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Bug #1086
closedrbd: iozone failure
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Description
I was able to reproduce Fyodor's problem on rbd (latest kernel) and ext2:
root@uml:~# mke2fs /dev/rbd0 mke2fs 1.41.12 (17-May-2010) Filesystem label= OS type: Linux Block size=4096 (log=2) Fragment size=4096 (log=2) Stride=0 blocks, Stripe width=0 blocks 6406144 inodes, 25600000 blocks 1280000 blocks (5.00%) reserved for the super user First data block=0 Maximum filesystem blocks=4294967296 782 block groups 32768 blocks per group, 32768 fragments per group 8192 inodes per group Superblock backups stored on blocks: 32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632, 2654208, 4096000, 7962624, 11239424, 20480000, 23887872 Writing inode tables: done Writing superblocks and filesystem accounting information: done This filesystem will be automatically checked every 39 mounts or 180 days, whichever comes first. Use tune2fs -c or -i to override. root@uml:~# mount /dev/rbd0 mnt cd mnt root@uml:~# cd mnt root@uml:~/mnt# iozone -a -n4g -g20g Iozone: Performance Test of File I/O Version $Revision: 3.308 $ Compiled for 64 bit mode. Build: linux Contributors:William Norcott, Don Capps, Isom Crawford, Kirby Collins Al Slater, Scott Rhine, Mike Wisner, Ken Goss Steve Landherr, Brad Smith, Mark Kelly, Dr. Alain CYR, Randy Dunlap, Mark Montague, Dan Million, Gavin Brebner, Jean-Marc Zucconi, Jeff Blomberg, Benny Halevy, Erik Habbinga, Kris Strecker, Walter Wong, Joshua Root. Run began: Thu May 12 16:20:59 2011 Auto Mode Using minimum file size of 4194304 kilobytes. Using maximum file size of 20971520 kilobytes. Command line used: iozone -a -n4g -g20g Output is in Kbytes/sec Time Resolution = 0.000001 seconds. Processor cache size set to 1024 Kbytes. Processor cache line size set to 32 bytes. File stride size set to 17 * record size. random random bkwd record stride KB reclen write rewrite read reread read write read rewrite read fwrite frewrite fread freread 4194304 64 3570 3040 12640 13725 Error in file: Found ?aaaaaaaaaaaaaaaa? Expecting ?3838383838383838? addr 40a00000 Error in file: Position 2813329408 Record # 42928 Record size 64 kb where 40a00000 loop 0
Not sure yet if this is an osd or rbd problem.
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