OCFS2: Unappreciated Linux File System

Re:OCFS2: Unappreciated Linux File System by zapman449 on Wednesday June 30, 2010 @11:52AM (#1475232)

OCFS2, in the v1.4 branch has some extreme fragmentation problems. It seems to be just fine if you're dealing with large files, or lots of small files that don't change frequently. However, if you've got lots of turnover of lots of small files, you're going to get bitten.

If that describes you, you need to be willing to track the latest kernel releases, and able to rebuild your FS semi-frequently.

(I'm being bitten by this right now, and I need to rebuild the FS... not something I'm happy about.)

[ Parent | on HN ]

Re:OCFS2: Unappreciated Linux File System by illumin8 on Wednesday June 30, 2010 @12:15PM (#1475305)

We ran into this as well. The main problem is that when you get fragmented too badly you run into space allocation issues where you have tons of free space, but the kernel returns an "out of disk space" error because it couldn't allocate new blocks.

The only solution is to rebuild the filesystem and restore from tape. I suppose Oracle doesn't really have any motivation to fix this because most of their customers are using it for large database files rather than small files.

[ Parent | on HN ]

Re:OCFS2: Unappreciated Linux File System by zapman449 on Wednesday June 30, 2010 @05:26PM (#1476307)

It's also annoying to have open bugs that can't get any traction... I'm more than willing to do almost any test (short of destroying my data) to help them along, because an easy way to get multiple boxes with block access to a volume is pretty awesome...

[ Parent | on HN ]