# I have the following questions

**URL:** <https://forums.percona.com/t/i-have-the-following-questions/6998>\
**Category:** Percona XtraDB Cluster 5.x\
**Created:** [May 6, 2019, 10:27pm UTC](https://forums.percona.com/t/i-have-the-following-questions/6998 "2019-05-06T22:27:33Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![marknicolai192](https://avatars.discourse-cdn.com/v4/letter/m/ccd318/32.png) [@marknicolai192](https://forums.percona.com/u/marknicolai192)\
**Post date:** [May 6, 2019, 10:27pm UTC](https://forums.percona.com/t/i-have-the-following-questions/6998/1 "2019-05-06T22:27:33Z")

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Hi all,

This arises a lot of questions w.r.t high availability… I have the following questions in my mind:

1. When the 1st and 2nd nodes were down, why the surviving 3rd node could not serve reads and writes?
2. Even after making space on the 1st and 2nd nodes, when i tried to start mysql , why it couldn’t start? If bootstrap was the reason then why it didn’t automatically shift to surviving node?

I hope there might be a configuration issues which needs to be changed…

Any help here would be highly appreciated…

Thanks for help