You never know when a disaster can ruin your business plans and future, specially when your business data is stored in a Data Center or Colocation Center. Affirmation: If your customers are aware of the fact that their data will be safe in data center they will be happy to do business with you. If Disaster Strikes: You will be extremely happy to know that your data is safe with backup on online computers, when the data center is hit by a natural disaster. Savings: Yes that is true, bucks loosed while registering for a data center disaster recovering plan are much less than what you may loose if your data is destroyed in a natural disaster.
Potency: Potency of your work will be boosted with the help of computer backed systems as these systems will quickly restore the damaged and deleted files. So, next time when you are registering with Data Center services provider, make sure they have Data Center Disaster recovery plan to make sure your data is safe even in a natural disaster. This entry was posted in Data Centers India and tagged Colocation Services India, Data Center India, Fully Managed Data Center. Il disaster recovery rappresenta una forma di assicurazione per la protezione delle risorse IT in caso di eventi disastrosi.
One of the fundamental elements of Business Continuity Plan is Data Center Disaster Recovery. Data Center Disaster Recovery complexity is the measure of how difficult it would be to recover the database to a satisfactory level of service following a prolonged disruption or outage.
The best feature of Data Center Disaster Recovery Plan is that it will help you in numerous ways no matter the adversity strikes or not.
Given below is the list of Data Center Disaster Recovery Template Packages that can initiate your Data Center Disaster Recovery project.
Traditionally, providers deployed a dedicated infrastructure for each tenant that it hosted. Figure 2-1 represents how each tenant can be logically separated within the Cisco VMDC design. Path isolation defines independent, logical traffic paths over a shared physical network infrastructure.
The virtualized network consists of Layer 2 VLANs and Layer 3 VRFs to provide logical, end-to-end isolation across the network. The Cisco Data Center Services Node (DSN) is a Cisco Catalyst 6500 Series Switch with FWSM and ACE service modules dedicated to security and server load balancing functions. Using the virtualization features of the Cisco DSN services modules, you can create separate contexts that represent separate virtual devices. To address some of these new security challenges and concerns, we recommend deploying virtual firewalls at the access layer to create intra-tenant zones. To maintain tighter control and isolation, architects can map storage LUNs per VM using the raw disk map (RDM) filer system. If a three-tiered application architecture is needed, the tiers can be logically separated on different VLANS.
This document addresses the design aspects of the vApp firewalls but does not detail the vShield implementation. The Cisco VMDC architecture proposes VLAN separation as the first security perimeter in application tier separation.
At the access layer of the network, the vShield virtual appliance monitors and restricts inter-VM traffic within and among ESX hosts. A logical construct on the Nexus 1000V, called a virtual service domain (VSD), can classify and separate traffic for vApp-based network services, such as firewalls.
Private VLANs (PVLANs) can complement vFW functionality, effectively creating sub-zones to restrict traffic between VMs within the same VLAN. This type of distribution of firewall services and policy to the access layer increases scale in hyper-dense compute environments and leverages VMware cluster HA technology to enhance firewall service availability. To extend secure separation to the storage layer, we considered the isolation mechanisms available in a SAN environment.
SAN zoning can restrict visibility and connectivity between devices connected to a common Fibre Channel SAN. On the EMC Symmetrix V-Max storage array, key software features provide for the secure separation of SAN data. NFS servers often need to authenticate that the source of an NFS request is an authorized client system. The NetApp MultiStore software allows the creation of separate and private logical partitions on a single storage system. This formula provides a measurement of the percentage of time, for the period T (such as a month, a quarter, a year), in which the service was available to one's tenants. A managed security service is a general term for a number of possible services: these include VPNs (SSL, IPSec, MPLS), IPS, deep packet inspection, DDoS mitigation and compliance (file access auditing and data or datastore encryption) services.
In addition to the availability components in Table 2-2, service performance components can include incident response time and incident resolution objectives. Network availability is paramount to any organization running a virtualized data center service. The data center core is meant to be a high-speed Layer 3 transport for inter- and intra-datacenter traffic.
For example, if BFD with OSPF protocol is enabled between the pair of aggregation switches and a BFD neighbor session with its OSPF neighbor router goes down, BFD notifies the OSPF process that the BFD neighbor is no longer reachable. This VMDC 2.0 Compact Pod does not specify a core design as there are several ways it could be deployed.
High availability for the services layer can be achieved whether using appliances or the service chassis design.
If using appliances, high availability can be achieved by logically pairing two physical service devices together.
The same can be achieved using the service chassis design, but HA would also need to be implemented at the service chassis level.
Unified Computing System (UCS) fabric interconnect running in end host mode do not function like regular LAN switches.
When UCS Fabric Interconnects operate in End-Host Mode (as opposed to Switch Mode), the virtual machine NICs (VMNICs) are pinned to UCS fabric uplinks dynamically or statically.
The Cisco UCS system always load balances traffic for a given host interface on one of the two available fabrics. If an active physical link goes down, the Cisco Nexus 1000V Series Switch sends notification packets upstream of a surviving link to inform upstream switches of the new path required to reach these virtual machines.
Always deploy the Cisco Nexus 1000V Series VSM (virtual supervisor module) in pairs, where one VSM is defined as the primary module and the other as the secondary. Tools such as VMware's Site Recovery Manager, coupled with Cisco's Global Site Selection for DNS redirection and synchronous or asynchronous datastore replication solutions such as EMC's SRDF may be used to create automated recovery plans for critical groups of VMs.
In the storage layer, the design is consistent with the high availability model implemented at other layers in the infrastructure, which include physical and path redundancy. High availability within a FC fabric is easily attainable via the configuration of redundant paths and switches. When designing SAN booted architectures, considerations are made regarding the overall size and number of hops that an initiator would take before it is able to access its provisioned storage. Consolidating multiple areas of storage into a single physical fabric both increases storage utilization and reduces the administrative overhead associated with centralized storage management. Technology such as virtual SANs (VSANs) enables this consolidation while increasing the security and stability of Fibre Channel fabrics by logically isolating devices that are physically connected to the same set of switches. A PortChannel can be configured without restrictions to logically bundle physical links from any port on any Cisco MDS 9000 Family Fibre Channel Switching Modules. Pending the upcoming availability of FC port channels on UCS FC ports and FC Port Trunking, multiple individual FC links from the UCS 6120s are connected to each SAN fabric, and VSAN membership of each link is explicitly configured in the UCS. Viruses and Worms threats act as the biggest threat to these files, not only slowing your business but also affect the output quality. A Data center disaster recovery plan will not only help you to be loyal to your existing customers but it will also be helpful as a major selling point to new clients looking to expand their business. These backed systems are so quick that they barely five a chance to the customers to notice the change. Proprio come una polizza assicurativa efficace, il disaster recovery ideale deve garantire la massima protezione al minor costo e ridurre al minimo i problemi. The rising prevalence of disaster and insecure environment has made it indispensable for every organization to create standard security policy and procedures that comply with regulatory authorities. Complexity can be associated to availability of technology resources, infrastructure, platform requirements, telecommunications, equipment, and availability of trained personnel. The Data Recovery Plan helps you in creating proper backup system in place, provides immediate access to have files restored, highly confidential and critical data security, and helps in keeping the vast documentation database in order. This approach, while viable for a multi-tenant deployment model, does not scale well because of cost, complexity to manage, and inefficient use of resources. To define these paths, create VPNs using VRFs and map among various VPN technologies, Layer 2 segments, and transport circuits to provide end-to-end, isolated connectivity between various groups of users. Using this technique, each network device and all of its physical interconnections are virtualized. This effect results from VRF Lite per hop technique that requires every network device and its interconnections to be virtualized. These groups represent an additional level of segregation and security as no communication is allowed among devices belonging to different VRFs unless explicitly configured. Figure 2-3 shows how the VLANs defined on each access layer device for Gold network container are mapped to the same Gold VRF at the distribution layer.
To achieve secure separation across the network, the services layer must also be virtualized.


The Cisco VMDC solution uses the virtualization features of the Cisco FWSM and Cisco ACE modules to distribute traffic across both Catalyst chassis.
Additional VLANs are carried over the inter-switch link (ISL) to provide fault tolerance and state synchronization.
This high-density model forces us to reconsider firewall scale requirements at the aggregation layer.
Cisco UCS M81KR Virtual Interface Card (VIC) is a network interface consolidation solution. Using the Cisco VIC features, you can create virtual adapters and map them to unique virtual machines and VMkernal interfaces through the hypervisor. Security zones may be created based on VMware Infrastructure (VI) containers, such as clusters, VLANs, or at the VMware Datacenter level.
A vShield checks each traffic session against the top rule in the VM Wall table before moving down the subsequent rules in the table. When a rule is configured at the data center level, all clusters and vShield agents within the clusters inherit that rule.
In this example, the ESX cluster extends across two chassis of B200-M1 blade servers installed with M71KR-E mezzanine cards, and the VMs are in a single Nexus 1000V virtual switch. Define multiple groups of VSD policy zones and apply them to groups of servers for a specific tenant.
However, it also presents challenges: the need to scale policy management for larger numbers of enforcement points, and the fact that vApp-based firewalls are relatively new in terms of understanding and managing firewall performance. Separation occurs both at the switches and the storage arrays connected to the physical fabric. These features include true segmentation mechanisms that typically adhere to Fibre Channel protocol guidelines. By incorporating VSANs in a physical topology, you can include high availability on a logical level by separating large groups of fabrics, such as departmental and homogenous-OS fabrics, without the cost of extra hardware. It is a built-in security mechanism available in a FC switch that prevents traffic leaking between zones. Frames directed to devices outside of the originator's zone are dropped by the switching fabric. Thin pools, device mapping, and LUN masking work together to take extending separation down to the physical disks. The NAS can be configured to use any one of several techniques to provide security for end host connectivity. The requesting IP address is compared against the list of authorized IP addresses to determine if there is a match. Each virtual storage partition maintains separation from every other storage partition, so multiple tenants can share the same storage resource without compromise to privacy and security. Eliminating planned downtime and preventing unplanned downtime are key aspects in the design of the multi-tenant shared services infrastructure.
It is common for IaaS public cloud providers to offer an SLA target on average of 99.9% or 3 nines availability. A few components, such as managed security services, may be more applicable to the public cloud services context. Performance indicators will vary depending on how these services are deployed and abstracted to upper layer service level management software.
The latter varies based on the type of service component (VM, network, storage, firewall, and so forth). It is strategic for disaster planning, as well as everyday operations, and ensures that tenants can reliably access application servers. The core should have redundant paths to the campus and WAN as well as the aggregation layer VDC of any Compact Pods deployed in the datacenter. It sends rapid failure detection notices to the configured routing protocols on the local router to initiate the routing table recalculation process.
To reduce failure recovery times, OSPF removes the neighbor relationship to that router and looks for an alternative path without waiting for the hold timer to expire. There may be a separate core layer or the core could be collapsed onto the aggregation layer in a single Compact Pod datacenter design. MEC allows for redundant paths between entities while simultaneously removing the sub-optimal blocking architecture associated with traditional spanning tree designs. Appliances can be directly attached to the aggregation switches or to a dedicated services switch, usually a Cisco 6500 series switch. VPC allows for redundant paths between entities while simultaneously removing the sub-optimal blocking architecture associated with traditional spanning tree designs. The two-tier vPC design is enabled such that all paths from end-to-end are available for forwarding. In this design four 10Gbps links are used, however for scalability one can add up to eight vPC members in the current Nexus software release.
These notifications are sent to the Cisco UCS 6100 Series Fabric Interconnect, which updates its MAC address tables and sends gratuitous ARP messages on the uplink ports so the data center access layer network can learn the new path. The two VSMs run as an active-standby pair, similar to supervisors in a physical chassis, and provide high availability switch management. Primary nodes are responsible for performing failover of virtual machines in the event of host failure.
If the cluster consists of more than eight nodes, the maximum number of virtual machines supported for failover is 40 per host. A given host is deployed with a primary and redundant initiator port which is connected to the corresponding fabric. The fewer hops and fewer devices that are connected across a given interswitch link, the greater the performance of a given fabric.
Faults within one fabric are contained within a single fabric (VSAN) and are not propagated to other fabrics. In the event of an FC (NP) port link failure, affected hosts login again using available ports in a round-robin fashion.
The TimeFinder feature allows for local backups in the form of snaps, for storage with limited data resources that require a less costly backup solution, or clones, for a full blown local copy of critical data. NAS clusters include built-in, high-availability functionality that permits the cluster to detect and respond to failures of network interfaces, storage interfaces, servers and operating systems within the cluster. Solution is of you have computer backup in the Data Center you will not have to worry about these problems. VMware fornisce la protezione piu affidabile, semplice e a basso costo per tutte le applicazioni virtualizzate in caso di eventi disastrosi. In order to deal with any unrealistic adversity in future it is always good to have a standard policy implemented. A high end server, computer backup system guarantees that your critical business unit continues to run smoothly and competently, even if something unforeseen happens. Deploying multiple tenants in a common infrastructure yields more efficient resource use and lower costs.
For example, an Ethernet link between two switches provides a single-hop interconnection that can be virtualized using 802.1q VLAN tags.
A hierarchical IP network combines Layer 3 (routed), Services (firewall and server load balancing) and Layer 2 (switched) domains. From a data plane perspective, the VLAN tags can provide logical isolation on each point-to-point Ethernet links that connects the virtualized Layer 3 network devices (see Figure 2-2). Figure 2-4 shows an example of the Cisco DSN directly attached to aggregation layer switches.
As Figure 2-5 depicts, the first Cisco FWSM and Cisco ACE are primary for the first context and standby for the second context.
If a Cisco ACE fails, the standby context on its peer module becomes active with little traffic disruption. However, as physical hosts can now contain multiple logical servers; and therefore, policy must be applied at the VM level. As a result, high-density compute architectures may require the distribution of security policies to the access layer. Like firewalling at the aggregation layer, layer 2 firewalling can enforce security among the tiers of an application, as described in Application Tier Separation.
Using features found in the Nexus 1000V, you create port profiles and apply them to virtual machine NICs via the VMware vCenter.
Traditionally, each VMware ESX server has multiple LAN and SAN interfaces to separate vMotion, service console, NFS, backup, and VM data. In a multi-tenant scenario where distinct tenants reside on the same physical server and transmit their data over a shared physical interface, the infrastructure cannot isolate the tenant production data. Each virtual machine directory is stored in the Virtual Machine Disk (VMDK) sub-directory in the VMFS volume.
However, only 255 LUNs can be defined per host; since all resources are in a shared pool, this LUN limitation transfers to the server cluster. If communication must occur between tiers of an application, the traffic should be routed via the default gateway where security access lists can enforce traffic inspection and access control.
This is essentially a first-match algorithm, however, an additional qualification of rulesets exists that uses a hierarchy of precedence levels.
Low precedence rules include the default rules and the configuration of Data Center Low Precedence rules. They offer MDS-specific features that work with zoning to provide separation of services and multiple fabrics on the same physical topology.
The VSAN profile is set up so that fabric wide Fibre Channel services, such as name server and zone server, are fully replicated for each new VSAN.


Using this feature takes devices and creates a mapping of the device to the front-end ports on the array that connect into the SAN fabric. Three groups are configured; initiators (hosts), storage (devices), and ports (array front end ports) that contain at least 1 member per group. This section covers availability design considerations and best practices related to compute, network, and storage.
Once BFD is enabled on the interfaces and for the appropriate routing protocols, a BFD session is created, BFD timers are negotiated, and the BFD peers exchange BFD control packets at the negotiated interval. Certain service appliances, such as the ASA and ACE, can load balance by dividing their load among virtual contexts that allow the appliance to act as multiple appliances. With VSS, redundant modules can be paired across different chassis, but management can be simplified by presenting the two chassis as one to the administrator.
The Cisco Nexus 1000V Series VSM is not in the data path so even if both VSMs are powered down, the Virtual Ethernet Module (VEM) is not affected and continues to forward traffic.
You should also use the anti-affinity feature of VMware ESX to help keep the VSMs on different servers. To indicate health, VMware HA agent on each server maintains a heartbeat exchange with designated primary servers in the cluster. For HA cluster configurations spanning multiple blade chassis (that is, there are more than eight nodes in the cluster) or multiple data centers in a campus environment, ensure the first five nodes are added in a staggered fashion (one node per blade chassis or data center). As the environment reaches steady state, the percentage of resource reservation can be modified to a value that is greater than or equal to the average resource reservation size or amount per ESX host.
With a UCS deployment, a dual port mezzanine card is installed in each blade server and a matching vHBA and boot policy are setup providing primary and redundant access to the target device. Many organizations would like to consolidate their storage infrastructure into a single physical fabric, but both technical and business challenges make this difficult. Redundant paths from the hosts feed into dual, redundant MDS SAN switches (with dual supervisors) and then into redundant SAN arrays with tiered, RAID protection. In case of a port, ASIC, or module failure, the stability of the network is not affected because the logical PortChannel remains active even though the overall bandwidth is reduced. To accompany the local protection provided by TimeFinder, EMC's Symmetrix Remote Data Facility (SRDF) feature enables site to site protection.
The NAS cluster builds on this infrastructure to provide transparent failover of NFS or CIFS sessions.
Computer backup system will save your files from worms or viruses attacks and also restore corrupted files. However, each tenant requires isolation for security and privacy from others sharing the common infrastructure. Therefore, the three types of domains must be virtualized, and the virtual domains must be mapped to each other to keep traffic segmented. VRF information is carried across each hop in a Layer 3 domain, and multiple VLANs in the Layer 2 domain are mapped to the corresponding VRF. The second Cisco FWSM and Cisco ACE are primary for the second context and standby for the first context. Also, new technologies, such as vMotion, introduced VM mobility within a cluster, where policies follow VMs as they are moved across switch ports and among hosts.
However, Cisco VIC combined with VN-Link technology can isolate this data via VLAN-based separation. While a VM is operating, the VMFS volume locks those files to prevent other ESX servers from updating them. This enhancement provides flexibility in terms of applying rulesets at varying VI container level granularity. These rules must not conflict with higher precedence rules, such as Data Center High Precedence rules. Certain protocols and applications use dynamically allocated port ranges (FTP, MS-RPC, and so forth). In addition, the administrative user interfaces reduce troubleshooting costs and increase productivity.
This replication ensures that failures and interruptions from fabric changes affect only the VSAN in which they occur. A host contains HBAs that act as initiators and are mapped to the port world wide name (pWWN) of a target storage array fabric adapter (FA) port.
This mapping creates the equivalent of an access control list within the storage array where the devices can only access ports they are mapped to.
When End-Host Mode is enabled, STP is disabled and switching between uplinks is not permitted. However, Nexus 1000V uses the mac-pinning feature to provide more granular load-balancing methods and redundancy. Implementation details are described in another module of this solution document set, specific to the topic of DR. These ports access the fabric interconnect as N-ports which are passed along to a northbound FC switch.
This ratio can vary greatly depending on the size of the architecture and the performance required.
RAID 1 and 5 are deployed as two most commonly used levels; however the selection of a RAID protection level depends on the balance between cost and the criticality of the stored data. The MDS PortChannel solution scales to support up to 16 ISLs per PortChannel and aggregates 1-, 2-, 4-, 8-, or 10-Gbps Fibre Channel links. Multipathing software from VMware or the SAN storage vendor (such as EMC Powerpath software) further enhances HA, optimizing the available link bandwidth use and load balancing across multiple active host adapter ports and links for minimal disruption in service. Most of us who are not aware of the working process of a Data Center think that a data center disaster recovery plan is not at all practical.
Therefore, logical separation is a fundamental building block in multi-tenant environments. Because the Cisco VMDC solution is cloud architecture, this design assumes there is no need to connect the tenant VRFs because each tenant requires isolation and server-to-server communication among tenants is not required. This setup allows modules on both sides of the designs to be primary for part of the traffic, and it allows the network administrator to optimize network resources by distributing the load across the topology. Using the Cisco VIC, you can create distinct virtual adapters for each traffic flow using a single, two-port adapter. VLAN separation is accomplished when virtual adapters (up to 128) are mapped to specific virtual machines and VMkernal interfaces.
A VMDK directory is associated with a single VM; multiple VMs cannot access the same VMDK directory.
Although a 1:1 mapping of LUNs to tenant VMs is technically possible, it is not recommended because it does not scale and is an inefficient and expensive use of storage resources. The vShield Manager organizes virtual machines, networks, and security policies and allows security posture audits in the virtual environment.
Therefore, different pools can have different RAID configurations that provide separation at the disk RAID level. During this process, the user can define a device specific LUN number that is presented to the host. This can be particularly valuable in a tenant environment where it is desirable to present each tenant with their own appliance to ensure separation.
Upon server failure, the heartbeat is lost and all the VMs for that server restart on other available servers in the cluster's pool. Zoning within the redundant FC switches is done such that if one link fails then the other handles data access.
This feature aggregates up to 20,400 MB of application data throughput per PortChannel for exceptional scalability. Below are few of the points which will make you to focus on the fact that Data Center Recovery Plans are indeed practical.
In fact, as described in the preceding paragraph, the cluster file system management provided by the hypervisor isolates one tenant's VMDK from another.
Monitoring (VM Flow) is performed at the datacenter, cluster, portgroup, VLAN, and virtual machine levels.
As ephemeral port ranges above 1,024 are often used by botnets and rogue services, the VMDC design advocates using this feature to lock down these ports and to define allow rules only for specific ports for trusted endpoints. A prerequisite for VMware HA is that servers in the HA pool must share storage; virtual files must be available to all servers in the pool. Multipathing software is installed dependent on the operating system which ensures LUN consistency and integrity.
The MDS PortChannel solution neither degrades performance over long distances nor requires specific cabling.
This coupled with zoning mechanisms and LUN masking isolates tenant datastores within the SAN and at the file system level, serving to limit the effect of VM-based exploits or inadvertent disk corruption. MDS PortChannel uses flow-based load balancing to deliver predictable and robust performance independent of the distance covered.
When a zoneset resets, a slight disruption can occur as fabric state change notifications are sent to all switches in the fabric. To simplify initial configuration, all vShield firewalls perform stateful inspection and all traffic is permitted by default. However, the disruption caused by configuration changes occurs on a VSAN level for Cisco MDS switches running VSANs.



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