<p dir="ltr"></p>
<p dir="ltr">On Sep 28, 2016 6:14 AM, "Joseph Beard" <<a href="mailto:joseph@josephbeard.net">joseph@josephbeard.net</a>> wrote:<br>
><br>
> On Sep 25, 2016, at 9:54 PM, Brian <<a href="mailto:bnmille@gmail.com">bnmille@gmail.com</a>> wrote:<br>
><br>
> > XFS was specifically designed for large file systems. And the EXT file system is not known as a performance powerhouse. So I would convert those filesystems back to XFS. Then you would be able to see if that new controller is causing issues.<br>
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> I converted the `/mnt/backup` partition back to XFS. That alone has solved the two performance degradations I was experiencing! I would not have expected such a _large_ difference between those two. I’m not intimately familiar with how either of those filesystems are built, but I am very curious what makes this such a degenerate case for ext4. Does ext4 not deal well with large numbers of hard linked files?<br>
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> Now for the tricky part: converting the `/srv` partition back to XFS. I no longer have a spare drive large enough to hold its contents while I reformat the partition…<br>
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> Thanks for your help!<br>
><br>
><br>
> Joe<br>
><br>
><br>
> --<br>
> Joseph Beard<br>
> <a href="mailto:joseph@josephbeard.net">joseph@josephbeard.net</a><br>
><br>
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<p dir="ltr">From my reading, it has more to do with the way journaling is implemented on each filesystem. Although XFS gives better performance, I've seen posts where people complain about losing data in areas with poor power reliability. They claim they have no such issues with EXT. It also looks like the XFS developers are trying to fix that, but in a way that will not be backward compatible. You won't be able to upgrade an existing XFS filesystem to the new version.</p>
<p dir="ltr">There seems to be a movement to abandon EXT, also. Both Red Hat and SuSE now default to BTRFS for root filesystems (because of its inherent snapshot capability). And use XFS for everything else.<br>
</p>