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Bill Gram-Reefer
Works at WORLDVIEW PR
Attended Indiana University of Pennsylvania
Lives in Concord, CA
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Bill Gram-Reefer

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Learning every day on how to generate great leads for my clients.
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Bill Gram-Reefer

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virtualization not plug and play
 
Virtualization Nightmare
I'd like to share our experience with some brand new hardware we got for testing VM server solutions, to migrate multiple physical servers into VM server solutions. We got very disappointing results, here is the story.

We used the following new hardware:
- HP DL380p Gen8 Server 128 GB RAM ( 2 x Xeon 8 core CPUs)
- Onboard SAS controller with eight 6 Gb-SAS channels (2 x 4 - SFF8088 ports)
- HP H221 second PCI SAS host bus adapter with eight 6 Gb-SAS channels (2 x 4 - SFF8088)
- A HP P2000 G3 RAID equipped with 24 2.5” 15k RPM SAS disks connected via up to four mini-SAS ports to the server (four ports each with 4 x 6 Gb-SAS)

Side note: all SAS controllers use LSI chips and the internal and external PCI controller offers about the same performance. However, the external controller can boot only from the first disk, whereas the internal controller allows choosing the boot disk.

RAID storage layout
We use an SAS RAID to keep connections simple between the server and the storage. SAS has also the benefit that we have a low-latency storage and that we can connect up to four mini-SAS SFF8088 connectors, with each supporting 4 x 6 Gbit SAS channels.

One major problem we experienced with the storage is that when we have heavy large file I/O, e.g. reading and writing 100 GB files, the system is so busy writing data that a single additional “ls” command takes several seconds. It seems the queue of pending writes for a single file keeps the controller busy for additional requests. To avoid this, it is required to work with multiple controllers using multiple RAID groups connected to separate SAS ports on the RAID and separate SAS ports on the server.

We have not finally decided how the disk configuration will be but is it likely that we use 4 different RAID-5 groups connected on separate SAS ports.

Native Linux or Windows
The good news is that the server and storage work great, with excellent performance running the latest Linux or Windows Server operating systems. Everything works and we get more than 800 MB/sec with a single SFF8088 cable. Adding another cable to a an additional RAID group gives us more than 1000 MB/sec.

VMware ESX Server 5.5
Extremely poor disk performance
The hardware works completely under VMware 5.5, but the disk performance we get (< 400 MB/sec) within a Linux or Windows VM guest OS is less than half of the native performance, which is completely disappointing. As a control, we tried to use one controller with passthrough into Linux VM which provided the expected 800 MB/sec. Unfortunately, PCI passthrough does not work with HP servers in ESX 5.5, so we needed to downgrade to VMware ESX 5.1 for this test. While passthrough mode demonstrates the capability of the hardware, it cannot be used in practice because then key VMware features cannot be used, and because it is limited to one VM only.

In summary, the VMware ESX 5.5 and 5.1 managed storage gives us less that 50% of potential disk performance. We are very disappointed with the performance.
 
Windows Server 2012r2 with Hyper-V
Extremely poor network performance
Windows Server installs and works fine on this machine, and running a Hyper-V Linux VM gives us the expected 800 MB/sec performance within the VM, which is more than twice the disk performance of VMware. However, the problem is that the network adapter works extremely slow within the Linux or Windows VM. We need to resolve the problem because within the host OS Windows Server 2012r2, network performance is great, only the VM has the problem. Again the solution is disappointing because of the network performance problem.

Summary
That's the current status. We will continue to perform additional tests and update this article. At this point it is clear that VM deployment should not be considered a "plug-and-play" technology, at least if you want to be certain you are achieving the full potential of the underlying hardware. We suspect that a high percentage of VM deployments never compare native performance to VM performance, and hence are unaware of the need for further tuning, and if that fails, the potentially significant performance tradeoff.

Any comments?
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Bill Gram-Reefer

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Pleasant Hill and Concord improve with Walnut Creek 680 Corridor overall. http://halfwaytoconcord.com/walnut-creek-680-corridor-colliers/
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Bill Gram-Reefer

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Good job, Ken. The West County School Bond is illegal as the district is already at $1B+ for bonds and is already way past its assessed value which by law limits how much a district can borrow. This is junk bond status.
Ben Franklin said, "Nothing is certain except death and taxes." With that said, the taxpayers in Contra Costa County are on life support.For Chinese, 2014 is the "Year of the Horse.
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If only the Supervisors would take Grand Jury findings seriously.
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Have him in circles
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Bill Gram-Reefer

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Free fix for #Minecraft on #Yosemite. SuperSync installer adds all files so #gamers can load and play Minecraft on their Macs running OS 10.x in minutes.
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Redpark ships industry first Lightning Serial+Power cable for iOS. Allows applications to run 24x7 as users can now charge iOS device AND connect via lightning device in POS, retail, process control, or any number of uses in medical, education, labs, and commerce.
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I they tell him will they have to kill him?Collusion between UC Berkeley and the NSA? 
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I wonder if the 10 round magazine rule might work here (from another California Supreme Court case) 10 rounds or $X should be enough, anything more is supporting prolonged nondefensive attacks on people or democratic process.
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  Surprise, surprise: An analysis released today found that a proposed minimum wage hike would eliminate hundreds of thousands of jobs. Today the Congressional Budget Office (CBO) announced it agreed with the Heritage Foundation’s analysis of President Obama’s proposed minimum wage increase. Of course the CBO did not put it … More
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Let's see. 900k off welfare, and a slight bump for the 500k now on welfare who would lose jobs. From a taxpayer perspective, that's a no-brainer. 
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Have him in circles
183 people
Thomas Perdue's profile photo
Christy Correll's profile photo
Judy Lloyd's profile photo
Jeffrey Kasper's profile photo
Gideon Strauss's profile photo
David Morgenstern's profile photo
Fiberstore's profile photo
Krzysztof Pietrzak's profile photo
Steven Willett's profile photo
Work
Occupation
Content Marketing, SEO PR and Media Relations, Hyper-Local Blogger
Skills
Strengths include:strategy, writing, press releases, content marketing, public speaking, web design, social media, and integrated marketing communications, publications
Employment
  • WORLDVIEW PR
    President, 1991 - present
  • Halfway To Concord
    Editor & Publisher, 2004 - 2012
  • Western MicroMarket
    Associate Publisher, 1988 - 1990
  • MicroTimes
    National Accounts Director, 1985 - 1990
  • ShowPage
    Editor, 1984 - 1985
Places
Map of the places this user has livedMap of the places this user has livedMap of the places this user has lived
Currently
Concord, CA
Previously
Pleasant Hill, CA - San Francisco, CA - Pittsburgh, PA - Kent, OH - Grove City, PA - Beaver Falls, PA - Ligonier, PA - Indiana, PA
Contact Information
Work
Email
Story
Tagline
Expert solutions for business owners that want the Internet to work for them
Introduction
At WORLDVIEW, I deliver solutions to C-level marketers to make their brand and news more visible online. I help businesses and organizations integrate Internet PR, SEO, Website design and optimization and social media to tell their story to B2B and B2C customers and media to build authority, reach, and response.

My blog, Halfway To Concord, (PR4) is a leading, hyperlocal blog covering California, and Contra Costa County news, business, real estate, politics, non-profits and community events.
Bragging rights
Strict Press 205# 8-11-12 (cross fit sweatshop, walnut creek, ca)
Education
  • Indiana University of Pennsylvania
    BA Political Science/English, 1970 - 1974
  • Kent State University
    MA History, 1975 - 1977
Basic Information
Gender
Male
Other names
William Deane Reefer, Reef, BGR, Hey You
Bill Gram-Reefer's +1's are the things they like, agree with, or want to recommend.
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