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So, after a reboot the system was in perfect order. I ran memtest86+, badblocks and cpuburn. No errors were found anywhere and the smart self asesment was clean. Verifying the integrity of the (bulk of the) filesystem contents from the most recent backup yielded nothing, but that certainly isn't exhaustive obviously. Honestly I have no idea what happened, so ...


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From man e2fsck: -D Optimize directories in filesystem. This option causes e2fsck to try to optimize all directories, either by reindexing them if the filesystem supports directory indexing, or by sorting and com‐ pressing directories for smaller directories, or for filesystems using traditional linear directo‐ ries. Even without the -D option, ...


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I have found the solution: I figured out, that the specific User on the LVMs logical volume had reached its Quota limit. This was the root cause of all these problems... All FSCHKs were not successfull or only for some hours, cause the quota has filled up again... It looks like that reaching the quota can break the EXT4 structure.... Good to know for future ...


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Possible you have multiple independent problems at once, compromise of your applications, or failing storage, or something else. Carefully read How do I deal with a compromised server? Hope is not a plan. In general, the only way to be sure malware is gone is to completely delete the system, and reinstall the OS and applications from known good copies. For ...


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