At least in the past, there have been a couple of things you really want
to focus on regarding ARM and performance (beyond the obvious core
count/clockspeed/ipc/etc):
1) HW acceleration for things like CRC32, MD5, etc
2) context switching overhead
3) memory throughput
4) SATA controller and PCIe throughput
Unfortunately these are the kinds of things that you can't easily
generalize between ARM vs x86. Some ARM processors are going to do
wildly better than others. The good news is that driving 32 SATA drives
shouldn't be particularly CPU intensive (128 modern ARM cores is
probably sufficient) so the real question is probably what the SATA
controller setup looks like. I think you're best bet if you are serious
about pursuing the ARM route is try to get access to one of the Taishan
5280 servers and do some tests. You could try renting out an EC2 ARM
systems and play around there but I doubt it will be a very
apples->apples comparison.
Mark
On 11/24/20 6:12 AM, Adrian Nicolae wrote:
Hi guys,
I was looking at some Huawei ARM-based servers and the datasheets are
very interesting. The high CPU core numbers and the SoC architecture
should be ideal for a distributed storage like Ceph, at least in theory.
I'm planning to build a new Ceph cluster in the future and my best
case scenario right now is to buy 7 servers with 2 x Intel Silver
12-core or 2 x Gold 20-core CPUs, 32 SATA drives each. And of course -
SSDs/NVMEs for wal/db and the metadata pools , 256GB RAM and so on.
I'm curious however if the ARM servers are better or not for this use
case (object-storage only). For example, instead of using
2xSilver/Gold server, I can use a Taishan 5280 server with 2x Kungpen
920 ARM CPUs with up to 128 cores in total . So I can have twice as
many CPU cores (or even more) per server comparing with x86. Probably
the price is lower for the ARM servers as well.
Has anyone tested Ceph in such scenario ? Is the Ceph software
really optimised for the ARM architecture ? What do you think about
this ?
Thanks !
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