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Questions tagged [availability]

36 questions
104
votes
14 answers

Is Ping a reliable way to check if a server is available?

In my application I am pinging a server and waiting for a response. I am using this to determine whether the server is available and responsive or not. Is this a reliable way of determining availability? I assume a firewall could be filtering icmp…
Peter Kelly
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8
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3 answers

How to manage communication during application downtime?

I've had a lot of experiences lately with application downtime, from both vendors and my own applications. This has got me thinking and as best I can google there isn't really a good or standard way of managing customer communication during downtime…
Brandon
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5
votes
1 answer

Determine availability zone of AWS IP address

I'm currently using Heroku (which uses AWS) and my program needs to communicate with my own EC2 instance. I've made my EC2 instance in the same Region as Herokus', however, in order to reduce costs further I want to be able to community via the…
Hengjie
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4
votes
2 answers

What availability is needed for an E-Mail server to not lose messages?

Setting up an E-Mail server, I wonder, what if it goes down. Do I need a redundant setup in order to not lose incoming mails? Or would it suffice to make sure it doesn't go offline for longer than, say, a day?
Philip
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4
votes
3 answers

Availability at risk due to one offline Domain Name Server?

A domain can have plenty of name servers registered at there domain registrar. The name servers are picked randomly and not like expected primary first, secondary second and so on. Knowing that, does this mean that when one name server is down,…
Bob Ortiz
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4
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4 answers

System Monitoring Redundancy

I consult in a small business environment where I have two HyperV hosts (with <10 VMs) + a couple other servers. I recently had an issue where one of the HyperV hosts had a CPU issue and it came down, bringing most of my non-critical VMs with it,…
Josh Brower
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3
votes
1 answer

EC2 Bandwidth between two instance in same availability zone

I'm using an Apache proxy on one server in front of tomcat on a different server. What is the the bandwidth between the two EC2 instances if they are in the same availability zone? Does this have anything to do with the network performance of the…
DD.
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3
votes
6 answers

uptime.exe crashing on Windows Server 2008

Can anyone get uptime.exe to run either the /s or /p:n switches on a Windows Server 2008 box without crashing? I realise it's a NT tool and no longer supported, but it worked fine on 2003. I've heard there's a version included in Server core, so I…
fenster
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2
votes
1 answer

Why may AWS t3.micro in Singapore respond slower than t2.nano in N. Virginia from Bangladesh?

I have a t2.nano instance running in North-Virginia availability zone (us-east-1) for almost 1 year. In hope of reducing latency, I just have deployed the created AMI of that instance to a t3.micro instance in Singapore (ap-southeast-1) zone. There…
Touhid
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2
votes
2 answers

Lifetime of IIS worker process or AppDomain

I have an ASP.NET app hosted in IIS, and I have automatic worker process recycling/shutdown disabled. I'd like to have a rough idea of how long the app has been running continuously without being re-loaded. My thinking is that one source from which…
G-Wiz
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2
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1 answer

When an ISP is DDoSed, will its NOC have Internet access?

When an ISP is hit by a huge DDoS attack and its data plane is severely congested, will its Network Operations Center (NOC) have alternative Internet access? I'm curious what would be the industry practice for the backup, alternative Internet…
min
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2
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1 answer

Website not available everywhere

Today I noticed my website http://mint-nachhilfe.ch/ was down, but other people (located in different networks) said it looks up from there. When I came home, I double-checked, and I can really reach it from here. Also, this website considers it…
Cedric Reichenbach
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2
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1 answer

How to check if redis master is OK?

On the documentation, they advice the monitor command. But it has a 50% performance penalty for the whole system, and how should I do that ? Whatching the ouput using SSH until I don't see anything ? Let's say I have 3 servers: 1 with a redis…
e-satis
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2
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0 answers

Exchange 2003 to 2010 migration: Can I remove free/busy public folder once all users are moved?

Now that all my mailboxes are on the 2010 server, can I remove the schedule+free/busy public folder? I am having scheduling synchronization issues, and I believe it may be at fault. All clients are using Outlook 2010 or 2007. Can I just get rid of…
Nick
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2
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5 answers

Check availability of my websites

How can I check the availability of websites from hosted by company? Ping the server and checking if the services for IIS or Apache/Tomcat is not enough. I want to see if the sites are responsive, if I can login. My idea is to build a script using…
DeChinees
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