Hi,
These numbers are probably not as detailed as you'd like, but it's
something. They show the overhead of reading and/or writing to EC pools
as compared to 3x replicated pools using 1, 2, 8 and 16 threads (single
client):
Rep EC Diff Slowdown
IOPS IOPS
Read
1 23,325 22,052 -5.46% 1.06
2 27,261 27,147 -0.42% 1.00
8 27,151 27,127 -0.09% 1.00
16 26,793 26,728 -0.24% 1.00
Write
1 19,444 5,708 -70.64% 3.41
2 23,902 5,395 -77.43% 4.43
8 23,912 5,641 -76.41% 4.24
16 24,587 5,643 -77.05% 4.36
RW
1 20,379 11,166 -45.21% 1.83
2 34,246 9,525 -72.19% 3.60
8 33,195 9,300 -71.98% 3.57
16 31,641 9,762 -69.15% 3.24
This is on an all-SSD cluster, with 3 OSD nodes and Bluestore. Ceph
version 12.1.0-671-g2c11b88d14
(2c11b88d14e64bf60c0556c6a4ec8c9eda36ff6a) luminous (rc).
Mohamad
On 09/06/2017 01:28 AM, Blair Bethwaite wrote:
> Hi all,
>
> (Sorry if this shows up twice - I got auto-unsubscribed and so first
> attempt was blocked)
>
> I'm keen to read up on some performance comparisons for replication
> versus EC on HDD+SSD based setups. So far the only recent thing I've
> found is Sage's Vault17 slides [1], which have a single slide showing
> 3X / EC42 / EC51 for Kraken. I guess there is probably some of this
> data to be found in the performance meeting threads, but it's hard to
> know the currency of those (typically master or wip branch tests) with
> respect to releases. Can anyone point out any other references or
> highlight something that's coming?
>
> I'm sure there are piles of operators and architects out there at the
> moment wondering how they could and should reconfigure their clusters
> once upgraded to Luminous. A couple of things going around in my head
> at the moment:
>
> * We want to get to having the bulk of our online storage in CephFS on
> EC pool/s...
> *-- is overwrite performance on EC acceptable for near-line NAS use-cases?
> *-- recovery implications (currently recovery on our Jewel RGW EC83
> pool is _way_ slower that 3X pools, what does this do to reliability?
> maybe split capacity into multiple pools if it helps to contain failure?)
>
> [1]
> https://www.slideshare.net/sageweil1/bluestore-a-new-storage-backend-for-ceph-one-year-in/37
>
> --
> Cheers,
> ~Blairo
>
>
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