Mount "already mounted or /mnt busy" problems with dmraid, Promise FastTrak, 2.6.12
 

This is a Debian system with a Promise MBFastTrak133 Lite software RAID controller. The root filesystem, /boot, and the other parts of the core live on a separate drive, so I'm not booting off any of the software RAID drives. I recently upgraded from a 2.4.22 kernel to a 2.6.12 kernel, and I've been using dmraid to try to get the controller working. However, though dmraid appears to activate the drives correctly, I can't mount them.

The disks on the ataraid are set up as two indepedent disks and one mirrorer disk (two physical disks). Using dmraid -ay pdc to activate the disks creates several entries in /dev/mapper that look like this:

pdc_djcfggbe pdc_djcfggbe1 pdc_edbiihhe pdc_edbiihhe1

However, when I try to mount them, I get errors like this:

# mount -t ext3 -v -o ro /dev/mapper/pdc_djcfggbe /mnt/temp

mount: /dev/mapper/pdc_djcfggbe already mounted or /mnt/temp busy

Since /dev/mapper/pdc_djcfggbe isn't anywhere in /etc/fstab or /etc/mtab, and I know /mnt/temp isn't busy, I don't understand why I'm getting this error, and mount doesn't provide any more error messages. There's nothing in the kernel log or syslog associated with trying to mount the filesystems on these drives.

The output of dmraid -ay -vv pdc looks like this:

# dmraid -ay -vv pdc
NOTICE: skipping removable device /dev/hdd
NOTICE: skipping removable device /dev/hdc
NOTICE: skipping removable device /dev/hda
NOTICE: /dev/hdb: hpt37x discovering
NOTICE: /dev/hdb: hpt45x discovering
NOTICE: /dev/hdb: isw discovering
NOTICE: /dev/hdb: lsi discovering
NOTICE: /dev/hdb: nvidia discovering
NOTICE: /dev/hdb: pdc discovering
NOTICE: /dev/hdb: sil discovering
NOTICE: /dev/hdb: via discovering
NOTICE: /dev/hde: hpt37x discovering
NOTICE: /dev/hde: hpt45x discovering
NOTICE: /dev/hde: isw discovering
NOTICE: /dev/hde: lsi discovering
NOTICE: /dev/hde: nvidia discovering
NOTICE: /dev/hde: pdc discovering
NOTICE: /dev/hde: pdc metadata discovered
NOTICE: /dev/hde: sil discovering
NOTICE: /dev/hde: via discovering
NOTICE: /dev/hdf: hpt37x discovering
NOTICE: /dev/hdf: hpt45x discovering
NOTICE: /dev/hdf: isw discovering
NOTICE: /dev/hdf: lsi discovering
NOTICE: /dev/hdf: nvidia discovering
NOTICE: /dev/hdf: pdc discovering
NOTICE: /dev/hdf: sil discovering
NOTICE: /dev/hdf: via discovering
NOTICE: /dev/hdg: hpt37x discovering
NOTICE: /dev/hdg: hpt45x discovering
NOTICE: /dev/hdg: isw discovering
NOTICE: /dev/hdg: lsi discovering
NOTICE: /dev/hdg: nvidia discovering
NOTICE: /dev/hdg: pdc discovering
NOTICE: /dev/hdg: pdc metadata discovered
NOTICE: /dev/hdg: sil discovering
NOTICE: /dev/hdg: via discovering
NOTICE: /dev/hdh: hpt37x discovering
NOTICE: /dev/hdh: hpt45x discovering
NOTICE: /dev/hdh: isw discovering
NOTICE: /dev/hdh: lsi discovering
NOTICE: /dev/hdh: nvidia discovering
NOTICE: /dev/hdh: pdc discovering
NOTICE: /dev/hdh: pdc metadata discovered
NOTICE: /dev/hdh: sil discovering
NOTICE: sil: areas 1,2,3,4[4] are valid
NOTICE: /dev/hdh: sil metadata discovered
/dev/hdh: "sil" and "pdc" formats discovered (using pdc)!
NOTICE: /dev/hdh: via discovering
NOTICE: added /dev/hde to RAID set "pdc_edbiihhe"
NOTICE: added /dev/hdg to RAID set "pdc_edbiihhe"
NOTICE: added /dev/hdh to RAID set "pdc_djcfggbe"
INFO: Activating mirror RAID set "pdc_edbiihhe"
INFO: Activating stripe RAID set "pdc_djcfggbe"
NOTICE: discovering partitions on "pdc_edbiihhe"
NOTICE: /dev/mapper/pdc_edbiihhe: dos discovering
NOTICE: /dev/mapper/pdc_edbiihhe: dos metadata discovered
NOTICE: created partitioned RAID set(s) for /dev/mapper/pdc_edbiihhe
NOTICE: discovering partitions on "pdc_djcfggbe"
NOTICE: /dev/mapper/pdc_djcfggbe: dos discovering
NOTICE: /dev/mapper/pdc_djcfggbe: dos metadata discovered
NOTICE: created partitioned RAID set(s) for /dev/mapper/pdc_djcfggbe
INFO: Activating partition RAID set "pdc_edbiihhe1"
INFO: Activating partition RAID set "pdc_djcfggbe1"

(There are two stripe drives; I don't know why it isn't discovering anything on /dev/hdf. I'm praying that it didn't get corrupted somehow.)

After activating the raid drives, doing

# dmraid -s -s pdc_djcfggbe

yields this:

/dev/hdh: "sil" and "pdc" formats discovered (using pdc)!
*** Active Set
name : pdc_djcfggbe
size : 78165297
stride : 0
type : stripe
status : ok
subsets: 0
devs : 1
spares : 0

and

# dmraid -s -s pdc_edbiihhe
/dev/hdh: "sil" and "pdc" formats discovered (using pdc)!
*** Active Set
name : pdc_edbiihhe
size : 78125000
stride : 128
type : mirror
status : ok
subsets: 0
devs : 2
spares : 0

I admit that I'm at sea here: I'm not getting any errors I can work with, and what I've done seems to have worked for other people with similar hardware/software set-ups. Does anyone have any idea where I should look next?

I had a similar problem in Fedora Core 6 with an nvidia dmraid and I got it to mount by mounting /dev/mapper/devicename1.