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8 votes

Difference between hard drives

Yes, that is correct. There are multiple reasons for this: SAS drives are sold less, leading to scale effects. They are actually more reliable These 1.2 GB 2.5" are 10k RPM drives, so they are ...
Sven's user avatar
  • 99.6k
7 votes
Accepted

mkfs.ext4 error with option -O ^64bit

Just do not try to manually disable (^) the feature, then. You already are trying to create a volume exceeding what is possible without it. Adding ability for the file system to be larger than 16TiB (...
anx's user avatar
  • 9,821
7 votes
Accepted

Infrastructure - management - Is moving from custom code base in place to Ansible worth it?

Since your situation obviously isn't only about finding a good way forward from your current situation but also about politics in the workplace it doesn't look as though a purely technical argument ...
Mikael H's user avatar
  • 5,119
6 votes
Accepted

Redundant UPS with 2 power sources

You're looking for a power distribution unit (PDU) with an automatic transfer switch (ATS). The PDU can choose a power source from two (or more) sources to use -- in this case, it would use one with ...
lungj's user avatar
  • 296
5 votes

Azure ARM Templates for deleting the resources

Sort of. When you deploy an ARM template you can do it in two modes, Incremental or Complete. Incremental is the default and will add resources to a resource group and change the configuration on ...
Sam Cogan's user avatar
  • 38.9k
5 votes

Mirroring 2 Host with their own local storage

Look at StarWind VSAN 2-nodes hyperconverged solution on VMware here. It gives a possibility to mirror storage between the hosts and present it as HA datastore to the cluster. Virtual Machines can be ...
batistuta09's user avatar
  • 9,151
4 votes

Difference between hard drives

Creating IT infrastructure is a huge responsibility and their is ALOT to hardware purchases and investments. If you are not sure about what to get, get in touch with a trusted vendor that can help you ...
Cristian Matthias Ambæk's user avatar
4 votes
Accepted

How to use another IP-address for outgoing traffic?

Most networking related tools like ping will have an option to select the source IP they will use for outgoing connections, so for example with ping you can use ping -I IP-B. For all traffic to use ...
ZaphodB's user avatar
  • 663
4 votes
Accepted

How can I keep a third-party cloud provider accountable for guest VM performance?

It's perfectly possible; pretty much anything can be specified in a Service Level Agreement (SLA). Since your provider is a smaller one, I would say you have a somewhat better chance of getting this ...
MadHatter's user avatar
  • 80.8k
4 votes
Accepted

Load balancer or proxy to route traffic to different servers based on their URL

I guess you are referring to this shopify DNS setup. Point the A record to the Shopify IP address 23.227.38.65. Point the CNAME record with the name www to shops.myshopify.com root domain (@) Well ...
mattpr's user avatar
  • 716
3 votes
Accepted

What would be some Patterns and Anti-Patterns for deploying mirrored environments in AWS (or other cloud providers)

So a few general points to say on this quite complex topic - it depends a lot on what you are really trying to achieve. You have three options: Single VPC - single set of large subnets - in your ...
Alex Moore's user avatar
  • 1,754
3 votes

How do the TLD DNS servers handle so many zone file updates?

First, do you really think that there are more updates than let us say, credit card transactions per seconds in the world, managed finally by only 2 or 3 companies? Those work, so it is a solvable ...
Patrick Mevzek's user avatar
2 votes
Accepted

Can unjacketed cable handle gigabit speeds?

It's not possible to tell for certain from a picture. Obviously the best thing to do would be to get or borrow (since they're expensive) a tester and do some end-to-end testing to find out for ...
Ward - Trying Codidact's user avatar
2 votes

How to use terraform.io to change the image of a stateful server without downtime or data loss?

I think Terraform now has the features required here. The basic pattern is to define your data volumes separately and attach these to the instances, so that when the instance is destroyed and a new ...
joelittlejohn's user avatar
2 votes
Accepted

Openstack redundant architecture on three servers

You cannot deploy Control and Compute nodes in the same server for a production environment (only for PoC purposes, like devstack and packstack all-in-one solutions). Normally, you will have 3 ...
José Castillo Lema's user avatar
2 votes

Latency load balancing + failover solution

To update my answer - all of these are optional. Caching can be turned off to allow dynamic responses. and traffic can be served over HTTP only if desired. One solution that I certainly love is ...
Harry Traynor's user avatar
2 votes

How to let Ansible pick a datastore and ESX host in VMware?

I use raw module for some tasks on esx host that are not available via native Ansible modules. You can do raw: "df | grep datastore1 | awk '{print $4}'" to get free space, for example. Note, that ...
Konstantin Suvorov's user avatar
2 votes

Setup a private network between my 7 dedicated servers in different data centers?

Based on the the question criteria and comments, VPN is your best bet, though you will incur some overhead for the encryption. Personally I still recommend migrating to a dedicated host that offers a ...
Confusias's user avatar
  • 148
2 votes
Accepted

Maintenance of nginx server with zero downtime

One possibility is to install a second nginx server and set up keepalived on both of them. Each server has its own unique IP address. In addition, keepalived allows you do define a floating IP ...
Oliver's user avatar
  • 6,038
2 votes
Accepted

What are some behaviors/patterns that indicate that a host is degrading?

As far as I know most operating systems nowadays are actually quite good and stable but when you are regularly applying security updates and bug fixes you will need to reboot every once in while as ...
Bob's user avatar
  • 6,011
2 votes
Accepted

Architecting for microservices application

Ok, first up you've got a few different services doing the same thing there so you want to evaluate whether you need them all. Azure CDN and Front Door both offer the same local point of presence and ...
Sam Cogan's user avatar
  • 38.9k
2 votes

How to find out which version of OpenStack is running on a server?

Currently I don't know a better way than looking into the release notes and compare your versions with the ones listed in the details pages. For example, your version of python-openstackclient seems ...
eblock's user avatar
  • 477
2 votes
Accepted

What is the order in which apps respond when I visit DOMAIN:PORT on my VPS?

nginx (or Apache) tells the kernel that it is listening on a specific port by calling listen(2). The port number is configured with listen directive in the nginx config (Listen for Apache.). Only one ...
AlexD's user avatar
  • 10.4k
2 votes

PowerEdge FX2s ram types

Configs can be different, just make sure all the components (RAM, disks, and so on) are within the vendor blessed specs. Blade servers are like normal servers, just power, network, and sometimes ...
El Marinero 's user avatar
2 votes

Where is "edge compute" actually located?

This a response to help you refine question. First thing to understand is there is no actual techinical definition of "Cloud" or "Edge". These are just marketing terms that have ...
DogBoy37's user avatar
  • 121
1 vote

AWS Cloudformation Template error: every Ref object must have a single String value

In this case use the full form Fn::Ref: Targets: - Arn: Fn::Ref: !Sub 'SNSTopic${EmailCount}' # Note Fn::Ref instead of just Ref That should work.
MLu's user avatar
  • 25.5k
1 vote

What Can ELB Do That ALB Cannot?

ELB can pass through TCP protocol (non-HTTP/HTTPS) while ALB only works with HTTP/HTTPS. If you need raw TCP and not use ELB then there is NLB - Network Load Balancer. Other than that nah, there are ...
MLu's user avatar
  • 25.5k
1 vote

A good method of mapping our AWS server infrastructure

I haven't found a tool that does good, useful AWS diagrams automatically yet. I have a few tools I use if I want a list of resources: AWS Tag Editor : built into AWS, just provides a list that you ...
Tim's user avatar
  • 33k
1 vote

Is it possible to make website that is using the cloudflare dns proxy work during cloudflare outage?

How will this have better availability than a CDN with 150 points of presence globally? And whose solution requires they manage your DNS? Your business continuity plan could include alternate ...
John Mahowald's user avatar
1 vote

Multiple instances mysql on Centos 5.5

For mysql command line you need a my.cnf file in a location read by mysql --help (at the top it lists the config files read. You'll need a directive like: [client] socket = /tmp/mysql{version}....
danblack's user avatar
  • 1,279

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