Το Multi-Tenant Cloud

Κατά την διάρκεια του Microsoft Build conference το οποίο έλαβε χώρα από τις 13 εως τις 16 Σεπτεμβρίου 2011 στο Anaheim, η Microsoft παρουσιάσε μια πρώτη γεύση των χαρακτηριστικών του Windows Server 8, που περιλαμβάνει όπως είναι αναμενόμενο και τον Hyper-V, ο οποίος θα επιτρέπει σε επιχειρήσεις να υποστηρίζουν εγκαταστάσεις Infrastructure as a Service (IaaS) χρησιμοποιώντας public, private

και hybrid, καθώς επίσης και αρχιτεκτονικές multitenant cloud. Ένα multi-tenant cloud αποτελεί ένα cloud infrastructure το οποίο έχει την δυαντότητα να φιλοξενεί (hosting) services (workloads) για πολλαπλές επιχειρήσεις (Αγγλικός Όρος : distinct departments within a

single company in a private cloud, or distinct companies in a public

cloud) ενώ ταυτόχρονα διασφαλίζει την ασφάλεια των δεδομένων διατηρώντας σε ασφαλή απομόνωση τον φόρτο εργασίας μεταξύ των διαφόρων ενοικιαστών ( 

tenants

).

Επιπλέον, μια υποδομή  

multi-tenant cloud είναι σε θέση δυναμικά να διαχειρίζεται και να αναδιανέμει

tenant workloads

σε οποιοδήποτε διαθέσιμο host στο cloud χωρίς να γίνεται κανένας συμβιβασμός στην ασφάλεια των δεδομένων λόγω της ασφαλούς απομόνωσης του φόρτου εργασίας. Τέλος, η υποδομή

multi-tenant cloud

πρέπει να είναι σε θέση να παρέχει και να εγγυηθεί τις ευδιάκριτες

Service Level Agreements (SLAs)

που είναι βασισμένες στις οργανωτικές απαιτήσεις, και παρέχουν τον πόρο που μετρά με βάση παραμέτρους οι οποίες εγγυώνται την σωστή μέτρηση για την χρήση των πόρων σύννεφων σε κάθε οργάνωση. Προκειμένου να ενεργοποιηθούν  

multi-tenant cloud

υποδομές, ο

Windows Server 8

περιλαμβάνει μια σειρά νέων τεχνικών χαρακτηριστικών γνωρισμάτων τα οποία περιλαμβάνουν  

Hyper-V, storage, network,

high-availability, disaster recovery, και manageability.

 .

Τεχνικά χαρακτηριστικά του Hyper-V Core στον Windows Server 8 

Στον Windows Server

8, τα χαρακτηριστικά του Hyper-V εμπλουτίστηκαν και βελτιώθηκαν, έχοντας σαν αποτέλεσμα την θεαματική βελτίωση του virtual machine performance

και το κυριότερο απ'όλα παρέχει εκείνη την αναβαθμιζόμενη βάση για virtualization η οποία είναι απαραίτητη για υποδομές cloud.

Στον πίνακα 1 παρουσιάζεται μια σύγκριση μεταξύ των χαρακτηριστικών του Hyper-V key ανάμεσα στον Windows

Server 2008 R2 και τον Windows Server 8.

Table 1: Hyper-V - Σύγκριση χαρακτηριστικών

Παρακάτω σας παραθέτω, αυτούσιο στην Αγγλική το κείμενο στο οποίο παρουσιάζονται αναλυτικά τα καινούρια χαρακτηριστικά, και σας παρακαλώ να με συγχωρέσετε για την μη μετάφραση στην Ελληνική γλώσσα διότι όπως θα διαπιστώσετε και εσείς λόγω των τεχνικών όρων δεν προσφερεται για μετάφραση.

Hyper-V now supports 2 TB of physical memory and a maximum of 160

logical processors. In Hyper-V, it is not only cores that are included

in the logical processor count, so are threads if a core is Simultaneous

Multi-Threading (SMT) enabled. Therefore, the following formula is

handy to calculate the number of logical processors that Hyper-V can see

on a given physical server:

# of Logical Processors = (# of Physical Processors) * (# of Cores) * (# of Threads per Core)

The increase in memory and logical processor support in Windows

Server 8 provides the basis upon which to build dense virtual machine

populations for private and public cloud infrastructures. In addition,

Hyper-V in Windows Server 8 supports enhanced virtual machine

performance by enabling the assignment of up to 512 GB of RAM and 32

virtual processors to a virtual machine. That can easily accommodate

scale up of high-performing workloads especially coupled with

intelligent resource management features like dynamic memory, and new

networking and storage management features that you will discover later

in this article.

For systems and applications that are built on top of a non-uniform

memory access (NUMA) architecture, Windows Server 8 provides guest NUMA.

Guest NUMA means that Hyper-V ensures guest virtual machine processor

and memory affinity with physical host resources.

Another upgraded feature in Windows Server 8 is the expansion of

failover clusters to 63 nodes (from 16 nodes in Windows Server 2008 R2),

effectively quadrupling the size of a cluster and the number of running

virtual machines to 4000 (from 1000 in Windows Server 2008 R2) per

cluster.

With Windows Server 8, Hyper-V also supports multiple, concurrent

live migrations of virtual machines. The number of concurrent live

migrations is bounded only by the inherent resource constraints of the

infrastructure rather than the serial limitation imposed in Hyper-V on

Windows Server 2008 R2.

And while Live Migration has been a cluster-centric feature requiring

shared storage, the story gets significantly better in Windows Server 8

with the support for live migration of a virtual machine between any

two hosts without requiring clustering, shared storage, or any shared

resources other than a network connection. You can control which Hyper-V

hosts participate in this Live Migration mode, as well as the number of

concurrent live migrations allowed by a host, and the network to use to

perform the live migration. Furthermore, there is additional

granularity in the selection of virtual machine components to migrate,

allowing you to choose all components, including the VHD files, current

configuration, snapshots, and second level paging, or only some of these

components. You also have the ability to move the virtual machine data

to a single location, or to specify individual locations for every

selected virtual machine component.

As if all this goodness wasn’t enough, Hyper-V also provides Live

Storage Migration that supports moving virtual machine storage resources

between physical storage units without service interruption.

Hyper-V Key Storage Features στον Windows Server 8

One of the

main new Hyper-V storage features is the addition of a virtual Fibre

Channel HBA adapter for virtual machines. This allows a virtual machine

to connect to a Fibre Channel SAN, and enables new scenarios like guest

clustering, use of MPIO, and other multipathing solutions for workloads

that require high-performing SAN and application availability. This

feature is available to existing Windows virtual machines like Windows

Server 2008 R2 running on Hyper-V on Windows Server 8.

Another new storage feature is the VHDX format, a new virtual hard

disk (VHD) format that is introduced in Windows Server 8. With VHDX, the

maximum size of a VHD increases to 16 TB, instead of the current 2 TB

limit with the current VHD format which forces the use of pass-through

disks to meet larger virtual disk storage requirements. The VDHX format

also provides large sector support, and allows embedding user-defined

metadata.

Along with the increase in virtual disk size is an impressive

performance boost when creating or managing large VHDX-based formats

using the Offloaded Data Transfer (ODX) features of storage systems.

Hyper-V support for ODX in Windows Server 8 allows handing off

operations like data transfers and file creations to the storage system

which can perform the actions with much higher performance while

reducing the impact of associated operations on the Hyper-V host

processor.

Hyper-V Key Network Features στον Windows Server 8

On the

networking side, one the of the key Hyper-V features in Windows Server 8

is the extensible Hyper-V switch. The Hyper-V switch is the component

that controls the configuration and creation of external, internal, and

private networks that support virtual machine connectivity to physical

networks, to other virtual machines and the Hyper-V host, or to a subset

of virtual machines, respectively. In Windows Server 2008 R2, the

Hyper-V switch functionality cannot be modified. In Windows Server 8, an

API exists that enables extension of the Hyper-V switch functionality.

Microsoft’s goal is to enable security vendors to develop new security

appliances as pluggable switch modules, enable switch vendors to create

switch extensions that unify virtual and physical switch management, and

enable network application vendors to create network monitoring

extensions for the Hyper-V switch. Taking advantage of the Hyper-V

switch extensibility, Cisco Systems has already announced support for Windows Server 8 Hyper-V with its Cisco Nexus 1000V switch.

Probably one of the most requested networking features included in

Windows Server 8 and supported by Hyper-V is NIC teaming. Up through

Windows Server 2008 R2, NIC teaming has only been available as a

third-party option. Windows Server 8 provides native NIC teaming that is

configurable at the host (parent partition) or virtual machine (guest

partition) level in either load balancing or failover mode. As a bonus,

this new NIC teaming feature even works across different vendor network

adapters.

Ελπίζω ότι τα παραπάνω θα σας φανούν ιδιαίτερα χρήσιμα.