Dark Reading is part of the Informa Tech Division of Informa PLC

This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them.Informa PLC's registered office is 5 Howick Place, London SW1P 1WG. Registered in England and Wales. Number 8860726.

News

9/19/2008
09:30 AM
George Crump
George Crump
Commentary
50%
50%

NIC QOS?

Quality of service is the ability to provide different priority to different applications, users, or data flows, or to guarantee a certain level of performance to a data flow. Up until we started virtualizing servers, you generally only needed this at the network switch level. Now with the multitenant nature of virtualization hosts, we need QoS at the network interface.

Quality of service is the ability to provide different priority to different applications, users, or data flows, or to guarantee a certain level of performance to a data flow. Up until we started virtualizing servers, you generally only needed this at the network switch level. Now with the multitenant nature of virtualization hosts, we need QoS at the network interface.As I have alluded to in my last couple of blog entries, companies like Neterion already are doing this, and I expect the Fibre Channel over Ethernet companies like Emulex to follow suit soon. Why the sudden need? First, as I mentioned above, because in a virtual environment you can have multiple virtual servers all accessing the same I/O path, the network I/O queue that the hypervisor creates becomes the bottleneck. The second issue is that the amount of bandwidth that is provided by 10 GB, no matter what the protocol (FCoE, Fibre Channel, standard IP, or iSCSI), is more than enough I/O bandwidth for most virtual machines.

With I/O quality of service you can assign multiple virtual queues to the 10 GB of bandwidth and then assign those queues to specific virtual machines. A simple example is having a 10 GB card act like 10 1-GB virtual cards. Each of these virtual cards can be assigned to 10 virtual machines, guaranteeing 10 GB of bandwidth for each.

In virtualized environments, this becomes critical and allows for deeper virtualization by virtualizing even high I/O servers, since these servers can be given their own I/O queue. This assures them the needed bandwidth while not interfering with the other workloads on the host.

Virtualization continues to change the way you solve problems, but also changes the problems themselves. In the old days of one server and one application, there was little need for I/O QoS, but with multiple virtual machines demanding I/O bandwidth, it quickly becomes a requirement.

Track us on Twitter: http://twitter.com/storageswiss.

Subscribe to our RSS feed.

George Crump is founder of Storage Switzerland, an analyst firm focused on the virtualization and storage marketplaces. It provides strategic consulting and analysis to storage users, suppliers, and integrators. An industry veteran of more than 25 years, Crump has held engineering and sales positions at various IT industry manufacturers and integrators. Prior to Storage Switzerland, he was CTO at one of the nation's largest integrators.

Comment  | 
Print  | 
More Insights
Comments
Newest First  |  Oldest First  |  Threaded View
COVID-19: Latest Security News & Commentary
Dark Reading Staff 6/5/2020
Abandoned Apps May Pose Security Risk to Mobile Devices
Robert Lemos, Contributing Writer,  5/29/2020
How AI and Automation Can Help Bridge the Cybersecurity Talent Gap
Peter Barker, Chief Product Officer at ForgeRock,  6/1/2020
Register for Dark Reading Newsletters
White Papers
Video
Cartoon Contest
Write a Caption, Win a Starbucks Card! Click Here
Latest Comment: What? IT said I needed virus protection!
Current Issue
How Cybersecurity Incident Response Programs Work (and Why Some Don't)
This Tech Digest takes a look at the vital role cybersecurity incident response (IR) plays in managing cyber-risk within organizations. Download the Tech Digest today to find out how well-planned IR programs can detect intrusions, contain breaches, and help an organization restore normal operations.
Flash Poll
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2020-9074
PUBLISHED: 2020-06-05
Huawei Smartphones HONOR 20 PRO;Honor View 20;HONOR 20 have an improper handling of exceptional condition Vulnerability. A component cannot deal with an exception correctly. Attackers can exploit this vulnerability by sending malformed message. This could compromise normal service of affected phones...
CVE-2020-9859
PUBLISHED: 2020-06-05
A memory consumption issue was addressed with improved memory handling. This issue is fixed in iOS 13.5.1 and iPadOS 13.5.1, macOS Catalina 10.15.5 Supplemental Update, tvOS 13.4.6, watchOS 6.2.6. An application may be able to execute arbitrary code with kernel privileges.
CVE-2020-11975
PUBLISHED: 2020-06-05
Apache Unomi allows conditions to use OGNL scripting which offers the possibility to call static Java classes from the JDK that could execute code with the permission level of the running Java process.
CVE-2020-12723
PUBLISHED: 2020-06-05
regcomp.c in Perl before 5.30.3 allows a buffer overflow via a crafted regular expression because of recursive S_study_chunk calls.
CVE-2020-1883
PUBLISHED: 2020-06-05
Huawei products NIP6800;Secospace USG6600;USG9500 have a memory leak vulnerability. An attacker with high privileges exploits this vulnerability by continuously performing specific operations. Successful exploitation of this vulnerability can cause service abnormal.