[CentOS] orphan inodes deleted issue

Dear All,
My servers running on CentOS 5.5 x86_64 with kernel 2.6.18.194.17.4.el
gigabyte motherboard and 2 harddisks (seagate 500GB).
My CentOS box configured RAID 1, yesterday and today I had the same
problem on 2 servers with same configuration. See the following error
messages for details:

EXT3-fs: INFO: recovery required on readonly filesystem.
EXT3-fs: write access will be enabled during recovery.
kjournald starting.  Commit interval 5 seconds
EXT3-fs: md1: orphan cleanup on readonly fs
ext3_orphan_cleanup: deleting unreferenced inode 2010087
ext3_orphan_cleanup: deleting unreferenced inode 259361
ext3_orphan_cleanup: deleting unreferenced inode 972510
ext3_orphan_cleanup: deleting unreferenced inode 2009841
ext3_orphan_cleanup: deleting unreferenced inode 2010102
ext3_orphan_cleanup: deleting unreferenced inode 2010079
ext3_orphan_cleanup: deleting unreferenced inode 2010078
ext3_orphan_cleanup: deleting unreferenced inode 2009831
ext3_orphan_cleanup: deleting unreferenced inode 2010001
ext3_orphan_cleanup: deleting unreferenced inode 2009991
ext3_orphan_cleanup: deleting unreferenced inode 2009989
ext3_orphan_cleanup: deleting unreferenced inode 2009811
ext3_orphan_cleanup: deleting unreferenced inode 2009806
ext3_orphan_cleanup: deleting unreferenced inode 2009978
ext3_orphan_cleanup: deleting unreferenced inode 2009976
ext3_orphan_cleanup: deleting unreferenced inode 2009972
ext3_orphan_cleanup: deleting unreferenced inode 2009828
ext3_orphan_cleanup: deleting unreferenced inode 2009964
ext3_orphan_cleanup: deleting unreferenced inode 2009865
ext3_orphan_cleanup: deleting unreferenced inode 2009863
ext3_orphan_cleanup: deleting unreferenced inode 2009830
ext3_orphan_cleanup: deleting unreferenced inode 2009809
ext3_orphan_cleanup: deleting unreferenced inode 2009823
ext3_orphan_cleanup: deleting unreferenced inode 2009856
ext3_orphan_cleanup: deleting unreferenced inode 2009807
ext3_orphan_cleanup: deleting unreferenced inode 2009799
ext3_orphan_cleanup: deleting unreferenced inode 2009794
EXT3-fs: md1: 27 orphan inodes deleted
EXT3-fs: recovery complete.

It's my array:
$ df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/md1              9.5G  735M  8.3G   8% /
/dev/md7               38G  6.7G   30G  19% /var
/dev/md6               15G  4.5G  9.1G  33% /usr
/dev/md5              103G   45G   54G  46% /backup
/dev/md3              284G   42G  228G  16% /home
/dev/md2              2.0G  214M  1.7G  12% /tmp
/dev/md0              243M   24M  207M  11% /boot



I've been searching on google but I can't find the explanation for this
problem. It's a BUG? :D
Thank You very much :D

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Best regards,
David
http://blog.pnyet.web.id