Virtualization, Cloud, Infrastructure and all that stuff in-between

My ramblings on the stuff that holds it all together

Category Archives: ESX 3.5

vSphere RC RAM Under VMware Workstation: How Low Can You Go?

 

Getting ESX (in it’s various versions) to run under VMware Workstation has proven to be a very popular article on this blog, if you are a consultant who has to do product demos of VI3/vSphere or are studying for your VCP it’s a very useful thing to be able to do on your own laptop rather than rely on remote connections or lugging around demo kit.

Good news; the RC build of vSphere will boot under the latest VMware Workstation build (6.5.2) without any of the .vmx hackery you had to do in previous versions and it seems quite fast to boot.

Bad news: the RC build of vSphere needs at least 2GB of RAM to boot, this is a problem for a laptop with 4GB of RAM as it means you can only really run one at a time.

Luckily: Duncan Epping (or VCDX 007; licenced to design :)) has discovered how you can hack the startup script to allow it to run in less than 2GB of RAM – details here, this isn’t officially supported – but it does work.

In the interests of science I did some experimentation with VM’s with various amounts of decreasing RAM to see what the bare minimum RAM you can get away with for a VM’d version of vSphere RC.

The magic number seems to be 768Mb of RAM, if you allocate less than this to the VM then it results in a Purple Screen of Death (PSOD) at boot time.

image

Note – this may change for the GA/RTM final version – but these are my findings for RC

The relevant section of my /etc/vmware/init/init.d/00.vmnix file looks like the following (note it won’t actually boot with 512mb assigned to the VM)

image

Some screen captures of the vSphere RC boot process below

image image

And finally the boot screen once it’s finished – it takes 2-3 mins with 768Mb of RAM on my laptop to get to this boot screen.

image

I am doing this on a Dell D620 with 4Gb RAM and Intel VT enabled in the BIOS, running Vista x86 and VMware Workstation v6.5.2 build 156735

image 

image 

I haven’t tried, but I assume I can’t power on VM’s under this instance of vSphere but I can connect them to a vCenter 4 machine and practice with all the management and configuration tools.

Happy tweaking…

About these ads

PSOD – Purple Screen of Death

Just incase you ever wondered what it looks like here is a screendump..

this is the VMWare equivalent of Microsoft’s BSOD (Blue Screen of Death)

image

I got this whilst running ESX 3.5 under VMWare Workstation 6.5 build 99530, it happened because I was trying to boot my ESX installation from a SCSI hard disk – which it didn’t like – I assume because of driver support, swapped for an IDE one and it worked fine…

update – actually the VM had 384Mb of RAM allocated and that’s what actually stopped it from booting.. upped to 1024Mb and it runs fine.

Its the first time I’ve seen one – all the production ESX boxes I’ve worked with have always been rock-solid (touch wood)

I’m preparing a blog post about unattended installations of ESX when I hit this, in case you were wondering.

VMWare/Cisco Switching Integration

 

As noted here there is a doc that has been jointly produced between VMWare and Cisco which has all the details required for integrating VI virtual switches with physical switching.

Especially handy if you need to work with networking teams to make sure things are configured correctly to allow failover properly between redundant switches/fabrics etc. – it’s not as simple as it looks, and people often forget the switch-side configurations that are required.

Doc available here (c.3Mb PDF)

Can you run ESX as a VM under ESX?

 

Crazy, yeah – but hey you’ve got to try it, prompted by a question from Prasad – can you run ESX in a VM under ESX?

In the interest of science I just tried this, I used VM Convertor to convert my working ESX under workstation image as-is to my ESX box (hoping it would keep the custom settings intact, and saving me from having to rebuild it)

good news, the VM converter did it’s thing and it does start up on the ESX box.

..bad news, it doesn’t get past  this screen as far as I can tell…it’s sat there for a good 20mins so I don’t think its going to get much further.

image

Also tried to import my ESX 3i image to see if that would work, but VM Convertor wouldn’t import it for some reason, so will have to try a clean install on that.

image

Looks like some kind of error when it’s trying to determine what version it is..

[2008-06-13 00:23:29.164 'P2V' 5748 error] [task,295] Task failed: P2VError UNKNOWN_METHOD_FAULT(sysimage.fault.OsVersionNotFound)
[2008-06-13 00:23:29.164 'P2V' 5748 verbose] [task,339] Transition from InProgress to Failure requested
[2008-06-13 00:23:29.164 'P2V' 5748 verbose] [task,388] Transition succeeded

Ah well, anyone know how to get this going/if it’s possible?

Slow vMotion..

 

Note to remember, don’t forget to check the duplex settings on NICs handling your vMotion traffic.

My updated clustered ESX test lab is progressing (more posts on that in the next week or so)… and I’m kind of limited in that I only have an old 24-port 100Mb Cisco hub for the networking at the moment.

vMotion warns about the switch speed as a possible issue.

image

I had my Service Console/ vMotion NICit forced to 100/full and when I 1st tried it vMotion took 2hrs to get to 10%, I changed it to auto-negotiate whilst the task was running and it completed without breaking the vMotion task ain a couple of seconds, dropped only 1 ping to the VM I moved.

Cool, it’s not production or doing a lot of workload but useful to know despite the warning it will work even if you’ve only got an old hub for your networking, and worth remembering that Duplex mis-matches can literally add hours and days onto network transfers.

Running ESX 3.5 and 3i Under VMWare Workstation 6.5 Beta Build 91182

 

Following on from my earlier post I upgraded my installation to the new build of 6.5. it un-installed the old build and re-installed the latest without a problem, took about 30mins and required a reboot of the host OS.

All my previously suspended XP/2003 VM’s resumed ok without a restart but needed an upgrade to the VMTools which did require a restart of the guest OS – all completed with no problems.

Now, onto installing ESX….

I used the settings from Eric’s post here to edit my .vmx file

ethernet0.virtualDev = “e1000″

monitor.virtual_exec = “hardware”
monitor_control.restrict_backdoor = “true”

Note – you need to select an x64 Linux version from the VM type drop down, if you have to go back and change it via the GUI after you’ve edited the .vmx file it overwrites the Ethernet card “e1000″ setting to “vlance” so you need to edit again otherwise the ESX installer won’t find a compatible NIC and won’t install.

it was initially very slow to boot; 5mins on my dual core laptop with only one error – which was expected..

imageimage

To improve the performance I changed my installation to run the non-debug version of the Workstation binaries (rename the vmware-vmx.exe to vmware-vmx-debug.exe)

note: this isn’t recommended unless you know what you are doing, VMWare will rely on the output from the debug version of the code if you need to report any issues)

It also seems to work for the installable version of ESX 3i… (although I’ve not quite figured out the point of that version yet :)).

image

Install prompt

image

it did fail with an error the 1st time round..

image

this was because I had specified an IDE disk as per the ESX instructions, I changed it to a SCSI one and it worked ok.

image

Finished..

imageimage 

The ESX 3i install has a footprint of about 200Mb on disk, and ESX 3.5 uses 1.5Gb.

I’m going to keep the 3.5 install on my laptop and will try to use linked clones to maintain a couple of different versions/configs to save disk space.. I’m sure I could knock up a quick script to change the hostname/IP of each clone – if I do I’ll post it here.

Why would you want to do this? well because you can, of course :) and its handy for testing patch updates and scripts for ESX management etc.

I will  also try to get a ESX DRS cluster running under workstation with a couple of ESX hosts and shared storage over iSCSI using something like OpenFiler as shown here. won’t exactly be production performance, but useful for testing and demo’ing.

Follow

Get every new post delivered to your Inbox.

Join 2,041 other followers