Quantcast
Channel: Hyper-V forum
Viewing all 19461 articles
Browse latest View live

Disk caching on host or guest?

0
0

OK, this is probably a noob question, but if we have 64GB RAM on our HyperV (2008R2) host, and we are running disk intensive software, do we:

a) Allocate the 'minimum' RAM to the guest, and leave the rest for the host to use for disk caching, or

b) Allocate the maximum RAM to the guest (leaving 1GB for the host), and let the guest use it for disk caching?

Allocating half & half would seem to be a waste as they will probably both end up caching the same data (will they?), but it's not clear whether we're best letting the host or the guest do the caching. Or does it actually matter at all?

I've had a good look around and haven't been able to find any relevant recommendations.

More Info - the 'disk intensive' software is mainly a PostgreSQL server. We'll give that about 8GB for its shared buffers, but it seems to be recommended to use OS disk caching beyond that. There is a 1GB BBWC P420i RAID controller so write caching is performed on that. Currently, our biggest performance bottleneck seems to be due to uncached reads, so we are increasing the host RAM from 16GB to 64GB (and adding an SSD for index storage), but just want to know whether it's best to increase the guest RAM allocation, or leave it 'spare' on the host.


"Mouse Not Captured In Remote Desktop Sesion" in Hyper-V

0
0

This is a silly little problem, but on my 2008 server I installed a Hyper-V virtual machine (a Win 2008-64 system), and I can't get it to capture the mouse.

Integration services are installed and the mouse is listed but I can't capture it.  I've tried Ctrl Alt right arrow.....

I'm used to VmWare and this is my first time with Hyper-V.

 

Moving/copying a VHDX to the Hyper-V machine?

0
0

Running 2012 R2 Hyper-V core managed via a Windows 8.1 desktop. Used Disk2VHD to convert a laptop. But I am unable to import the file (VHDX) into the Hyper-V via the import function, does not see the file nor am I able to copy/move the file to the Hyper-V machine to create a new VM with the VHDX file.

Any ideas on how to do this?

VSS Writer wont online backup

0
0

We run Hyper-v on Server 2012 and have an issue with the vss writer not using online backup.

When we were running 2008R2, we had the same problem, but only with a couple of VM's, now we have gone to 2012 Hosts we have about 12 VM's that wont backup in online state.

When I list writers, it shows "Backup Using Saved State" for the VM's under Microsoft Hyper-v VSS Writer, so it would be a Hyper-v problem and not with DPM.

I have checked the Microsoft list of reasons when you cannot perform an online backup, but none of those apply.

How can I diagnose what is preventing the Hyper-v VSS Writer perform online backup?

Reinstall Hyper-V

0
0
Can you uninstall the Hyper-v role and then re-install it without damaing the virtual machines on the server?  We are running Windows Server 2008 R2. Thanks.

creating snapshots in Hyper-V manager 6.3

0
0

Hi, 

Please bare with me .. After reading many blogs, articles on snapshots.. few say it is not recommended to take snapshots and so on ..I have many doubts on this snapshot feature. ... so coming back to the expert gurus

we would like to take snapshots of some of our guest VM's.

Host OS : Hyper-V Server 2012 R2

Guest OS : windows Server 2008 R2 SP1

VMM Version : 6.3.9600 

I don't see the snapshot option in this version of VMM..but I can see checkpoint option ...this is the snapshot option right ?

does the snapshot and checkpoint perform the same action ?

for creating the snapshot/checkpoint is it better to shutdown the VM or can we take it while the guest VM is running (guest VM has SAP/Exchange application running on it).

while I was checking on few threads,they say snapshot will be created in the same directory where the VHDX file is located .. can we create the snapshot in a different location ? which is the recommended one?

What would be size of snapshot/checkpoint file after creating one? will it be the same as the the VM ?

We have planned for a backup solution for hyper-v but yet to implement. As a requirement for one of the server to go live ,to be on safer side we would like to take snapshot of that VM.

Could you please explain me about the merge process,does all scenario need the merge process.How this works ?

Thanks for reading this thread. Thanks again





Which Server Version for Domain Controller do I Need

0
0

Hello

We are currently running two domain controllers with Server 2003 on them.  We have a standard TCP/IP star topology networking  including web servers, files servers, sql, iis etc.

We are upgrading 5 of our servers to 2012r2 and are using them as "host" servers for upgraded IIS (2012r2) and WebGrabber (2008r2) servers and these servers will be set up as virtual machines (the IIS and web grabbers) on the hosts.

My question is will using Windows Server 2003 domain controllers cause issues in the advanced settings in 2012r2 and Hyper-V?  Should we upgrade our Domain Controllers and if so to what version?  2008r2 or 2012r2?

Thanks!

Theresa Greene


Theresa Greene

Lots of Warning 1706 logged on VMM 2008 R2 Sp1

0
0

Hi,

I have VMM 2008 R2 Sp1 server with 3 Hyper-V hosts connected. In VM Manager event log I have noticed lots of 1706 warnings logged recently:

"Job <Id> (Refresh virtual machine) failed to complete" and

"Job <Id> (Refresh host) failed to complete"

Could anyone help me with this? How to troubleshoot this problem?


Hyper-V 2012 Synthetic Fibre Channel

0
0

I'm seing event 32213 in Hyper-V SynthFC logs on my 3 host cluster.

Event 32213
No LUNs have appeared for Synthetic Fibre Channel HBA Fibre Channel Adapter. The VM has been started after the timeout period (90 seconds). Please review the LUN mappings for the virtual port. (Virtual machine ID)

My VM can no longer see the shared storage. I'm looking for information regarding this warning.

My environment consists of:
3 node cluster running Windows 2012
VM is running Windows 2008R2. This VM is part of a 2 Node SQL cluster. The other node in the cluster can see the storage.

Any assistance with this issue would greatly be appreciated.
Thank you!

Converged Fabric without Storage Traffic

0
0

I have a DataOn 9220 CiB. 2 nodes, each with a dual-port 10gb nic going to a single 10g switch. They also have a 1g nic connected internally directly to eachother. Storage is via direct SAS connection to internal dual-port drives, setup as CSVs. I'm not creating a SoFS. These two nodes have tons of RAM and will be the Hyper-V compute nodes, accessing the SAS drives directly.

What's the best way to setup my converged network fabric, considering I don't have any storage traffic on it?

I've been playing with some configs. Mostly teaming the two ports on the dual port 10g nic in dynamic switch independant mode. Then creating vlans for mangement and live migration. What am I missing, and what should the QoS settings on each vlan be? How could I best leverage the 1g node-to-node internal connection?

(I'll eventually have another 10g switch for redundancy) Thanks.

adding a partition to the existing harddisk

0
0

Hi,

I created a VM with 80GB VHDX ( this is the only partition C drive ) and installed OS on that.Now I would like to create one more partition (D drive with 80GB). how can I do this ?

while creating the VM, on the host I created the vhdx in a folder eg. dcserver. Can I create the new vhdx or vhd on the same folder ?

Thanks in advance

Preferred Back-Up System

0
0

I am using a Hyper-V machine to host my Exchange 2010 system.

I am currently using Altaro Hyper-V back up.

I am not 100% confident in this system, and want to see what is the consensus to back-up Hyoer-V systems.

Thanks

Event ID 153 - The IO Operation at logical block address xxxx for Disk 3 was retried.

0
0

Hi,

I have my Exchange 2013 on Hyper V OS and Exchange installation is on one drive and mailbox database is on another HDD.

I am getting error on Exchange database HDD with warning

Event ID 153 Disk

Please help me to get rid of this warning, when warning occur my mailbox get disconnected.

The IO operation at logical block address 6c1a8 for Disk 3 was retried.

Please help me to get rid of this warning, when warning occur my mailbox get disconnected.

Networking issue

0
0

Hi,  Hoping somebody can help with this issue and have a solution.

I have a server located in a DC which is running hyper-v server. I have been give some IP's to use on the virtual servers which are on a /32. These IP's have been pushed to the NIC on the hyperv host. How do i get these to work on the virtual machines.

I have been trying many different things but i just can't seem to get it work.

Hoping somebody can offer some advice or point me in the right direction

Hyper-V Replica

0
0

Hello,

Can some one tell me if with hyper-V replica it is possible to restore a file from a replicated server like with veaam?

the aim is to be able in a transition situation to have access to backup history of files

the backup solution will come later

thanks for your help


External network - HyperV machine without internet access! :(

0
0

Hi,

I have setup a HyperV machine with an external virtual network in the virtual network manager...

An now the hyper v machine hase none internet access.

What I should do to setup an internet access to the hyperv machine?

Regards,

Loosing sporadically network connectivity on WS 2012 Hyper-V with NAT routing enabled

0
0

Hi, 

i am using Windows Server 2012 (Standard, English) as Hyper-V host. I do have a single vSwitch configured as "internal" network. 

If I configure RRAS as a NAT router (on the host) I  sporadically loose my network connection to the host. It works for a few minutes, sometimes for an hour, and without any obvious cause I loose my network connection/RDP session. 

I used that exact configuration for years in WS 2008 R2. I have no idea, what the root of the problem is. 

Thanks for your help in advance,

Thorsten

A port on the virtual switch has the same MAC as one of the underlying team members on Team Nic

0
0

Experts !

Windows 2012 R2 Cluster.

2 Physical NICs dedicated for Hyper-V data traffic. These two NICs are used to create a team using Windows teaming (Switch Independent + HyperV Port) and this teamed interface is used for HyperV Virtual Switch.

I am getting the below warning frequently.

Log Name:      System
Source:        Microsoft-Windows-MsLbfoSysEvtProvider
Date:          11/12/2013 1:37:55 AM
Event ID:      16945
Task Category: None
Level:         Warning
Keywords:      Classic
User:          N/A
Computer:      MSHVCLUSTER6N1
Description:
MAC conflict: A port on the virtual switch has the same MAC as one of the underlying team members on Team Nic Microsoft Network Adapter Multiplexor Driver
Event Xml:
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
  <System>
    <Provider Name="Microsoft-Windows-MsLbfoSysEvtProvider" Guid="{387ed463-8b1b-42c9-9ef0-803fdfd5d94e}" EventSourceName="MsLbfoProvider" />
    <EventID Qualifiers="32768">16945</EventID>
    <Version>0</Version>
    <Level>3</Level>
    <Task>0</Task>
    <Opcode>0</Opcode>
    <Keywords>0x80000000000000</Keywords>
    <TimeCreated SystemTime="2013-11-11T21:37:55.871565200Z" />
    <EventRecordID>4861</EventRecordID>
    <Correlation />
    <Execution ProcessID="4" ThreadID="6100" />
    <Channel>System</Channel>
    <Computer>MSHVCLUSTER6N1.INSIDEVIRTUALIZATION.COM</Computer>
    <Security />
  </System>
  <EventData>
    <Data Name="DriverObject">
    </Data>
    <Data Name="Member">Microsoft Network Adapter Multiplexor Driver</Data>
  </EventData>
</Event>

And while checking the Interface and MAC, the warning is true.

name                                                                   MacAddress
----                                                                      ----------
MANAGEMENT                                                     00-17-A4-77-00-6E
HEARTBEAT                                                          00-17-A4-77-00-6C
Ethernet                                                             00-17-A4-77-00-6A
LIVEMIGRATION                                                  00-17-A4-77-00-68
DATA-2                                                                00-17-A4-77-00-66
DATA-1                                                                00-17-A4-77-00-64
vEthernet (HCT-PRODUCTION-LOGICAL-SWITCH)                   00-17-A4-77-00-66
DATA-TEAM                                                          00-17-A4-77-00-64

While I did the same configuration using SCVMM for my Windows 2012 HyperV clusters, the fabric was deployed from SCVMM and hence the team and the virtual switch was just one. In the similar way, How should I do this with out SCVMM ?


Cheers ! Shaba

Templates in SCVMM 2008 R2 and SCVMM 2012 R2

0
0

Hi Experts,

I have few questions regarding VM Template creation using SCVMM.
1. What is the difference between VM templates in SCVMM 2008 R2 and SCVMM 2012 R2 ?

2. I could not see the three folders (Snapshots, Virtual hard disks and Virtual Machines) of SCVMM 2008 R2 template in a template created using SCVMM 2012 R2. Only the vhd files are present in the template. What about the config.xml file?

3. Can we customize the config.xml for our VM installations?

4. Do we need to sysprep a VM or vhd file before creating a Template ? If yes, how to do it ?

Thanks,
Saleem

Live Migration between AD Forests

0
0

Hello Everyone.

I would like to LiveMigrate a VM from HostA in AD Forest1 to HostB in AD Forest2.  There is a two-way trust established between the two AD Forests.  Does anyone know if this is possible?  I have not been successful.

Viewing all 19461 articles
Browse latest View live




Latest Images