Virtual Datacentre and Storage Tier Specifications

This section is specific to CCL's vCloud service accessible via the vCloud PAYG tile in CloudCreator. 

Topics


Virtual Datacentre (vDC) Specifications

The table below describes the predefined vDC's that are available:

 

PAYG vGB Reservations

Unit

Unit Price

Reserved memory equal to...

20% VMs per vGB/hour powered on TBC

20% of its allocated value, with remaining memory available for bursting but not guaranteed

50% VMs     per vGB/hour powered on TBC

50% of its allocated value, with remaining memory available for bursting but not guaranteed

80% VMs  per vGB/hour powered on TBC

80% of its allocated value, with remaining memory available for bursting but not guaranteed.

100% VMs  per vGB/hour powered on TBC

100% of its allocated value, with remaining memory available for bursting but not guaranteed.


Storage Tiers

The table below describes the storage tiers.

 

Storage Tier Definition

T0 (Diamond)

 

 

Ideal for mission critical, response time sensitive, transactional workloads where sub 2.5ms response time is demanded. These are normally:

  • SQL / SAP / Relational DB
  • Exchange

These workloads are typically 90-100% random, with a 90/10 split between read/write.They are also prone to periods of 100% random writes when DB is refreshed or indexed.

T1 (Platinum)

 

Ideal for mission critical enterprise applications that require sub 10ms performance. They are tolerant of more latency for short periods of time.These are:

  • Relational DBs, eg.SQL/SAP.
  • Exchange
  • Data warehouses
  • Some App and print servers with high volumes of traffic.

These workloads are typically 70/30 random sequential and 70/30 read/write. They tend to be “peaky” and quite chatty during scheduled maintenance and backup windows. T1 is designed for these peaks.

T2 (Gold)

 

Ideal for departmental storage services. The response time dictates user experience not application stability.
These are:

  • Lower end print servers
  • Web servers
  • File servers

These workloads are generally under the 70/30 rule above. They are hard to define due to the broad nature of the ideal targets.

T3/T4

 

Archive storage only, where response time isn’t a business critical factor. These workloads are typically cryogenically cold. They get touched once a month/quarter/6 months/year, depending on the client's archive regime.

 

This tier is built on storable capacity not performance. Customers are strongly discouraged from using Tier 3 or 4 for boot devices.




 

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