general:
########
RHEL5.9 with all Updates
2.6.18-348.1.1.el5 (latest rhel kernel)
kmod-drbd83-8.3.12-1.el5.elrepo
drbd83-utils-8.3.12-1.el5.elrepo

/prod/drbd:
###########
# cat /proc/drbd
version: 8.3.12 (api:88/proto:86-96)
GIT-hash: e2a8ef4656be026bbae540305fcb998a5991090f build by dag@Build64R5, 2011-11-20 10:53:25
 0: cs:Connected ro:Primary/Secondary ds:UpToDate/UpToDate B r-----
    ns:59067952 nr:0 dw:43368780 dr:158048833 al:38098 bm:3387 lo:1 pe:0 ua:0 ap:1 ep:1 wo:d oos:0

drbd-config:
############
global {
	usage-count no;
}

common {
	protocol B;

	handlers {
		local-io-error "/usr/lib/drbd/notify-io-error.sh; /usr/lib/drbd/notify-emergency-shutdown.sh; echo o > /proc/sysrq-trigger ; halt -f";
	}

	startup {
	}

	disk {
                no-disk-barrier;
                no-disk-flushes;
	}

	net {
                max-buffers 8000;
                max-epoch-size 8000;
                unplug-watermark 1024;
                sndbuf-size 512k;
	}

	syncer {
                rate 25M;
                al-extents 3833;
                cpu-mask ff;
	}
}
resource eshop
{
  device    /dev/drbd0;
  disk      /dev/epages/data;
  meta-disk internal;

  on nfs01.eshop.hosteurope.de
  {
    address   10.110.127.129:7789;
  }

  on fallback.eshop.hosteurope.de
  {
    address   10.110.127.130:7789;
  }
}


dumpe2fs:
#########
# dumpe2fs /dev/mapper/epages-data
dumpe2fs 1.39 (29-May-2006)
Filesystem volume name:   <none>
Last mounted on:          <not available>
Filesystem UUID:          43f49808-cde0-4e28-8cea-3f79b4a7f095
Filesystem magic number:  0xEF53
Filesystem revision #:    1 (dynamic)
Filesystem features:      has_journal resize_inode dir_index filetype needs_recovery sparse_super large_file
Default mount options:    (none)
Filesystem state:         clean
Errors behavior:          Continue
Filesystem OS type:       Linux
Inode count:              52428800
Block count:              104857600
Reserved block count:     5242880
Free blocks:              39699591
Free inodes:              44193131
First block:              0
Block size:               4096
Fragment size:            4096
Reserved GDT blocks:      999
Blocks per group:         32768
Fragments per group:      32768
Inodes per group:         16384
Inode blocks per group:   512
Filesystem created:       Thu May 19 14:39:44 2011
Last mount time:          Wed Feb 20 14:39:47 2013
Last write time:          Wed Feb 20 14:39:47 2013
Mount count:              27
Maximum mount count:      32
Last checked:             Thu May 19 14:39:44 2011
Check interval:           15552000 (6 months)
Next check after:         Tue Nov 15 13:39:44 2011
Reserved blocks uid:      0 (user root)
Reserved blocks gid:      0 (group root)
First inode:              11
Inode size:		  128
Journal inode:            8
First orphan inode:       33579892
Default directory hash:   tea
Directory Hash Seed:      e84813f3-a414-479e-b69d-b0dc1d4cce53
Journal backup:           inode blocks
Journal size:             128M