How good is failover of the iSCSI target on a two-node linux san?

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http://serverfault.com – I'm evaluating the possibility to use two off the shelf servers to build a cheap iSCSI redundant SAN. The idea is to run linux, pacemaker, and an iSCSI target - something like the SAN Active-Passive on linux-ha-examples. The same page scares me a little when I read: During the switchover of the iscsi-target one can detect a gap in the protocol of write-test.log. In our setup we observed a delay of 30s. There are problems reported in connection of ext3 and an iscsi failover This configuration has been tested with ext2 and ext3 and worked with both filesystems. Has anyone put in p (HowTos)