kern/164252: Journal Overflow
grimeton at gmx.net
Tue Jan 17 18:20:08 UTC 2012
>Synopsis: Journal Overflow
>Arrival-Date: Tue Jan 17 18:20:07 UTC 2012
FreeBSD test 9.0-RELEASE FreeBSD 9.0-RELEASE #0: Tue Jan 3 07:46:30 UTC 2012 root at farrell.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC amd64
I'm running some performance tests with iozone to see which filesystem/volume manager/raid version/... fits my needs best.
After running the test on top of ZFS I destroyed the pool and created a freebsd-ufs partition on the "empty" drive. Here the output of "gpart show"
=> 34 976773101 ada0 GPT (465G)
34 976773101 1 freebsd-ufs (465G)
I then labeled the partition ada0p1 with gjournal and created a new UFS2 on top of ada0p1.journal with journaling enabled (-J).
Then the partiton was mounted and the iozone test was started inside. The command was "iozone -RA -g 16G". When starting to write 1GB of data in 64k chunks, the system crashed (check the - literally - screenshot attached).
The system wasn't even able to write more than 2GB of the 8GB memory back to disk before it completly froze.
I did the exact same test with this system and ZFS on the empty disk and everything worked as expected.
I wasn't able to attach the screenshot, so I uploaded it here: http://img515.imageshack.us/img515/9622/gjournal.jpg
If you have any questions just contact me.
- Setup 9.0-RELEASE on one harddrive
- Fetch ports, compile benchmarks/iozone
- create a GPT scheme on another, empty, disk
- setup a freebsd-ufs partition
- label the partition with gjournal
- create UFS2 on top of the journaled partiton with journaling enabled (-J)
- mount the new fs to /test
- cd to /test
- start iozone like "iozone -Ra -g 16G"
- wait and watch it crash
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