Hi,
We are experiencing allot of filesystem issues, for example:
 kernel: EXT3-fs error (device drbd0): ext3_free_blocks_sb: bit already cleared 
for block 5776787
These occur randomly after several consequative failovers between the cluster 
nodes.
We are using drbd with ext3 filesystem with a write-through controller.
Are there any preferences what elevator we should use?
According to http://www.drbd.org/users-guide/s-latency-tuning.html 
 both cfq/deadline are fine with preference to deadline.
But both re-order writes, right? possibly breaking file system/journal on 
standby.
 
Please advise,
 
Setup
 drbd with ext3 filesystem 
 write-through controller
 Two nodes cluster
 Physical Appliances
 CentOS 6.2 with 2.6.32-220
 kmod-drbd83-8.3.12-1.el6.i686
 
Thanks,
Oren
                                          
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