(Interrupted) poor disk i/o on the VMS during file transfers

Hi - I'm a newbie to vSphere useage. My apologies if this is obvious...!

What overall behavior we are seeing?

-Transfer speeds of slow file between given VM and a remote computer

-VMs periodically freezes on the command-line ssh connection

What tests have been done and what were the results?

-Download wget via known connection 100 Mbps-> transfer speed is very low and has declined steadily, vmstat suggests the VM freezes when it writes the data in the buffer to disk

-transfer of physical machine to the virtual machine is much slower than expected, speed decreases and then increases after a period of time - there seems to be a total blockage of the I/O for about 5 minutes, during the transfer of large files

-write speed disc shows 19 Mbps

-before install us VM we receive transfers to all about 95Mbps between machines on the network and almost as good from remote machines with good pipes to their end

NB during those tests, no intensive activity happening on any of the other virtual machines. During the normal use of all virtual machines, at least 2 if not all virtual machines become so slow as to be unusable.

We have a kit that we think should be more than enough.

We organise four VM (linux, CentOS).

Most of the work of the virtual machine will occur will be file transfers to/from the VM and the LAN to the host or remote device via the internet.

Files will be read or written in a/Import/Storage location in the virtual disks - storage is on the host machine.

File transfers are made by using proprietary WAN acceleration software that is proven to get 95% of the bandwidth available on UDP transfer.

File transfers will sometimes also be TCP or HTTP.

Maybe we did a few obvious errors or omissions in our allocation of resources or the configuration of our kit. However, it is very frustrating because the performance sometimes makes the virtual machine unusable.

I'm after pointers as to what we must try to work again then, or what we should have checked that we do not have. Thank you!

Detail:

Model of host machine:

HPDL360

Intel Xeon 5504 (2.0 GHz) with 4 cores

4Gio RAM

Records of host machine:

2 x 330 GB SAS

RAID 1

(NB would have previously implemented us a host with the specifications below using 2 × 500 GB 7 .2kRPM SATA disks but became poor i/o performance, so we increased the specification according to retail but still see questions.)

Type of disk controller:

HP P410i RAID built-in, no cache or battery

Available called bandwidth:

100 Mbps

ESXi version on the host: 4.1.0_260247

Virtual machines:

The host contains 4 VM.

Each virtual machine uses Centos 5.5 (2.6.18 - 194.32.1.el5)

set resource pools 4 up on the host, each containing a VM, each pool configured identically as follows;

CPU resources;

Actions: Normal (4000 in gray)

Booking: 1609 extensible MHz

Limit the 6500 Mhz (in gray) unlimited

Memory resources:

Actions: Normal

Booking: 3375 MB expandable

Limit 13500 unlimited (dimmed) MB

A VM in each pool, no resource options defined on the computer level or by default, the values apply as follows: allocation of resources;

Actions: Normal 1000 (in gray)

Reservation: 0 MHz

Limit 2000MHx unlimited

I've also attached a document with screenshots of the performance of the host and the VM that is involved in the transfer to show the fall of IO mi transfer performance. It can be reproduced to a certain extent.

You need a controller with battery backup write cache and this active (write), simple as that.  Perhaps there is also a duplex problem if expaining slow transfers of the box - check the ports on the switch and natachasery in vSphere Client all show good negotiation.

Tags: VMware

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    You can free up disk space (will also help get rid of the things that you do not use) through the following steps:

    Windows XP should take between 4.5 and 9 GB * with * an Office suite, editing Photo software, alternative Internet browser (s), various Internet plugins and a host of other things installed.

    If you are comfortable with the stability of your system, you can delete the uninstall of patches which has installed Windows XP...
    http://www3.TELUS.NET/dandemar/spack.htm
    (Especially of interest here - #4)
    (Variant: http://www.dougknox.com/xp/utils/xp_hotfix_backup.htm )

    You can run disk - integrated into Windows XP - cleanup to erase everything except your last restore point and yet more 'free '... files cleaning

    How to use disk cleanup
    http://support.Microsoft.com/kb/310312

    You can disable hibernation if it is enabled and you do not...

    When you Hibernate your computer, Windows saves the contents of the system memory in the hiberfil.sys file. As a result, the size of the hiberfil.sys file will always be equal to the amount of physical memory in your system. If you don't use the Hibernate feature and want to reclaim the space used by Windows for the hiberfil.sys file, perform the following steps:

    -Start the Control Panel Power Options applet (go to start, settings, Control Panel, and then click Power Options).
    -Select the Hibernate tab, uncheck "Activate the hibernation", and then click OK. Although you might think otherwise, selecting never under "Hibernate" option on the power management tab does not delete the hiberfil.sys file.
    -Windows remove the "Hibernate" option on the power management tab and delete the hiberfil.sys file.

    You can control the amount of space your system restore can use...

    1. Click Start, right click my computer and then click Properties.
    2. click on the System Restore tab.
    3. highlight one of your readers (or C: If you only) and click on the button "settings".
    4 change the percentage of disk space you want to allow... I suggest moving the slider until you have about 1 GB (1024 MB or close to that...)
    5. click on OK. Then click OK again.

    You can control the amount of space used may or may not temporary Internet files...

    Empty the temporary Internet files and reduce the size, that it stores a size between 64 MB and 128 MB...

    -Open a copy of Microsoft Internet Explorer.
    -Select TOOLS - Internet Options.
    -On the general tab in the section 'Temporary Internet files', follow these steps:
    -Click on 'Delete the Cookies' (click OK)
    -Click on "Settings" and change the "amount of disk space to use: ' something between 64 MB and 128 MB. (There may be many more now.)
    -Click OK.
    -Click on 'Delete files', then select "Delete all offline content" (the box), and then click OK. (If you had a LOT, it can take 2 to 10 minutes or more).
    -Once it's done, click OK, close Internet Explorer, open Internet Explorer.

    You can use an application that scans your system for the log files and temporary files and use it to get rid of those who:

    CCleaner (free!)
    http://www.CCleaner.com/
    (just disk cleanup - do not play with the part of the registry for the moment)

    Other ways to free up space...

    SequoiaView
    http://www.win.Tue.nl/SequoiaView/

    JDiskReport
    http://www.jgoodies.com/freeware/JDiskReport/index.html

    Those who can help you discover visually where all space is used.  Then, you can determine what to do.

    After that - you want to check any physical errors and fix everything for efficient access"

    CHKDSK
    How to scan your disks for errors* will take time and a reboot.

    Defragment
    How to defragment your hard drives* will take time

    Cleaning the components of update on your Windows XP computer

    While probably not 100% necessary-, it is probably a good idea at this time to ensure that you continue to get the updates you need.  This will help you ensure that your system update is ready to do it for you.

    Download and run the MSRT tool manually:
    http://www.Microsoft.com/security/malwareremove/default.mspx
    (Ignore the details and download the tool to download and save to your desktop, run it.)

    Reset.

    Download/install the latest program Windows installation (for your operating system):
    (Windows XP 32-bit: WindowsXP-KB942288-v3 - x 86 .exe )
    (Download and save it to your desktop, run it.)

    Reset.

    and...

    Download the latest version of Windows Update (x 86) agent here:
    http://go.Microsoft.com/fwlink/?LinkId=91237
    ... and save it to the root of your C:\ drive. After you register on the root of the C:\ drive, follow these steps:

    Close all Internet Explorer Windows and other applications.

    AutoScan--> RUN and type:
    %SystemDrive%\windowsupdateagent30-x86.exe /WUFORCE
    --> Click OK.

    (If asked, select 'Run'). --> Click on NEXT--> select 'I agree' and click NEXT--> where he completed the installation, click "Finish"...

    Reset.

    Now reset your Windows with this FixIt components update (you * NOT * use the aggressive version):
    How to reset the Windows Update components?

    Reset.

    Now that your system is generally free of malicious software (assuming you have an AntiVirus application), you've cleaned the "additional applications" that could be running and picking up your precious memory and the processor, you have authorized out of valuable and makes disk space as there are no problems with the drive itself and your Windows Update components are updates and should work fine - it is only only one other thing you pouvez wish to make:

    Get and install the hardware device last drivers for your system hardware/system manufacturers support and/or download web site.

    If you want, come back and let us know a bit more information on your system - particularly the brand / model of the system, you have - and maybe someone here can guide you to the place s x of law to this end.  This isn't 100% necessary - but I'd be willing to bet that you would gain some performance and features in making this part.

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