The fault-tolerance tag has no wiki summary.
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2answers
54 views
Dell PERC H700 and 8 disk slots : what are my options to increase disk fault tolerance?
We've got a Dell PowerEdge T510 which has 8 disk slots in the front. It is currently utilising 6 of these slots, and the disks are controlled by a PERC H700 controller. The disks are currently running ...
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1answer
93 views
Advantage of Microsoft Cluster over Microsoft Network Load Balancer
Till recently, I assumed that Microsoft NLB worked at an OS/Machine level rather than an Application Level. i.e. the NLB just monitors heartbeats on the machine to check if machine is alive and then ...
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0answers
33 views
Simulating faults with a web proxy?
We have an application that may be doing something wrong when faced with an unreliable VPN connection to the server it communicates with, or the servers themselves are having issues
The VPN is not ...
4
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1answer
78 views
What TLDs should I use for my NS records for redundancy? (DNSSEC support required)
Question
As a general practice, is it a good idea to use multiple TLDs for the name servers?
How should I choose between which TLD would be a good candidate for being the root server for my NS ...
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2answers
155 views
Record DNS for 2 static ip - fault tolerance
i've a web server in a DMZ reachable from 2 different public static ip addresses provided by 2 different internet connection by 2 different ISPs.
I want to create a record let's say ...
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1answer
90 views
Why state is needed for keepalived
From the doc
! MASTER and BACKUP state are determined by the priority
! even if you specify MASTER as the state, the state will
! be voted on by priority (so if your state is MASTER but your
! ...
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1answer
42 views
Fault tolerance with a pair of tightly coupled services [closed]
I have two tightly coupled services that can run on completely different nodes (e.g. ServiceA and ServiceB). If I start up another replicated copy of both these services for backup purposes ...
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2answers
75 views
Stratus Servers vs Virtualised Machines as a High Availability Solution [closed]
I've been asked to do this as a presentation, but to be honest, either I've totally missed the point or am I being asked to compare an actual company i.e. Stratus against the concept of virtualising ...
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2answers
632 views
how to configure ISCSI fault tolerance in ubuntu 12.04 [closed]
how to configure ISCSI fault tolerance in ubuntu 12.04 Anyone has a tutorial or steps to?! thanks in advance knowing that initiator and server are ubuntu
4
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1answer
690 views
Azure Virtual Machines - what fault tolerance do they provide?
We are thinking about moving our virtual machines (Hyper-V VHDs) to Windows Azure but I haven't found much about what kind of fault tolerance that infrastructure provides. When I run VHD in Azure, ...
-1
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1answer
94 views
What's the best way to know if your web server goes down? [duplicate]
Possible Duplicate:
What tool do you use to monitor your servers?
I noticed my website only got 8 visitors today, which means it probably went down very early this morning and I never ...
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1answer
58 views
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 ...
4
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3answers
287 views
How to properly configure power redundancy for devices with only one power input?
Some devices, such as servers and high-end switches have dual PSUs/power inputs, which can then be hooked up to separate UPSes, which are hooked up to separate power circuits (correct so far, right?).
...
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2answers
1k views
What happens if an OpenStack cloud controller dies?
I've been reading up on OpenStack and how we can re-create an EC2/S3-style cloud for our internal development and I'm having a hard time finding information on how the OpenStack cloud controller ...
7
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2answers
374 views
Multi-site high availability
We have a SaaS application that we need to be highly available. We already have an expensive, well-maintained Hyper-V failover cluster, but today the datacenter where we host that cluster had a ...
2
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1answer
917 views
ClearOS - how to avoid getting stuck at a fsck message at boot?
I have had this happen a couple times - I have a ClearOS Enterprise 5.2 box, and due to a power outage or similar, it ends up showing an error at boot and saying that fsck needs to be run (I think it ...
1
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1answer
1k views
Redundant NFS on Amazon EC2
I'm interested in building two fault tolerant/redundant NFS servers with failover at Amazon EC2. I'm familiar with tools/technologies like DRBD, Heartbeat, etc. Does Amazon provide any specific way of ...
0
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1answer
438 views
Fault-tolerant KVM hosts
I'm going to create a simple virtual hosts infrastructure using QEMU+KVM. It is expected to be very simple, without clouds or any other cool things. Right now the only requirement is the ...
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2answers
488 views
keepalived questions (requirements, abilities, limitations)
1) What are keepalived's (physical/network) requirements? Does the two (or more) keepalived' nodes need to be connected to the same switch? (something related to broadcasting maybe).
2) Can ...
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1answer
44 views
Is the Blackberry “Move Server” command a reliable way to achieve redundancy?
BES supports moving more than one user in a domain to an alternate server as shown in the image below.
Does this mean I could achieve some level of redundancy by moving users from one BES server to ...
0
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2answers
734 views
haproxy failover with process monitoring?
I know some people are using keepalived and heartbeat for active/standby but what action is taken if the haproxy process were to die?
What would be nice is if the virtual IP would switch servers if ...
7
votes
3answers
788 views
Do I need a second RAID controller for fault-tolerance?
I have a server with 3 hard drives installed, and a total capacity of 6. We're planning to max it out, but our consultant also suggested getting a second RAID controller "for redundancy" to support ...
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0answers
139 views
Basic solution for IP address failover on Windows
I'm trying to find a basic solution that will allow an IP address to fail over from one Win2k3 server to a standby one. I've got my own programs that can detect when a failure has occurred and trigger ...
1
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1answer
132 views
True memory-synchronous write flushing — drbd protocol B-?
Is there a way in DRBD to make a real fully memory-synchronous cache? I might best explain substituting current explanation with my own one:
Protocol B. Memory synchronous (semi-synchronous) ...
1
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4answers
315 views
Stress test a server for simultaneous connection
I am trying to figure out a practical way to stress test a server for 300 to 600 simultaneous connections. Any advice?
Thank you everyone for the help. To be more specific (sorry I wasn't before) ...
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2answers
227 views
Can we run a mix of vSphere Standard and Advanced but still use Advanced features?
We have a vSphere cluster of 4 ESXi servers licensed for Standard. We want to purchase some Advanced licenses so that we can use the Fault Tolerance feature in vSphere, but we don't want to upgrade ...
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3answers
2k views
Fault-tolerant NFS?
Probably a FAQ but I haven't found anything useful after a while of searching:
Can I set up NFS in such a way that every single error (e.g. server CPU, hard disk, hd controller, network adapter, ...
3
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1answer
789 views
Keepalived not sending mutlicast advertisments
I have two systems, both VMs. The are configured to use Bridged networking. I am trying to get keepalived to manage ownership of a VIP - 10.190.1.230. I have tried two versions of keepalived-1.2.2 and ...
3
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1answer
330 views
SQL Server 2008 R2 100% availability
Is there any way to provide 100% uptime on SQL Server 2008 R2?
From my experience, the downtimes for the different replication methods are:
Log Shipping: Lots (for DR only)
Mirroring w. NLB: ~ 45 ...
1
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1answer
251 views
fault tolerant file systems
some filesystems like btrfs and lustre are marked as fault tolerant file systems in :
wiki:http://en.wikipedia.org/wiki/List_of_file_systems
what's meaning of fault tolerant file system at all? does ...
1
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2answers
164 views
Windows Server 2008 Enterprise edition (cluster's ip address)?
My question is first of all for guys who had experience with Windows Server 2008 R2 Enterprise edition. As i found i can bake cluster (Failover Cluster Nodes). This cluster gives me one ip adress. So ...
0
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3answers
495 views
Round robin DNS and fault tolerance (web service, windows 2008)?
What "Round robin DNS" services do you know/use? I am interesting in free and commercial variants. I have domain and a few ip addresses from each server. But i think that some servers (Windows Sever ...
4
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3answers
538 views
*nix CARP or VMWare Fault Tolerance?
We're experimenting with what VMWare called a "Fully Collapsed DMZ" on blade centre. Basically our DMZ goes straight into a vSwitch and all the security appliances are virtualised.
I've spent days ...
1
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1answer
391 views
VMWare FT, 10GbE, 4 NICs - possible?
I'm trying to investigate if VMWare FT will be available in the following networking configuration.
We have 4x 10GbE NIC's, two of which are for the MPIO iSCSI networking, which leaves 2x NICs for ...
3
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2answers
388 views
Best option for HA between remote datacentres?
We're reviewing the system requirements that a new client has brought to us. They work in the medical field and the system they want us to host must be at a minimum highly available, and preferably ...
0
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1answer
150 views
Sharepoint 2010 Foundation Fault Tolerance
Assuming a completely reliable SQL Server infrastructure (i.e. SQL Server is not part of the question), what is the simplest and cheapest (i.e. minimum number of servers) method of making a ...
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1answer
155 views
How do IP addresses transfer when using VMware Fault Tolerance?
I've been doing some thinking about VMware Fault Tolerance and I have a question about the networking side of things. I'll state how I think it works, and you can tell me where i'm wrong.
Lets say we ...
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1answer
364 views
Using Openfiler inside a virtualmachine and VmWare Fault Tolerance
currently I have 2 servers with Fault Tolerance working with another server with openfiler as a iSCSI server (looks like without that Fault Tolerance does not work). I would like to remove that server ...
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3answers
2k views
Minimum number of disks to implement RAID6
RAID6 is intended to provide fault tolerance in the event 2 disks fail.
What is the minimum number of disks required to implement RAID6?
thanks
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2answers
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High availability for databases (DRBD + GFS)?
Does it work to have like an MySQL (or any other relational database) on the GFS (with DRBD) and have multiple nodes reading and writing to it? Is that the "best" way of providing a HA ...
