multipath fails on secondary path.

Versions and configs:
ii  multipath-tools                            0.4.8-14+lenny2          maintain multipath block device access
ii  multipath-tools-boot                       0.4.8-14+lenny2          Support booting from multipath devices
ii  multipath-tools-initramfs                  1.0.1+nmu1               Transitional package

Configs:
/etc/multipath.conf
##
## This is a template multipath-tools configuration file
## Uncomment the lines relevent to your environment
##
defaults {
        udev_dir                /dev
        polling_interval        2
        default_getuid_callout  "/lib/udev/scsi_id --whitelisted --replace-whitespace --device=/dev/%n"
        user_friendly_names     yes
}

devnode_blacklist {
        devnode "^(ram|raw|loop|fd|md|dm-|sr|scd|st)[0-9]*"
        devnode "^hd[a-z][[0-9]*]"
        devnode "^cciss!c[0-9]d[0-9]*[p[0-9]*]"
}


devices {
        device
        {
                vendor                  "IBM.*"
                product                 "1722-600"
                path_grouping_policy    group_by_serial
                path_checker            rdac
                path_selector           "round-robin 0"
               prio_callout            "/sbin/mpath_prio_rdac /dev/%n"
                failback                immediate
                features                "1 queue_if_no_path"
                no_path_retry           300
        }
}

multipaths {
        multipath {
                wwid               3600a0b800017d0110000070c4bfe44d9
                alias                   vz
        }
}

Logged errors when primary connection is removed:
est: I/O error, dev sda, sector 0
May 28 13:49:55 elkabong kernel: [ 2412.807159]  [<ffffffff802a1077>] do_sync_read+0xc9/0x10c
May 28 13:49:55 elkabong kernel: [ 2412.807191]  [<ffffffff8028698e>] handle_mm_fault+0x421/0x9c5
May 28 13:49:55 elkabong kernel: [ 2412.807240]  [<ffffffff80247c4d>] autoremove_wake_function+0x0/0x2e
May 28 13:49:55 elkabong kernel: [ 2412.807300]  [<ffffffff80221f52>] do_page_fault+0x5c9/0x9ab
May 28 13:49:55 elkabong kernel: [ 2412.807341]  [<ffffffff802a1847>] vfs_read+0xaa/0x152
May 28 13:49:55 elkabong kernel: [ 2412.807379]  [<ffffffff802a1c7d>] sys_read+0x49/0xc2
May 28 13:49:55 elkabong kernel: [ 2412.807420]  [<ffffffff8020c00a>] system_call_after_swapgs+0x8a/0x8f
May 28 13:49:55 elkabong kernel: [ 2413.615779] device-mapper: multipath: Failing path 8:0.
May 28 13:49:57 elkabong kernel: [ 2415.772007] end_request: I/O error, dev sda, sector 0
May 28 13:49:57 elkabong kernel: [ 2415.772007] device-mapper: multipath: Failing path 8:0.

# with active path unplugged
elkabong:/etc# multipath -ll
vz (3600a0b800017d0110000070c4bfe44d9) dm-0 IBM     ,1722-600
[size=100G][features=1 queue_if_no_path][hwhandler=0]
\_ round-robin 0 [prio=0][enabled]
 \_ 0:0:0:0 sda 8:0   [failed][ghost]

# with active path plugged in:
vz (3600a0b800017d0110000070c4bfe44d9) dm-0 IBM     ,1722-600
[size=100G][features=1 queue_if_no_path][hwhandler=0]
\_ round-robin 0 [prio=0][enabled]
 \_ 0:0:0:0 sda 8:0   [active][ghost]
\_ round-robin 0 [prio=3][active]
 \_ 1:0:0:0 sdb 8:16  [active][ready]


I have updated the commands in the config per what I have found about difference in etch and lenny. I have also tried changing the path checker from tur to rdac. Rdac is the one listed above.

Thanks.