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Jan
28
comment Scheduler spikes single core on SMP Ubuntu vm under ESXi
@ewwhite: sudo /sbin/dump -0uanj -f - / | ssh -c blowfish user@target.example.com dd of=/Path/to/backup/file
Jan
27
comment Hubs/switches taking out switches?
This is the case for turning on storm-control towards customers.
Jan
27
answered Cisco Switch went mad
Jan
14
comment Scheduler spikes single core on SMP Ubuntu vm under ESXi
Can't reboot the server, so changing the number of vCPU isn't really an option at the moment. The hardware has an Intel E5540 CPU and about 16 GB of RAM. And it is indeed just the dump command piped over SSH to move the data to a backup server. I run it in parallel for all partitions in the system.
Jan
14
comment Scheduler spikes single core on SMP Ubuntu vm under ESXi
4 core hardware, configured with 3 vCPU for this VM. It's an old configuration, I don't know the details of why it was setup like this.
Jan
14
asked Scheduler spikes single core on SMP Ubuntu vm under ESXi
Jan
1
awarded  Yearling
Dec
21
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Sep
20
awarded  Notable Question
Sep
5
comment Ubuntu server 12.04, apache2 - very slow response to first request
Post your answer here, so we can close the question with a good answer. ;)
Sep
5
comment Ubuntu server 12.04, apache2 - very slow response to first request
If it's still slow on HTTP you can ignore this. Then I would suggest looking at DNS as @GioMac suggested. I must have misunderstood your question.
Sep
4
comment CPU allocation for VMs on ESXi
Giving each server 4 vCPU should be fine in your scenario. You will get a large performance boost for the VMs and utilize your hardware more efficiently. But that is an oversubscription of the CPU, as you would have assigned 4*4 = 16 vCPU to 12 cores. Oversubscription means that you have assigned more resources to your virtual machines than is available on the physical hardware, and rely on the fact that all machines don't use the resources at the same time.
Sep
4
comment Ubuntu server 12.04, apache2 - very slow response to first request
My experience is that key exchange can take a very long time on servers where the CPU load is too high, as the key exchange is several orders of magnitude more expensive than serving a normal request.
Sep
4
comment Ubuntu server 12.04, apache2 - very slow response to first request
Would requests on HTTP still be fast if DNS is failing?
Sep
4
answered Ubuntu server 12.04, apache2 - very slow response to first request
Sep
4
comment CPU allocation for VMs on ESXi
@TheFiddlerWins: My experience with ESXi is that the scheduling has improved significantly and the overhead for configuring systems with multiple vCPU's has been reduced with each generation. While it was certainly true for some early versions of ESXi that you could back the system in a corner by running VM's with too many vCPU's I have not seen that behavior in years. Are you sure it is still possible to get things to go slower by adding vCPU's to a vm in scenarios without heavy vCPU over-subscription and load?
Sep
4
revised CPU allocation for VMs on ESXi
deleted 9 characters in body
Sep
4
answered CPU allocation for VMs on ESXi
Sep
4
comment Get domain names from IP addresses from access.log
Parsing Apache logs is a rather messy way to do this. Usually a solution such as Google Analytics will give you more reliable data.
Jul
10
awarded  Popular Question