March 2021 - Dev - lists.ceph.io

03/04/2021 perf meeting is on!

by Mark Nelson

Hi Folks, The performance meeting will be starting in roughly 20 minutes! Today Gabi would like to give an update on his bluestore allocation optimization work (25%+ random write performance increase!) and Adam and I will give an update on the investigation into the bluefs_buffered_io=disabled performance investigation (hint, it looks a lot like range scan iteration is not effectively coming from block cache in some cases). Hope to see you there! Etherpad: https://pad.ceph.com/p/performance_weekly Bluejeans: https://bluejeans.com/908675367 Mark

3 years, 1 month

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Requesting for permission ceph-ci

by seong yeop jeong

I want to get permission ceph-ci for push.

3 years, 1 month

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Can I file a claim with a Cash app refund?

by xiangfu461＠gmail.com

Yeah, sure, you can claim with a Cash app refund by following the below steps. Actually, for it, you are asked to click on the Activity tab from the top of the Cash app screen. Next, you have to click on the transaction tab from the question, and next click on the … from the top right of the screen. Next, you have to click on the Need Help & Cash App support tab. Next, you have to click on the Dispute this transaction tab.https://www.experts-support.com/blog/cash-app-refund

3 years, 1 month

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Can I file a claim with a Cash app refund?

by xiangfu461＠gmail.com

Yeah, sure, you can claim with a Cash app refund by following the below steps. Actually, for it, you are asked to click on the Activity tab from the top of the Cash app screen. Next, you have to click on the transaction tab from the question, and next click on the … from the top right of the screen. Next, you have to click on the Need Help & Cash App support tab. Next, you have to click on the Dispute this transaction tab.https://www.experts-support.com/blog/cash-app-refund

3 years, 1 month

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Do you want a refund for scammed? Use Cash app customer service?

by xiangfu461＠gmail.com

If you are pondering to get a refund for scammed, then you must contact Cash app customer service immediately. Actually, there is a fraudulent department, where you can claim for a scammed account. And, if any amount debited from your account, then the support team help you to get your money back. But, make sure you never pay to anyone by wire payment, because you can’t claim for it.https://www.experts-support.com/cash-app-customer-service/

3 years, 1 month

1
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Do you want a refund for scammed? Use Cash app customer service?

by xiangfu461＠gmail.com

If you are pondering to get a refund for scammed, then you must contact Cash app customer service immediately. Actually, there is a fraudulent department, where you can claim for a scammed account. And, if any amount debited from your account, then the support team help you to get your money back. But, make sure you never pay to anyone by wire payment, because you can’t claim for it.https://www.experts-support.com/cash-app-customer-service/

3 years, 1 month

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Spoil in web coming driving you to consider how to delete Cash App account? Call client care association for help.

by xiangfu461＠gmail.com

There can be times when there is a glitch in the web openness that can make you think how to delete Cash App account?To kill this glitch, you can change to a more grounded affiliation or you can change to better wifi association. In spite of this you can call the client care sponsorship and address the rep to discard the glitches.https://www.experts-support.com/blog/cash-app-delete-account

3 years, 1 month

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Spoil in web coming driving you to consider how to delete Cash App account? Call client care association for help.

by xiangfu461＠gmail.com

There can be times when there is a glitch in the web openness that can make you think how to delete Cash App account?To kill this glitch, you can change to a more grounded affiliation or you can change to better wifi association. In spite of this you can call the client care sponsorship and address the rep to discard the glitches.https://www.experts-support.com/blog/cash-app-delete-account

3 years, 1 month

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Re: Octopus build available in download.ceph.com

by Dimitri Savineau

Hi Victoria, The commits from the PR you mentioned are present in the 15.2.9 Octopus tag/release so you should have the changes when using [1] which is a symlink to [2] Regards, Dimitri [1] https://download.ceph.com/debian-octopus/ [2] https://download.ceph.com/debian-15.2.9/

3 years, 1 month

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TLA+ formal specification of Ceph consensus algorithm

by Afonso Fernandes

Hello, My name is Afonso Fernandes, and I am a student at the University of Porto. I am writing a formal specification in TLA+ of the paxos consensus algorithm implemented in Ceph as part of my master thesis. The specification is in the following repo, along with instructions to run, some description and current results of the model. https://github.com/afonsonf/ceph-consensus-spec I decided to write the specification to better understand the consensus algorithm used in Ceph. Although it is based on paxos, which has detailed formal proofs, the implemented version makes some deviations from the "original" one, making it, in my opinion, somewhat difficult to make a parallel between the two. Therefore, I think a formal specification can be helpful in further development of Ceph. Some of the useful things that can be done with this model are: * Prove safety and liveness properties of the implemented algorithm. Test new versions of the algorithm to see if the properties still hold. * Visualization of the algorithm. Possibility of creating traces of segments of the algorithm and see how the variables change (example: https://github.com/afonsonf/ceph-consensus-spec/tree/main/trace-example). * Make interactive visualizations of the algorithm (such as this one: https://github.com/will62794/tlaplus_animation/blob/master/examples/Elevato…). * Analyse statistics of the state machine generated from the algorithm. * Debug the algorithm. Search behaviours that lead to certain configurations and study what can happen from there. In conclusion, I would like to ask the opinion and, if possible, some criticism or suggestions about the specification (the specification probably has errors because I may have misinterpreted some parts of the code). The main topics that I think I may have got wrong are summarized in the section "Deviations and abstractions from the original source" in the description file: https://github.com/afonsonf/ceph-consensus-spec/blob/main/description.md. Thank you for reading and all the help is welcomed! Best Regards, Afonso Fernandes

3 years, 1 month

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Dev March 2021