
.... is acceptable, e.g.
fio_write_4m_16 795 MB/s
fio_randwrite_8m_128 717 MB/s
fio_randwrite_8m_16 714 MB/s
fio_randwrite_2m_32 692 MB/s
But, the write IOPS seems to be limited around 19k ...
RBD 4M 64k (= optimal_io_size)
fio_randread_512_128 53286 55925
fio_randread_4k_128 51110 44382
fio_randread_8k_128 30854 29938
fio_randwrite_512_128 18888 2386
fio_randwrite_512_64 18844 2582
fio_randwrite_8k_64 17350 2445
(...)
fio_read_4k_128 10073 53151
fio_read_4k_64 9500 39757
fio_read_4k_32 9220 23650
(...)
fio_read_4k_16 9122 14322
fio_write_4k_128 2190 14306
fio_read_8k_32 706 13894
fio_write_4k_64 2197 12297
fio_write_8k_64 3563 11705
fio_write_8k_128 3444 11219
Any hints for tuning the IOPS (read and/or write) would be appreciated.
How can I set the variables when the Journal data have go to the OSD ? (after X seconds and/or when Y %-full)
Kind Regards,
-Dieter
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