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The cluster spec(http://redis.io/topics/cluster-spec) does not give a reason for this requirement. I guess it is because both the failure detection and the failover process require the majority of master nodes to reach an agreement. If we have only 2 masters and one failed, the other master node cannot make up the decision according to the protocol. Is this correct?
I think what you have pointed out is right.
It is suggested to have three master node and one slave to each of them.
http://redis.io/topics/cluster-tutorial:
Note that the minimal cluster that works as expected requires to contain at least three master nodes. For your first tests it is strongly suggested to start a six nodes cluster with three masters and three slaves.
Still you might be able to create cluster with less than three master node but that will affect the failover process you already pointed.
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Closed 4 years ago.
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How to check number of shards there in Redis?
I have searched net and redis documentation there isn't simple way to get current shards count in my redis cluster.
Redis uses the term SLOT instead of SHARDS. The slot number is fixed, and there are 16384 slots.
Also you can use CLUSTER SLOTS command to get the slot-node mapping, i.e. which node serves a given slot or slot range.
The cluster_size and cluster_known_nodes fields within the output of the cluster info (https://redis.io/commands/cluster-info) command should give you what you are looking for.
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Closed 2 years ago.
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Short question and hopefully a positive answer:
Is it possible to create a virtual CPU that consists from multible real cores?
So lets say you have a 4x3.5 GHz CPU, can you create a vCPU that is 1x14GHz ?
Why do it?
If there is a software which is heavily CPU using, but can just use one thread, it would boost up the program.
I am not very advanced with hardware tech, but I guess there is no way to do that.
Thanks.
So lets say you have a 4x3.5 GHz CPU, can you create a vCPU that is 1x14GHz ?
No. As the expression goes -- nine women cannot make a baby in one month.
Each instruction executed by a virtual CPU can potentially be dependent on anything that previously happened on that CPU. There's no way to run an instruction (or a group of instructions) before all of the previous instructions have been completed. That leaves no room for another physical CPU to speed things up.
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Closed 8 years ago.
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I have a project and I need to make a building plan with server room etc, so I need to know where to place my router and what do I need to put in my server room besides My servers.
In the image below i placed my Router in my server room but I don't know if that's right
If your system is a wired system then the position of the router is not really important.
But if it is a wireless, the problem become very very very complicated. I have witness the failure of my university trying to solve your problem (i am a victim). If you want to cover your place with WiFi signal then position of WiFi router must be calculated carefully with the involving of physics otherwise you may encounter issues like signal interference, lag, lost signals and so on.
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Closed 4 years ago.
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Overall, I need to be able to run backup jobs which are already in place, but are failing whenever run, see my last thread: http://www.reddit.com/r/techsupport/comments/1edqsx/ive_been_asked_to_backup_windows_servers_using/[1]
Today, I've been trying to clean the tape drive using a cleaning cartridge which we bought. I inserted the tape, imported it, and marked it as the cleaning slot within backup exec.
Now, however, I'm running into new problems I haven't encountered. First of all, when I try to perform a clean job within Backup Exec, the job starts and makes it to 17%, at which point it returns to 10 percent . It just does this cycle over and over again, never getting above 17%.
Next, I tried inventorying the tape library. I run the job and it begins, but always freezes indefinitely at 30%.
Does anybody have an idea what might be happening, and what I might do to get it working properly?
Verify that the firmware on the hardware is up to date. Also be sure that you are using Symantec drivers on the tape drives. You can do this by running the Tapeinst.exe command.
Edit... Also posted on your Redit thread
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Does anyone know where I could find a list of safe-for-work (i.e. no porn, piracy sites, etc) domain names that I can use to stress test software that performs asynchronous DNS lookups without raising questions if my network admin happens to be watching?
At least several thousand would be ideal. Most lists I've found have not been filtered at all. So far, using "raw" lists for DNS queries have not raised any questions, but my next step is to create TCP connections.
EDIT: I've cleared everything with local network admin people, however, this would still be nice to have for future developers on the project.
I think you probably worry too much. Having said that how about doing a google search for 'interesting facts about butterflies', parsing all the resulting domains and using those?
Your network admin will probably be more concerned with the fact that you're stress testing a network service on his network on the order of thousands of domains. If you have any kind of decent corporate firewall it's inspecting DNS queries and could choke on a high rate of queries. If your requirement is a legitimate business requirement the best option is to have your boss talk to the head of the network department to CYA.