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Where IT Perceptions are Reality
Application Report
The Pendulum
Swings Back to Shared Storage
for VMware ESXi
Featuring
VMware ESXi
ATTO XstreamCORE™
Torcon Implementation
Application Report v3, June, 2018 Copyright © 2018 IT Brand Pulse Page 2
The Storage Pendulum
The Migration from DAS to Networked Storage Driven by Higher Utilization
The use of enterprise-class NAS and SAN storage systems went mainstream at the turn of the millennium. By
2000, IT organizations were flocking to shared storage architectures because they catapulted storage
utilization in data centers from an average of 30% to 80%, while dramatically increasing availability of the
storage system and data.
For Small-Medium Businesses (SMBs), VMware Sparked a Swing Back to DAS
In the early 2000’s, a small company named VMware was selling server virtualization tools into IT vendor labs
to consolidate workloads and reduce the number of servers needed for testing. Adoption exploded after the
technology crossed over into production IT environments. Today, well over half of all enterprise workloads
are hosted on hypervisors such as VMware ESXi. In virtualized server environments at SMBs, direct-attached
storage emerged as the preferred form of storage. The cost of entry for DAS storage is lower than a NAS or
SAN, scales easily by adding servers with SAS storage, and is resilient with live migrations of virtual machines
and data.
Before NAS and SANs were widely deployed, servers were typically dedicated to a single app, and storage was dedicated to a single server. Storage
utilization for database servers would be high, while storage for most other applications servers would often be grossly underutilized.
DAS to SAN Migration Started in the Late 1990s
Server Virtualization Across Company Size
According to a survey by Spiceworks, by 2016 well over half of small-medium companies were using VMware hypervisors. In companies with over
500 employees, the percentage of companies using hypervisors reached 80%.
Application Report v3, June, 2018 Copyright © 2018 IT Brand Pulse Page 3
Challenges for Small-Medium Business and Direct-Attached Storage for ESXi
The use of DAS for VMware ESXi is cost-effective, but it comes with a set of challenges—mostly due to the
fact that small-to-medium businesses have far fewer IT resources than large IT organizations. As a result,
what we find common in direct-attached ESXi storage environments at SMBs are:
1) High performance (10GbE or higher) networks are rare—which means vMotion of storage can take
hours on 1GbE or 10GbE networks, even when IT organizations follow proper recommendations for
configuring an isolated vMotion network.
2) Network isolation is rare—so lengthy periods of vMotion can disrupt performance of application servers
sharing the same network as the vMotion.
The Best Way to Speed-up vMotion is to Co-Locate Storage
VMware small-medium business customers have discovered that one of the best ways to speed vMotion of
storage (and extend the life of their direct-attached storage) is to convert it to a Fibre Channel SAN. This
significantly reduces any vMotion data traffic across the Ethernet Network and allows all hosts to connect to
the storage fabric. Once installed, storage is easily managed as the datastores are still intact and there is
limited need to move the VM storage files since they are accessible by all hosts.
Swinging Back Again to SANs
SAS
Ethernet
SAS
Ethernet FC
vMotion traffic shares Ethernet network with app servers vMotion traffic isolated on FC-SAS storage network
Application Report v3, June, 2018 Copyright © 2018 IT Brand Pulse Page 4
DAS to SAN Conversion
Torcon provides construction management and general contracting services to leading
corporations and private institutions. Torcon consistently ranks high on the
Engineering News-Record “Top Contractors” list being 14th of 65 in 2017. Torcon has a
record of more than $4 billion in managed construction projects over the past decade.
The Torcon datacenter had three hosts sharing one SAS RAID Array. Their expansion
options were limited and the system was struggling to keep up with demands on its
resources. The server hardware was only a few years old yet Torcon was already considering a full replacement.
The company converted their direct-attached SAS environment to a Fibre Channel storage area network, which not
only saved Torcon the expense of replacing their old hardware, it gave them a wide open path for future expansion.
The Results
• The hardware they were looking to replace will stay in service, completing its five-year life-cycle and meeting ROI
expectations.
• The life of Torcon’s entire system, servers and storage, were extended with added functionality and expansion
options. This implementation saved tens of thousands of dollars in new hardware and allows Torcon to scale SAN
storage by adding cost effective SAS arrays.
• Converting their SAS storage to a Fibre Channel SAN provided Torcon with a 16Gb/s shared storage network. In
Torcon’s case the Fibre Channel SAN allowed them to scale up to new storage and new servers as they need while
keeping this solution as the core of their IT datacenter and keeping the LAN free from vMotion traffic moving
forward.
• With a separate network for vMotion, virtual machine users are able to immediately experience a faster, more
robust LAN network as storage traffic has its own path to physical servers. When multiple host servers are
attached to separate SAS arrays, storage traffic will travel over the LAN and bottleneck LAN traffic. As Torcon
grows their infrastructure they have the peace of mind that their LAN will be robust with no slowdowns.
• ATTO XstreamCORE allows all of Torcon’s current storage and server hardware to be re-used and when they do
need to upgrade, a “hidden” cost-savings they no doubt will be thankful for when the time comes, is the ability to
just add new storage or new server nodes without requiring a rip and replace.
• The hardware ATTO used at Torcon includes ATTO Celerity™ 16Gb dual port Fibre Channel host bus adapters and
an ATTO XstreamCORE FC 7550 SAN storage controller. The controller is what ATTO calls “an accelerated protocol
conversion appliance” that allows Fibre Channel HBAs to talk to SAS/SATA RAID boxes with less than four
microseconds of latency.
• The entire upgrade took less than three hours. Once the controllers and HBAs were installed and the server
powered up, datastores were immediately recognized on new paths. This process was repeated across all servers
without having to bring the system down, allowing users to work as usual during the upgrade.
Real-Life Implementation
Application Report v3, June, 2018 Copyright © 2018 IT Brand Pulse Page 5
ATTO Technology, Inc.
ATTO Technology specializes in storage and network connectivity and infrastructure solutions for the data-intensive
computing environments.
ATTO XstreamCORE™ Overview
ATTO XstreamCORE is a solid state appliance that connects SAS SSD and Hard Drive
solutions using standard JBODs, JBOFs or RAID arrays to Ethernet or Fibre Channel
networks. Attach up to 960 total drives to multiple servers and assign drives on a drive by
drive basis to one or many servers.
High Performance. Minimal Latency.
ATTO XstreamCORE architecture was designed to push the envelope on performance.
ATTO xCORE technology enables the XstreamCORE to achieve up to 1.2M 4K IOPS or
6.4GB/s throughput per controller when attached to commodity SAS storage or RAID
arrays. The amount of latency added is extremely lower than server based solutions that
convert SAS to other protocols as servers were not designed to efficiently translate
between protocols.
Build a Cost Effective Infrastructure
ATTO XstreamCORE integrates with commodity level storage and allows you to only pay for storage as it’s needed.
XstreamCORE disaggregates storage from compute resources so you are not forced to add the expense of more
servers and more software licensing costs when you only need to increase capacity or add flash storage. With a
performance footprint that drives full racks of storage, it doesn’t take long before you become a hero for saving
significant budget dollars.
Solve Blade Server Storage Limitation Issues
Add storage to space limited blade servers – XstreamCORE features mapping technology that allows IT administrators
to assign individual or multiple drives to a single server or multiple servers. The flexibility provided by XstreamCORE
allows the mapping and assignment of up to 960 commodity drives without the cost of expensive all flash array storage
or Enterprise storage licensing.
Get longer life out of existing SAS Direct Attached Storage
When you have isolated SAS storage silos, XstreamCORE connects this stranded storage to shared Ethernet or Fibre
Channel SANs allowing greater flexibility and usefulness. Even if there is no SAN installed the benefits that
XstreamCORE will add are enormous including the ability to increase the speed at which live migration of virtual
machines take between physical server hosts.
SAN Controllers Makes it Possible
Application Report v3, June, 2018 Copyright © 2018 IT Brand Pulse Page 6
SAS-Based SANs are a Powerful Tool for Cost-Conscious SMBs
SAS RAID and JBOD arrays provide superior performance but are significantly less expensive that Fibre Channel arrays.
SMBs can have their cake and eat it too by deploying SAS storage along with a SAS-to-FC controller. The bottom line for
cost-conscious SMBs is that SAS-based SAN architectures should be considered. They provide the performance,
availability and scalability of Fibre Channel SANs with the cost of commodity SAS storage.
Related Links
VMware Solution Exchange—ATTO Solutions
VMware Use Your Direct Attached Storage to Create a SAN Solution Brief
ATTO Turn DAS Storage Into a SAN Solution Brief
ATTO XstreamCORE SAN Controllers
ATTO Technology, Inc.
IT Brand Pulse
The Author
Frank Berry is founder and senior analyst for IT Brand Pulse, a trusted source of data and analysis
about IT infrastructure, including servers, storage and networking. As former vice president of
product marketing and corporate marketing for QLogic, and vice president of worldwide marketing
for the automated tape library (ATL) division of Quantum, Mr. Berry has over 30 years experience in
the development and marketing of IT infrastructure. If you have any questions or comments about
this report, contact frank.berry@itbrandpulse.com.
The Bottom Line

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Application Report

  • 1. Where IT Perceptions are Reality Application Report The Pendulum Swings Back to Shared Storage for VMware ESXi Featuring VMware ESXi ATTO XstreamCORE™ Torcon Implementation
  • 2. Application Report v3, June, 2018 Copyright © 2018 IT Brand Pulse Page 2 The Storage Pendulum The Migration from DAS to Networked Storage Driven by Higher Utilization The use of enterprise-class NAS and SAN storage systems went mainstream at the turn of the millennium. By 2000, IT organizations were flocking to shared storage architectures because they catapulted storage utilization in data centers from an average of 30% to 80%, while dramatically increasing availability of the storage system and data. For Small-Medium Businesses (SMBs), VMware Sparked a Swing Back to DAS In the early 2000’s, a small company named VMware was selling server virtualization tools into IT vendor labs to consolidate workloads and reduce the number of servers needed for testing. Adoption exploded after the technology crossed over into production IT environments. Today, well over half of all enterprise workloads are hosted on hypervisors such as VMware ESXi. In virtualized server environments at SMBs, direct-attached storage emerged as the preferred form of storage. The cost of entry for DAS storage is lower than a NAS or SAN, scales easily by adding servers with SAS storage, and is resilient with live migrations of virtual machines and data. Before NAS and SANs were widely deployed, servers were typically dedicated to a single app, and storage was dedicated to a single server. Storage utilization for database servers would be high, while storage for most other applications servers would often be grossly underutilized. DAS to SAN Migration Started in the Late 1990s Server Virtualization Across Company Size According to a survey by Spiceworks, by 2016 well over half of small-medium companies were using VMware hypervisors. In companies with over 500 employees, the percentage of companies using hypervisors reached 80%.
  • 3. Application Report v3, June, 2018 Copyright © 2018 IT Brand Pulse Page 3 Challenges for Small-Medium Business and Direct-Attached Storage for ESXi The use of DAS for VMware ESXi is cost-effective, but it comes with a set of challenges—mostly due to the fact that small-to-medium businesses have far fewer IT resources than large IT organizations. As a result, what we find common in direct-attached ESXi storage environments at SMBs are: 1) High performance (10GbE or higher) networks are rare—which means vMotion of storage can take hours on 1GbE or 10GbE networks, even when IT organizations follow proper recommendations for configuring an isolated vMotion network. 2) Network isolation is rare—so lengthy periods of vMotion can disrupt performance of application servers sharing the same network as the vMotion. The Best Way to Speed-up vMotion is to Co-Locate Storage VMware small-medium business customers have discovered that one of the best ways to speed vMotion of storage (and extend the life of their direct-attached storage) is to convert it to a Fibre Channel SAN. This significantly reduces any vMotion data traffic across the Ethernet Network and allows all hosts to connect to the storage fabric. Once installed, storage is easily managed as the datastores are still intact and there is limited need to move the VM storage files since they are accessible by all hosts. Swinging Back Again to SANs SAS Ethernet SAS Ethernet FC vMotion traffic shares Ethernet network with app servers vMotion traffic isolated on FC-SAS storage network
  • 4. Application Report v3, June, 2018 Copyright © 2018 IT Brand Pulse Page 4 DAS to SAN Conversion Torcon provides construction management and general contracting services to leading corporations and private institutions. Torcon consistently ranks high on the Engineering News-Record “Top Contractors” list being 14th of 65 in 2017. Torcon has a record of more than $4 billion in managed construction projects over the past decade. The Torcon datacenter had three hosts sharing one SAS RAID Array. Their expansion options were limited and the system was struggling to keep up with demands on its resources. The server hardware was only a few years old yet Torcon was already considering a full replacement. The company converted their direct-attached SAS environment to a Fibre Channel storage area network, which not only saved Torcon the expense of replacing their old hardware, it gave them a wide open path for future expansion. The Results • The hardware they were looking to replace will stay in service, completing its five-year life-cycle and meeting ROI expectations. • The life of Torcon’s entire system, servers and storage, were extended with added functionality and expansion options. This implementation saved tens of thousands of dollars in new hardware and allows Torcon to scale SAN storage by adding cost effective SAS arrays. • Converting their SAS storage to a Fibre Channel SAN provided Torcon with a 16Gb/s shared storage network. In Torcon’s case the Fibre Channel SAN allowed them to scale up to new storage and new servers as they need while keeping this solution as the core of their IT datacenter and keeping the LAN free from vMotion traffic moving forward. • With a separate network for vMotion, virtual machine users are able to immediately experience a faster, more robust LAN network as storage traffic has its own path to physical servers. When multiple host servers are attached to separate SAS arrays, storage traffic will travel over the LAN and bottleneck LAN traffic. As Torcon grows their infrastructure they have the peace of mind that their LAN will be robust with no slowdowns. • ATTO XstreamCORE allows all of Torcon’s current storage and server hardware to be re-used and when they do need to upgrade, a “hidden” cost-savings they no doubt will be thankful for when the time comes, is the ability to just add new storage or new server nodes without requiring a rip and replace. • The hardware ATTO used at Torcon includes ATTO Celerity™ 16Gb dual port Fibre Channel host bus adapters and an ATTO XstreamCORE FC 7550 SAN storage controller. The controller is what ATTO calls “an accelerated protocol conversion appliance” that allows Fibre Channel HBAs to talk to SAS/SATA RAID boxes with less than four microseconds of latency. • The entire upgrade took less than three hours. Once the controllers and HBAs were installed and the server powered up, datastores were immediately recognized on new paths. This process was repeated across all servers without having to bring the system down, allowing users to work as usual during the upgrade. Real-Life Implementation
  • 5. Application Report v3, June, 2018 Copyright © 2018 IT Brand Pulse Page 5 ATTO Technology, Inc. ATTO Technology specializes in storage and network connectivity and infrastructure solutions for the data-intensive computing environments. ATTO XstreamCORE™ Overview ATTO XstreamCORE is a solid state appliance that connects SAS SSD and Hard Drive solutions using standard JBODs, JBOFs or RAID arrays to Ethernet or Fibre Channel networks. Attach up to 960 total drives to multiple servers and assign drives on a drive by drive basis to one or many servers. High Performance. Minimal Latency. ATTO XstreamCORE architecture was designed to push the envelope on performance. ATTO xCORE technology enables the XstreamCORE to achieve up to 1.2M 4K IOPS or 6.4GB/s throughput per controller when attached to commodity SAS storage or RAID arrays. The amount of latency added is extremely lower than server based solutions that convert SAS to other protocols as servers were not designed to efficiently translate between protocols. Build a Cost Effective Infrastructure ATTO XstreamCORE integrates with commodity level storage and allows you to only pay for storage as it’s needed. XstreamCORE disaggregates storage from compute resources so you are not forced to add the expense of more servers and more software licensing costs when you only need to increase capacity or add flash storage. With a performance footprint that drives full racks of storage, it doesn’t take long before you become a hero for saving significant budget dollars. Solve Blade Server Storage Limitation Issues Add storage to space limited blade servers – XstreamCORE features mapping technology that allows IT administrators to assign individual or multiple drives to a single server or multiple servers. The flexibility provided by XstreamCORE allows the mapping and assignment of up to 960 commodity drives without the cost of expensive all flash array storage or Enterprise storage licensing. Get longer life out of existing SAS Direct Attached Storage When you have isolated SAS storage silos, XstreamCORE connects this stranded storage to shared Ethernet or Fibre Channel SANs allowing greater flexibility and usefulness. Even if there is no SAN installed the benefits that XstreamCORE will add are enormous including the ability to increase the speed at which live migration of virtual machines take between physical server hosts. SAN Controllers Makes it Possible
  • 6. Application Report v3, June, 2018 Copyright © 2018 IT Brand Pulse Page 6 SAS-Based SANs are a Powerful Tool for Cost-Conscious SMBs SAS RAID and JBOD arrays provide superior performance but are significantly less expensive that Fibre Channel arrays. SMBs can have their cake and eat it too by deploying SAS storage along with a SAS-to-FC controller. The bottom line for cost-conscious SMBs is that SAS-based SAN architectures should be considered. They provide the performance, availability and scalability of Fibre Channel SANs with the cost of commodity SAS storage. Related Links VMware Solution Exchange—ATTO Solutions VMware Use Your Direct Attached Storage to Create a SAN Solution Brief ATTO Turn DAS Storage Into a SAN Solution Brief ATTO XstreamCORE SAN Controllers ATTO Technology, Inc. IT Brand Pulse The Author Frank Berry is founder and senior analyst for IT Brand Pulse, a trusted source of data and analysis about IT infrastructure, including servers, storage and networking. As former vice president of product marketing and corporate marketing for QLogic, and vice president of worldwide marketing for the automated tape library (ATL) division of Quantum, Mr. Berry has over 30 years experience in the development and marketing of IT infrastructure. If you have any questions or comments about this report, contact frank.berry@itbrandpulse.com. The Bottom Line