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Questions tagged [high-availability]

High availability is an architectural consideration often involving degrees of redundancy to insure availability in case of system or component failure.

High availability is an architectural consideration often involving degrees of redundancy to insure availability in case of system or component failure. Highly available systems are commonly implemented in situations where the risk outweighs the cost.

Best practices such as change control, standardized procedures, and monitoring can also enable high availability.

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How to: Hot Standby SQL Server in another datacenter?

For our SaaS app, I want to have a system in place for a datacenter wide failure. In the main datacentre, we have two servers set up with MSSQL Database Mirroring (synchronised). This provides us with a good enough high availability solution for…
Marcus
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DNS Round Robin: Multiple Nameservers VS Multiple A Records?

Note: This is a follow-up to my previous question regarding DNS Failover. The Goal: to make the client's web browser select the next available server if one is down instantly. I've read somewhere that multiple A records (while not the best solution)…
IMB
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Data loss due to MySQL DRBD Heartbeat failover script

Using DRBD version: 8.2.6 (api:88/proto:86-88) Here is the contents of /etc/ha.d/haresources db1 192.168.100.200/24/eth0 drbddisk::mysql Filesystem::/dev/drbd0::/drbd::ext3::defaults mysql and /etc/ha.d/ha.cf logfile …
Andy
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Is this a HPC or HA mySQL cluster?

Can someone tell me if this is a High Performance Compute or High Available mySQL cluster? There is a picture of the setup. This is part of the config.ini they talk about [ndbd default] NoOfReplicas=2 # Number of replicas Is it correct…
Louise Hoffman
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Exchange 2010 DAG Automatic Failover Testing/Issue. Not always automatically failing over to healthy DB copy depending on the way mounted server wrecks

Ok I've got 2 exchange 2010 servers that run client access/hub transport/mailbox roles and one exchange 2010 server running just client access/hub transport roles and acts as my bridgehead. The two mailbox servers are running one database setup in…
Richard
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High-availability system, how do I start?

I want to study about high-availability server, and then build a demo system (which contains HA web server - IIS, and a HA database - SQL Server ). I have some experiences about high-availability SQL-Server, but I don't know that at system level,…
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redundant openvpn configuration

I have two openbsd nat/firewall boxes with carp for failover / high availability purposes. What would be the best possible practice to ensure that OpenVPN, which I plan on running on these boxes, fails over gracefully as well?
imaginative
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2 Different Public Address for High Availability

this is my first time asking a question here, and I was wondering is it possible to have two different ISP public IPs connected to a single system for high availability? for example, if our ISP 1 became offline the 2nd ISP will be available, just…
Nät Castaritas
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Which VM Availability Zone is used on Azure if no availability option is selected?

I find the documentation on Azure Availability Zones a bit lacking on details about high availability, so I hope someone here knows these details about some undocumented behaviour. What happens when a Virtual Machine (or any other zonal resource,…
Aleksandar Stojadinovic
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Tasks Scheduler Windows High Availability

What is the best way to put in place «tasks scheduler» with high availability under Windows? Currently, the tasks are planned on a single server, which is a problem when the server reboot (for many reasons) Is there a Cluster system to resolve…
Julien MERICE
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Heartbeat vs UCarp

Can anyone explain what is the major difference between Heartbeat and UCarp for IP fail-over scenarios? They both seem to provide this functionality, perhaps UCarp simpler to set-up? Thanks.
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Creating a VSAN datastore

I am trying to set up my first HA cluster and I have some hard time digging into VSAN datastores. I have two ESXi hosts both with two 480 SSD hard drives in RAID 1 Can I add the existing hosts' disks to VSAN datastore? As far as I know, the ESXi…
d3m0n
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How to set up tcp check with keepalived?

Trying to set up HA bastion servers. Failover, load balancing is not needed. Two servers running debian. bastion01 and bastion02. 192.168.0.10 and 192.168.0.11. Floating IP is 192.168.0.12. I started out with these configs: bastion01: global_defs { …
cat pants
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Informix HDR failover doesn't work when primary DB server and Connection Manager/ICM are terminated simultaneously then ICM is brought back online

Automatic switchover is configured in a primary/secondary HDR server setup. The HDR cluster would be connected and replication is on. If the service is stopped gracefully on the primary server (NODE-A) or the VM is terminated, failover happens and…
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vSphere 6.5 HA agent cannot be correctly installed or configured

Last week we encounter the following issue : we had to shutdown our entire infrastructure due to UPS replacement. At the end of electrical operations we had restarted : network SANs vCenter ESXis (2 in cluster) After waiting for ESXi's startup, we…
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