"Known issues" documentation page is missing bits that are present in the FAQ page

[markus_albe]

The "Error 24" issue posted on https://www.percona.com/doc/percona-xtrabackup/2.3/faq.htm is not present https://www.percona.com/doc/percona-xtrabackup/2.3/known_issues.html which can easily lead to that known problem from being overseen.

To fix add the following to the known_issues page:

Backup fails with Error 24: ‘Too many open files’

This usually happens when database being backed up contains large amount of files and Percona XtraBackup can’t open all of them to create a successful backup. In order to avoid this error the operating system should be configured appropriately so that Percona XtraBackup can open all its files. On Linux, this can be done with the ulimit command for specific backup session or by editing the /etc/security/limits.conf to change it globally (NOTE: the maximum possible value that can be set up is 1048576 which is a hard-coded constant in the Linux kernel).

And possibly other entries from the FAQ, or at least a big link suggesting to further read the FAQ.

[Hrvoje Matijakovic (hrvojem)]

Fixed here: https://github.com/percona/percona-xtrabackup/pull/181

[Shahriyar Rzayev (rzayev-sehriyar)]

Percona now uses JIRA for bug reports so this bug report is migrated to: https://jira.percona.com/browse/PXB-749