AHV Virtualization

Webscale Virtualization for the Enterprise

  • 572 Topics
  • 1,912 Replies

572 Topics

J
JukkaFINVoyager
asked in AHV Virtualization

Nutanix CVM - diskspd

I’m new to Nutanix and we have a Nutanix cluster online. For testing purposes I’m running diskspd test in a VM.I’m running some diskspd test with identical VM configs in several enviroments 3-tier Hyper-V/ VMware and HCI Nutanix AHV.Why is it that running a test with -Sh flag (no software/hardware cache) gives almost 10 times lower results in Nutanix compared to other platforms? Without -Sh flag Nutanix is running test with higher results compared to my other testing platforms. Is it because of how CVM is designed to work? I’m just trying to understand.

3
Alona
Nutanix Employee
3 years ago
M
MarvinBAdventurer
asked in AHV Virtualization

Determining appropriate methodology for cpu over subscription

We are new to Nutanix. We are migrating from ESXi to AHV.  We currently have some level of CPU oversubscription in place on ESXi.  We anticipate the need to oversubscribe CPU on some clusters and I am looking for ways to do this safely.  I’ve looked in the Best practices guide but there was very little there.  Any help would be appreciated.

3
Sergei Ivanov
Nutanix Employee
3 years ago
A
Andrew_ussVoyager
asked in AHV Virtualization

Memory Consumption Report

Hi,We have PRISM Central Pro license and I’d like a report or Analysis view on which virtual machines are consuming the most memory. The Cluster in question is VMware 6.7. Is this possible and what is the best way to go about it?

2
A
3 years ago
G
Gregg_ITXVoyager
asked in AHV Virtualization

Nutanix lock a VM

Good afternoon, all!I’m setting up a new PKI infrastructure in a Nutanix cluster and I want to shut down the root CA for safekeeping. Is there a way to add some safeguards so that the VM can’t be started inadvertently?

3
Alona
Nutanix Employee
3 years ago
H
HasVoyager
asked in AHV Virtualization

Easy way to put Vmware ESXi host into maintenance mode.

I know there’s another topic like this but, it is 3 years old. Is there an easy way to put a single ESX host into maintenance mode?Not to compare products but with Cisco Hyperflex, you right-click on the host and there’s a “Hyperflex maintenance mode” option.  This does what needs to be done to the CV without having to SSH into anything.I was just wondering if the process has improved in 3 years.

5
H
3 years ago
Sayo
SayoAdventurer
asked in AHV Virtualization

I cannot expand the cluster.

Hi,I cannot expand the cluster when Pre expand-cluster tests were failed and error message was "Failure in pre expand-clustrer tests.Errors:Failed to get vlan tag of node:XXXXX" on Prism Element.CVM and HyperVisor Network use Tagged VLAN and PortChannel in L2 switch ports.Ping to HyperVisor’sManagement IP from other NW segment is OK.Of course, CVM and HyperVisor’sManagement IP are same segment.Should  I do any other? As below, each of versions.・DELL XC640・AOS：5.10.6・ESXi：6.7 Update 2 (Build 13006603)

8
H
3 years ago
C
CESCPathfinder
asked in AHV Virtualization

Windows 2019 Standard edition guest OS licensing on AHV

Hi, We have deployed couple of guest VMs on Windows 2019 Standard Edition OS on our 6 node cluster. Both the guests are configured with 1 VCPU with 2 cores along with 16 & 32 memory respectively. We have procured standard paper license of the OS. The hypervisors are running on AHV version 20170830.337 & AOS - 5.10.8.1 LTS. Is there any specific licensing model for Windows Server OS to run on AHV? How are the Windows licenses determined? Kindly help.

3
M
3 years ago
jonas.hogman
jonas.hogmanTrailblazer
asked in AHV Virtualization

PrismCentral 2020.9.0.1 cant delete Project

Hi! have a Project in Prism Central that's acting wierd.When i try to update the Project trough GUI i get this error message:Edit conflict: please retry change.Notification { "api_version": "3.1", "code": 409, "kind": "project_internal", "message_list": [ { "message": "Edit conflict: please retry change.", "reason": "CONCURRENT_REQUESTS_NOT_ALLOWED" } ], "state": "ERROR" }So i connect with SSH to a PC CVM, and try to delete the project trough nuclei,<nuclei> project.delete Project \Name confirm=trueConfirm deletion of project? (yes/no) yes{ "message":{ "kind": "project","code": 409,"message_list":[ { "message": "Edit conflict: please retry change.", "reason": "CONCURRENT_REQUESTS_NOT_ALLOWED" } ],"state": "ERROR", "api_version": "3.1" } }It is only the specific project that has this problem, other projects works just fine. I have searched KBs but cant find anything. The ncc health_checks run_all are not showing up anything suspicious.  I have also opened a case on this error!

1
jonas.hogman
3 years ago
Sayo
SayoAdventurer
asked in AHV Virtualization

Cloud Connect needs NTP sync?

Hi , Could you advice me  ?Now, Hypervisor and CVM is NOT syncronized from NTP Server.I use CloudConnect everyday , but that was failed.Is CloudConnect faiure reason relevent to NTP Server unsyncronization? TestConnect is OK from Onpresmiss Cluster to AWS.I read this;https://portal.nutanix.com/page/documents/details?targetId=Web-Console-Guide-Prism-v5_17:wc-cloud-connect-wc-c.htmlSincerely, 

1
Alona
Nutanix Employee
3 years ago
M
MrMikeTrailblazer
asked in AHV Virtualization

AD domain controller disaster recovery question

Just curious how other users running AHV plan their ad disaster recovery?  AHV does not support VM-Generation ID so it looks like the most straight forward method not including additional software would be to use the builtin server backup to backup and restore at least the server with the fsmo role.  I wonder what happens in a protection domain scenario especially if there are multiple servers.  Seems like there could be usn rollbacks issues.  Any input on how others are doing it would be appreciated since the documentation seems to be scarce for AHV.

1
Alona
Nutanix Employee
3 years ago
Sayo
SayoAdventurer
asked in AHV Virtualization

Cloud Connect AWS is failed.

Hi, I am always taken care. I use CloudConnect by VPN connection to AWS and enable NW compression.Everyday repeat that.Since 1 year ago, All PDs are failed. below the message on Prism ;---Replication was skipped for protection domain XXXX of snapshot (X,X,X) to remote site XXX. Replication was skipped as a newer snapshot was available.---I executed cli on CVM, replication statuses are “Sending” .---$ncli pd list-replication-status Replication Operation     : Sending And I did “Test Connection” on Prism was “OK”. What do you think this reason? Sincerely,

3
Sayo
3 years ago
Sayo
SayoAdventurer
asked in AHV Virtualization

upgrade Hyper-V 2012R2 to 2016 on XC630

Hi,I am always taken care.I'll upgrade Hyper-V 2012R2 to 2016 on XC630 so I have some questions.・metadata(json) download from Nutanix Portal. Can I do that Hypervisor ISO file there ?・What difference are metadata(json)  each ? ・Use Hypervisor ISO file of Evaluation version, is it OK?・ISO's language adapt any languages? or English only? Sincerely,

3
Sudhir9
Nutanix Employee
3 years ago
Sayo
SayoAdventurer
asked in AHV Virtualization

AsyncDR need vCenter?

Hi,I use vSphere6.0 U3 on NX series and set AsyncDR replication to AWS.Some protection domain’s AsyncDR are errorred after VCSA has broken and re-deploy.Are AsyncDR and vCenter  depend on each ?Sincerely,

2
Sayo
3 years ago
B
BlakeRobertsNBLAdventurer
asked in AHV Virtualization

Finding VM Disk Ownership in AHV

Hi,Our 3rd party backup software does a poor job of cleaning up vdisks off of a proxy after it does its backups.  Many times, it will leave the vdisk from a snapshot mounted to its proxy server and not delete it.  This is a known issue that has been brought up with the vendor (Quest NetVault).  Our question is, what is the easy way to see what disks are owned by the proxy VM and what disks are owned by a snapshot image?  We want to be sure we don’t remove a disk that is owned by the proxy server.Thanks,

1
Alona
Nutanix Employee
3 years ago
T
TRABELSIVoyager
asked in AHV Virtualization

DR Scenario and stop auto power on VM AHV

i have two quetion for our scenario : we have to AHV clusters production and  DR.in our scenario we need to stop the main be active after powered on when resolve the issue becouse if the main server goes down the DR will be active and after resolve the issue the two cluster will be active active?Q2: How to stop auto power on for VMs on AHV ?that means when the main site be on after solve the issue I do not need the VM powered on automaticlly.. I need to power it manually. 

4
Alona
Nutanix Employee
3 years ago
joshodgers
Nutanix Employee
joshodgersNutanix Employee
posted in AHV Virtualization

Best practices for VMware vSphere HA

The following tables show the recommended configuration of VMware High Availability. [b]Admission Control[/b] [img]https://d1qy7qyune0vt1.cloudfront.net/nutanix-us/attachment/254iFA487A2BE0AAFA9C.jpg[/img] The below table shows the percentage values required for N+1 through N+4 availability for vSphere clusters of up to 32 (The Current maximum cluster size for vSphere 5.5). The green highlighted values represent recommended values based on the level of availability. [img]https://d1qy7qyune0vt1.cloudfront.net/nutanix-us/attachment/252i8C02D4957E9FFBB5.jpg[/img] In Summary the recommendations are: [list] [*]Cluster of =N+1 redundancy [*]Cluster of >8 & =N+2 redundancy [*]Cluster of >16 & =N+3 redundancy [*]Cluster of >24 & =N+4 redundancy[/list] [b]Host Isolation Response and Advanced Settings[/b] [b][img]https://d1qy7qyune0vt1.cloudfront.net/nutanix-us/attachment/256i1A83A331F6F3317D.jpg[/img][/b]

2
B
3 years ago
L
LMeyerovPathfinder
asked in AHV Virtualization

Stack for Nvidia Docker GPU compute?

We’re standing up some docker-based Nvidia GPU compute workloads for the rapids.ai ecosystem for replacing/accelerating Spark & friends. However, we’re lost in Nutanix GPU virtualization docs, so curious if folks have ideas on the pieces for nutanix to work here. Right now, we’re thinking P100/V100 GPU → ahv / esxi → rhel 8.x → docker, and as an optional reach target, see if we can guest multiple host OS’s to share the same GPU(s). We’ve successfully done GPU → Ubuntu+RHEL → docker, but without ahv/esxi in the mix.  Most ahv+esxi gpu articles seem more about VDI than compute, so we’re uncertain. Experiences? Ideas? Tips?

1
B
Nutanix Employee
3 years ago
A
agExplorer
asked in AHV Virtualization

DWDM connection

We have the following senario at one of our customersIn the core there are 4 VSP8400 connected in a square. Two of the devices are in a Geo Redundant Datacenter.Between the links is an Extreme L2 SPBm fabric.Between the data centers the connections run over active DWDM devices.A measurement showed that if I deactivate a DC connection in the core, it takes about 400ms until the opposite interface reacts over the DWDM connection and also goes down.In the 400ms, however, traffic will still run over the link to nothing.Now my question:Do you see a problem on the Nutanix side if the switching time is 400ms or are there possibilities to adjust the sensitivity (buffer) of the Nutanix Datastore synchronization to the circumstances? 

1
Neel Kotak
Nutanix Employee
3 years ago
P
PierreragainassAdventurer
posted in AHV Virtualization

HyperV/Nutanix (SMB), VM import from Hyper-V manager

Hi, I'm trying to import a VM using hyper-V manager but it is always saying "can't access folder, you might have not permission to access this folder" and tried to check all VMs and the same issue shows up. Any idea why this error is there? I'm thinking about modifying the permissions on VM folder, can we? knowing that i'm trying to access the VM folder from container share path [example: \container_name.........] We are running hyperV2012R2 on nutanix 4.7.1 Thank you, Pierre

7
J
3 years ago
Mark Chojnacki
Mark ChojnackiExplorer
asked in AHV Virtualization

Application-consistent VM snapshots for recent versions of RHEL, CentOS, Windows Server

We are looking to do application-consistent snapshots of VMs running recent releases of RHEL, CentOS and Windows Server on AHV. However, the following document indicates that releases such as RHEL 7.4+, CentOS 7.4+ and Windows Server 2019 are not yet supported: Conditions for Application-consistent SnapshotsIs anybody having any issues with application-consistent snapshots for these releases? Some of these OS versions are not even that recent - RHEL 7.4 was released in August of 2017!

0
Mark Chojnacki
3 years ago
D
Don TeunWayfarer
asked in AHV Virtualization

Windows 2012 on AHV. After reboot it is not able to detect vdisk

Operating System : MS Window 2012 serverHypervisor : AHVIssues :A windows server with the above mentioned OS is running on Nutanix Cluster (AHV). The VM is not able to access via the PE while launch console it show a black screen. However, its still able to RDP into the server and the applications is still be able to access. But after awhile i presume all services went down and the above is not viable anymore. Have to hard reset the VM, after which the virtual machine power up and its not able to detect the virtual disk (the virtual disk is still physically within the cluster). Have to repair the operating system and reinstall the virtio drivers to recover the disk. This happen often, can i check if there are anyone who have experience it and also have a resolution to it. I have did some research online. Seem like its the VirtIO having problem . Will need to install the latest KVMnet drivers but i do not if this actually applies on AHV (as its based out on KVM) . Appreicate any inputs

1
Neel Kotak
Nutanix Employee
3 years ago
A
angeessanAdventurer
asked in AHV Virtualization

Virtual Machines automatic restart on AHV

Hello All, I have 01 NX-1065-G6 block including 3 nodes. AOS Version : 5.10.5 AHV Version : 20170830.279 After a power outage, I would like virtual machines to start automatically in a predefined order; for instance, domain controller first, Exchange server secondly, and so forth... With ESXi I can do this in a very simply manner. How to do this with AHV ? Please help. Thanks.

3
B
3 years ago
P
Peter_1966Voyager
asked in AHV Virtualization

dedicated CPU allocation

Hi, I'm a little bit new a Nutanix, however since last summer I can handle it very well Now I got a question wich I want to share here. I have to prepare a windows server. The requirments of the software wich will be hosted on this server preverene dedicated CPU and memory. So is this in the nutanix (AHV) installation posible to create a VM with his own dedicated CPU's (6cores) and memory?   Regards Peter

2
V
3 years ago
V
Vladimir13Adventurer
asked in AHV Virtualization

VM memory dump creation procedure for Acropolis (VM)

HelloI am interested in the possibility to get a VM memory dump for further analysis (list of processes, sockets, other artifacts). How to do it if using the KVM hypervisor (Acropolis).I need to create a dump on a running VM for analysis. A detailed description of the procedure is required. If I understand correctly, all VMs in Nutanix are kept in the form of files, which files are VM dump files? Оr does Nutanix have a special procedure for creating and downloading a complete dummy file(s) of a virtual machine?OS doesn't matter, it can be anything.Please tell me the information to understand this issue.

6
Sergei Ivanov
Nutanix Employee
3 years ago
Alona
Nutanix Employee
AlonaNutanix Employee
posted in AHV Virtualization

Tweaking performance of vNICs on VMs

​Processing power doubles endlessly, it seems, and become less and less expensive. Applications, at the same time, are developed with less of resources efficiency in mind and thus demand more and more resources. And so the spiral grows. While in most cases it is not an issue and performance is not impacted in some instances you have to squeeze performance out of your environment. Possible scenarios include:VMs or applications where traffic packets are relatively large. VMs/apps with multiple concurrent connections, where network traffic moves between guest VMs on the same host, guest VMs across hosts or to the hosts themselves, or from guest VMs to an external system. To provide relief to vNIC RX packet drop rate increases (per KB 4540 - Handling packet drops from vNICs in AHV) where CPU contention of guest/host has already been ruled out.For those particular instances, there is a solution. This is not a “turbo” button. Do not use this for all your VMs. Rule out other sources of conten

0
Alona
Nutanix Employee
3 years ago

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