Cloud Resource policy changes 2019-05-14 00:00:00 - 2022-09-04 00:00:00
Stellar and Stellar Pro Cloud Resource policy
### CPU
CPU
For Central Processing Unit configuration in our cloud platform we use Dual AMD Epyc 7401 or 7401, Dual AMD Epyc 7352 or Single AMD Epyc 7401P** for each host node
The difference between v(irtual)CPU and d(edicated)CPU is in the core usage guarantee.
vCPU means maximum 100% of 1x AMD Epyc 7401 Core and minimum 50% 25% expressed by formula:
vCPU := 100% >= (1 x hostCPU) >= 50%
25%**
dCPU means 100% of dedicated 1x AMD Epyc 7401 Core expressed by formula:
pCPU dCPU := 1 x hostCPU**
hostCPU is 1 Physical Core of 1 (one) AMD Epyc 7401 processor
RAM
RAM
We use DDR4 ECC Registered RAM with at least 2666Mhz rate for all types of RAM allocation
There is no difference in RAM allocation for any plan due to nature of Virtualization.
vRAM or pRAM allocation
vMEM Memory is provided by virtual allocation with direct provision of used blocks of host physical RAM:
1MiB vRAM vMEM | 1MiB pRAM dMEM := 1MiB Dedup(1MiB hostRAM - zeroBytes
zeroBytes)**
dMEM Memory is provided by preallocation of host physical RAM:
1MiB dMEM := 1MiB hostRAM
hostRAM means physical system ram presented by hypervisor host system
zeroBytes means bytes not containing any data, means allocated data (allocated but empty memory pages
Both vRAM and pRAM are pages)
Dedup means data which is found in other hostRAM pages will not be duplicated but referenced
vMEM is virtually allocated on the host system and presented to the instance by reference through hypervisor.hypervisor.
dMEM is preallocated on the host system.
SPACE
SPACE
vNVME, vSSD or vHDD space imposes different limits in size, iops and bandwidth on the vBLOCK device.
In the plan listing we only specify the interface without specifying that it is a block device, because interface implies using a block device.
This means vBLOCK applies to any Stellar Cloud virtual plan and pBLOCK applies to any Stellar Cloud Pro dedicated plan:
vBLOCK Device space is provided by virtual allocation with direct provision of used blocks of host LVM volumes:
1MiB vBlock := 1MiB Dedup(1MiB hostBlock - zeroBytes
zeroBytes)**
pBLOCK Device space is provided by direct allocation of host LVM volumes:
1MiB pBlock := 1MiB hostBlock
_vBlock _vBLOCK devices = any interfaces prepended with vv
_pBlock
pBLOCK devices = any interfaces prepended with p
p_
Limits and QoS are imposed on all types of IO operations: Sequential Write, Sequential Read, Random Write, Random Read, Mixed.
Interfaces limits in detail:
vNVME := 1200000 >= IOPS >= 700
vNVME := 15000MB/s >= IOBW >= 75MB/s
vSSD := 120000 >= IOPS >= 100
vSSD := 2500MB/s >= IOBW >= 7MB/s
vHDD := 12000 >= IOPS >= 10
vHDD := 750MB/s >= IOBW >= 0.7MB/s
pNVME := 1200000 >= IOPS >= 1500
pNVME := 15000MB/s >= IOBW >= 155MB/s
pSSD := 120000 >= IOPS >= 250
pSSD := 2500MB/s >= IOBW >= 25MB/s
pHDD := 12000 >= IOPS >= 25
pHDD := 750MB/s >= IOBW >= 7MB/s
NVMe Devices used but not limited to Intel P4510.P4510, Micron 9300MAX.
SSD Devices used but not limited to Micron 1100.
HDD Devices used but not limited to Hitachi Ultrastar.
IOPS = input output operations per second
IOBW = input output bandwidth in MB/s
NETWORK
We use Dual 10Gbit/s bonding uplink bonding** uplink to each host node. This section describes only the virtualized devices and their share of uplink resources.
vNET := IF (NTB > 0) THEN (1Gbit/s (10Gbit/s duplex >= vBW >= 10Mbit/s duplex) ELSE (vBW = 10Mbit/s duplex)
pNET := 10Gbit/s duplex >= vBW >= NBW * 1Mbit/s duplex
vNET, pNET = virtual machine interface represented by tap device in virtualization host system
vBW = available bandwidth
NTB = amount of available traffic in TB
NBW = chosen network speed plan
Please note that:
Due to nature of internet transit and peering the bandwidth which leaves and reaches our network externally depends on transit and peering of other networks as well and provided with our highest quality effort. Before filing a Resource Policy Investigation Case (RPIC) please ensure that the problem occurs within our network and our upstream (Magyar Telekom) (ServerAstra AS56322) network. Tools like traceroute, mtr and ping will help you identify the issue and present us with a compelling case to escalate to network engineers.