hi,

quoted

[root@gateway home]# lsof | grep md1
md1_raid1   461      root  cwd       DIR                9,0     4096          2 /
md1_raid1   461      root  rtd       DIR                9,0     4096          2 /
md1_raid1   461      root  txt   unknown                                        /proc/461/exe

PT> What is running as process ID 461?  That needs to be killed off, and any
PT> mount involving /dev/md1 stopped.
process ID 461 is [md_raid1] and can't be killed via kill or kill -9:
root       461  2.2  0.0      0     0 ?        S<   Jun14  61:09 [md1_raid1]

there is no "normal" mount on /dev/md1, maybe LVM has its fingers on
it although it should not?

[root@gateway ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/md0              7.8G  4.8G  2.7G  65% /
/dev/mapper/vg_gateway-lv_var
                       12G  1.1G   11G   9% /var
/dev/mapper/vg_gateway-lv_home
                       12G  4.1G  7.2G  37% /home
/dev/mapper/vg_gateway-lv_data
                       60G   42G   15G  74% /data
tmpfs                 989M     0  989M   0% /dev/shm
[root@gateway ~]# umount /dev/md1
umount: /dev/md1: not mounted

tnx & cu