Hi all. I have two hosts with drbd: kmod-drbd83-8.3.8-1.el5.centos drbd83-8.3.8-1.el5.centos and kernel (CentOS 5.7): 2.6.18-308.4.1.el5 After a recent upgrade of kernel I have had two sitiuations when my ext3 filesystem on /dev/drbd0 became read-only. I've checked disks with smartctl -t long, they are ok. There are no messages with disks problems in /var/log/messages | dmesg. I've made fsck tonight but 3 hours after it has finished the problem repeated once more (under heavy load). /var/log/messages: May 6 06:22:27 srv1a kernel: EXT3-fs error (device drbd0): htree_dirblock_to_tree: bad entry in directory #43024813: rec_len % 4 != 0 - offset=73728, inode=1701012818, rec_len=30313, name_len=101 May 6 06:22:27 srv1a kernel: Aborting journal on device drbd0. May 6 06:22:28 srv1a kernel: journal commit I/O error May 6 06:22:28 srv1a kernel: ext3_abort called. May 6 06:22:28 srv1a kernel: journal commit I/O error May 6 06:22:28 srv1a kernel: EXT3-fs error (device drbd0): ext3_journal_start_sb: Detected aborted journal May 6 06:22:28 srv1a kernel: ext3_abort called. May 6 06:22:28 srv1a kernel: EXT3-fs error (device drbd0): ext3_journal_start_sb: Detected aborted journal May 6 06:22:28 srv1a kernel: Remounting filesystem read-only May 6 06:22:28 srv1a kernel: __journal_remove_journal_head: freeing b_committed_data May 6 06:22:28 srv1a kernel: __journal_remove_journal_head: freeing b_committed_data May 6 06:22:28 srv1a kernel: __journal_remove_journal_head: freeing b_committed_data May 6 06:22:28 srv1a kernel: journal commit I/O error May 6 06:22:28 srv1a kernel: EXT3-fs error (device drbd0): htree_dirblock_to_tree: bad entry in directory #43024813: rec_len % 4 != 0 - offset=106496, inode=1701012818, rec_len=30313, name_len=101 May 6 06:22:28 srv1a kernel: EXT3-fs error (device drbd0): htree_dirblock_to_tree: bad entry in directory #43024813: rec_len % 4 != 0 - offset=204800, inode=1869116005, rec_len=29811, name_len=46 I've found: https://bugzilla.redhat.com/show_bug.cgi?id=494927 There are some clues that it may be a kernel problem so I went back to: 2.6.18-274.7.1.el5 At the moment the situation is ok but I've read that the problem happens in random circumstances. Any clues what to do? Best regards, Rafal.