On 01/02/2012 07:59 PM, Simo Sorce wrote: > On Mon, 2012-01-02 at 15:47 -0900, Erinn Looney-Triggs wrote: >> While digging through and trying to investigate a file system slowdown >> that may or may not be IPA related, I noticed an odd thing on my RHEL 5 >> and 6 based systems, the lastlog file was bloody huge: >> >> -rw-r--r-- 1 root root 469419202628 Jan 3 00:20 /var/log/lastlog >> >> Or for those of us who don't count that high . >> >> -rw-r--r-- 1 root root 438G Jan 3 00:20 /var/log/lastlog >> >> Now really it isn't that big: >> >> erinn@uat ~ $ du -sh /var/log/lastlog >> 64K /var/log/lastlog >> >> However, and I am no expert here, some backup programs will choke hard >> on this file, because it appears all that empty space will actually get >> nulled out, or at least this is happening to me with Bacula 5.0.2 on >> RHEL 5. More investigation into this part is necessary though... >> >> Now at a guess, this is probably related to this blog post: >> http://linuxshellaccount.blogspot.com/2007/11/trimming-space-in-var-problem-with.html >> >> That article was written for Solaris but it sure seems to be applicable >> to Linux as well. Though the multiples aren't the same. >> >> Frustratingly, this does not seem to be the case with all of my systems, >> only some of them. I have multiple RHEL 5 and 6 instances exhibiting >> this issue, and one RHEL 5 system that is not. >> >> This is probably a result of IPA choosing ludicrously high UIDs to avoid >> collisions (which is fine, no bashing here). >> >> Can anyone else confirm? Lend more insight? > > I can confirm. > apparently lastlog programmers decided that using sparse files to > implement a hash table where the key is the uid number was a good > idea ... > > Can you please file a bug against RHEL and CC me ? > > I am not sure what we do for RHEL5/RHEL6 as I don't know if the lastlof > file format changes is considered an aBI change but we can certainly > prevent this from happening in Fedora and RHEL7. > > I think, meanwhile you may want to exclude lastlog from backups or bzip2 > it before backing it up. > > Thanks for reporting this. > Simo. >
Done, thanks for confirming. https://bugzilla.redhat.com/show_bug.cgi?id=771286 -Erinn
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