forked from spinesystemspublic/documentation
Denys Fedoryshchenko
66 lines
2.7 KiB
Markdown
66 lines
2.7 KiB
Markdown
## collectd
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### Forwarding collectd metrics to another collectd instance
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You need to add on destination collectd instance:
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```
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LoadPlugin network
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<Plugin network>
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<Listen "LISTENIP" "25826">
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SecurityLevel Encrypt
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AuthFile "/etc/collectd/passwd"
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</Listen>
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</Plugin>
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```
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In /etc/colllectd/passwd you need to add user and password for source collectd instance:
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```
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user:password
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user2:password2
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```
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Source collectd instance:
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```
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LoadPlugin network
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<Plugin network>
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<Server "DESTINATIONIP" "25826">
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SecurityLevel Encrypt
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Username "user"
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Password "password"
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</Server>
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</Plugin>
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```
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## Selecting right CPU, memory, disk, network card for your GlobalOS
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### CPU
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Find CPU available on cpubenchmark.net website and check "Average CPU mark".
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For PPPoE: You can estimate at 7000 points it might take about 4000 users. More points - more users, but growth is not linear.
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For example "Intel Xeon E3-1230 v3 @ 3.30GHz" has 6795 points.
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For NAT: You can estimate at 7000 points it might take about 10Gbps.
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Note, if you buy dual CPU server, you will not get 2x performance, it will be still significant boost, and you need to take into consideration, that each PCI-E is "local" for one CPU only, so you might need to install 2 network cards, on each CPU "side". Read about NUMA architecture and how it works.
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### Memory
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For PPPoE it is recommended to have at least 8GB of RAM at least. Recommended to have 16-32GB, but not more. You might take into consideration some servers with too much memory might have slower memory speed.
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Do not use DDR3 memory/servers, it is too slow, unless you are ok with lower than expected number of users per server.
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### Disk
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For our system it is totally fine to use USB drive, but internal SSD is preferable. System use very little of storage resources, not I/O bound, we know some USB flashes that lasted more than 6 years under 24/7 operation. Always keep nearby USB storage for backup/restore purposes.
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### Network card
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We highly recommend Intel network cards. Several generations exist:
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1) Well tested, but a bit old - X520, 82599 chipset (10Gbps), might have 1 or 2 SFP+ ports. Might accept any SFP+ modules.
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2) X7** series - 10Gbps/40Gbps, might have 1 or 2 SFP+ ports. Need to check compatibility with SFP+ modules, need Intel branded or modified firmware modules. Very high performance, but not tested extensively for PPPoE task.
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3) X9** series - 10Gbps/40Gbps, might have 1 or 2 SFP+ ports. Need to check compatibility with SFP+ modules, need Intel branded or modified firmware modules. Not tested yet.
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Not recommended: Broadcom, Chelsio cards, they are known to start packetloss way before 10Gbps.
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