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Questions tagged [fault-tolerance]

89 questions
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Vmware Esxi Vcenter 6.7 Fault tolerance for VM is greyed out

I'm very new to VMWARE. I'm trying to do fault tolerance for one of my VMS on Vcenter 6.7 but the Fault tolerance tab is greyed out for some reason. I have to 2 esxi servers in my vcenter and both are within the same cluster that has HA and DRS…
random-xyz
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Optimal (fault-tolerant, low-cost) way to keep a Write-Ahead Log (WAL) in IaaS?

I am working on a greenfield project for a “cloud-native” DBMS, with “cloud-native” meaning that the guarantees (e.g. ACID) it makes will depend on the presence of certain backing IaaS services (e.g. object storage, managed message queues, etc.) The…
tsutsu
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Network fault tolerance for LAN clients

Goal: Provide fault tolerance for LAN clients so access to a service with a service-level agreement (SLA) is not interrupted in the event of an incident with a physical switch. Question: Is there a configuration which would provide fault tolerance…
Jack.L
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Is Setting up backup DNS only for A Record possible?

So we Have a server on AWS for our website and we use another provider for our e-mails. We have a backup policy in place where we have at least 3 places with all the data from our main server one of those is exactly the same webserver running our…
Jonathan DS
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Concrete difference between faults and attacks

I don't know if it is the good place to ask this question but I believe it is OK. My question is simple: how can one make a difference between a fault and between an attack? A denial of service could be cause by both, what may be considered as…
Ecterion
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Apache Mesos Master on every node

Is it good idea to launch mesos master and mesos slave together on every node? If no, how to calc number of master nodes?
Alex Ushakov
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Azure Traffic Manager fault tolerance

I have just answered Do I need Azure Traffic Manager with Azure API Services? Over on SO Part of my answer was understanding the failure of all aspects of a solution to which I realised I really don't understand the fault tolerance of Traffic…
Michael B
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vSphere High Availability, Fault Tolerance and Snapshots

I've heard claims from a vSphere server administrator that VMs configured for high availability continue to transparently function even in the event of an ESXi host failure. He also claims VMs configured for high availability cannot be snapshoted…
Michael
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pfSense CARP - WAN failure on firewall

I have recently configured 2 firewalls (on 2 DELL PowerEdge R210II with ESXI 5.1) with pfSense. We have several LANs and 2 WANs. Everything is running fine but I have a strange behavior: I can access the internet from all LANs but not from the…
eldblz
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VMware ESXi/vSphere Fault Tolerance vCPU Limit

So I am aware that VMs in FT mode are limited to a single vCPU. Is it possible to assign multiple cores to the single vCPU, and still have the VM support FT mode? Or are you forced to use both a vCPU and single vCore per FT VM?
Matt
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What Are VMware ESXi/vSphere Fault Tolerance Bandwidth Requirements

I plan on deploying a cluster of 2 ESXi/vSphere servers and having them run in fault tolerance mode. The virtual servers primarily be IIS & SQL. The physical servers will have a single Xeon E5-2697 (2.7Ghz 12 Core) CPU, 64GB RAM and dedicated…
Matt
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Microsoft licensing in a virtualized environment questions

I plan on deploying two physical servers which will run VMware ESXi and have a number of questions regarding Microsoft licensing. To note, all the VMs on the servers will be configured to run in ESXi's fault tolerance mode. This means that all the…
Matt
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Can I control which DNS record a client application uses?

I'm trying to make our set of servers more fault tolerant. I have a web server, a mail server and a PBX server that uses SIP. I know that for each service, I can have the DNS return multiple A, MX and SRV records respectively. However I'm not…
graf_ignotiev
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RAID 5 - DELL 2850 and others

I have installed Ubuntu on a DELL 2850 and I have configured an array of 5 disks (SCSI 73GB 10K) in RAID5. I wanted to simulate a drive error so in the middle of something I just took one of the drives out and put it back again after a bit. Then the…
Kiara
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webserver cluster serving web content using a SAN still results in a single point of failure

I'm looking for a better way of doing things than using a SAN lun mounted to multiple webservers as a way of keeping data in sync. The applications require instantaneous or near instantaneous synchronization between webservers to function, and can't…
user1238763
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