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Bandwidth between SYS hosts.


john_gb
21-11-2014, 07:10
Update:
An interesting phenomona is that if I test using UDP instead of TCP I get close to 1Gbs capacity! So it may be that SYS are actually only throttling TCP connections:

[ 4] 0.00-10.00 sec 1.12 GBytes 958 Mbits/sec 0.124 ms 0/158 (0%)
[ 4] Sent 158 datagrams

john_gb
21-11-2014, 03:35
Thanks, I decided that since there seems to be no definitive statement on the issue to run some tests using the network tool iperf3, and was disappointed to note that indeed even between two SYS hosts and never touching the internet, we do not see speeds exceeding 250Mbs. This may be that the connectivity between their RBX data centers is not that good (I have one server in each datacenter):

[ 4] local 94.23.33.214 port 34909 connected to 94.23.28.156 port 5201
[ ID] Interval Transfer Bandwidth Retr Cwnd
[ 4] 0.00-1.00 sec 29.3 MBytes 246 Mbits/sec 355 25.5 KBytes
[ 4] 1.00-2.00 sec 28.4 MBytes 238 Mbits/sec 361 24.0 KBytes
[ 4] 2.00-3.00 sec 28.3 MBytes 238 Mbits/sec 370 9.90 KBytes
[ 4] 3.00-4.00 sec 28.4 MBytes 238 Mbits/sec 294 7.07 KBytes
[ 4] 4.00-5.00 sec 28.5 MBytes 239 Mbits/sec 267 9.90 KBytes
[ 4] 5.00-6.00 sec 28.5 MBytes 239 Mbits/sec 353 25.5 KBytes
[ 4] 6.00-7.00 sec 28.5 MBytes 239 Mbits/sec 351 9.90 KBytes
[ 4] 7.00-8.00 sec 28.4 MBytes 239 Mbits/sec 428 15.6 KBytes
[ 4] 8.00-9.00 sec 28.3 MBytes 238 Mbits/sec 453 9.90 KBytes
[ 4] 9.00-10.00 sec 28.5 MBytes 239 Mbits/sec 332 8.48 KBytes
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval Transfer Bandwidth Retr
[ 4] 0.00-10.00 sec 285 MBytes 239 Mbits/sec 3564 sender
[ 4] 0.00-10.00 sec 285 MBytes 239 Mbits/sec receiver

I would be really interested in results if any of you could run the same test on two servers in SAME data center.

heise
20-11-2014, 09:01
It's only 250 Mbps garanteed, which does not mean you can't get full 1 Gbps speed. See http://forum.ovh.co.uk/showthread.ph...on-SyS-servers

john_gb
20-11-2014, 02:10
Does anyone know if the available bandwidth between SYS hosts is actually 1Gbs? or is it also only guarenteed to 250Mbs? It's an important consideration for me in a multi tier implementation on whether I can have two smaller boxes (1 app server 1 db server) or need to put them both on the same (but bigger) box.