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I am working on a unix server and I guess during some time in past the file system had been full. However, I need some solid data to prove it. Will there be any OS logs or something of that sort to confirm my assumption?

It's an AIX system.

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Which flavour of UNIX? Depending on the flavour, you may or may not have some evidence of the issue in /var/log, /var/adm/, errpt, syslog, or some other locations. – EightBitTony Oct 19 '12 at 16:51
If the filesystem is where the logs are stored is full, where would it log the condition? – Zoredache Oct 19 '12 at 19:04
An easy way to test would be to create a VM with the minimum amount of space to install and just create a file via dd if=/dev/zero of=output.dat bs=1024 count=FILE_SIZE_IN_BYTES to fill up the rest of the space. – jmathew Oct 19 '12 at 19:12
up vote 2 down vote accepted

On AIX, you will get entries in the standard error log if a filesystem operation fails due to a filesystem being full. You can view that error log with the errpt command.

You will see something like this,

xxxxxxxx   xxxxxxxxx I O SYSJ2         UNABLE TO ALLOCATE SPACE IN FILE SYSTEM
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I suspect without proof that there is a log entry sent to the console when a disk-full condition occurs. If so, alog -o -t console should show it to you. It should be easy to experiment: fill up a disk (on a non-production system!) and see what appears in alog.

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I'll agree with EightBitTony with his answer. For a detailed description about which exact filesystem was full, you could go ahead with the following commands:

errpt | grep -i "unable to allocate to allocate space in filesystem"
errpt -aj identifier-code
df -gt mount-point

You could also pinpoint the exact date and time for it in the first command itself where you will know it from the timestamp given.

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