Hello and good day!

I have a CentOS 4.4 box with a PATA drive as the system drive. I also inserted a Belkin SATA controller (Sil 3112 chip) with a WD 400G drive to use as my archive. I am trying to mount it for NFS/SAMBA on the mount point /shared. Whether I use /mnt or /shared I get the following message:

"mount: /dev/sda1 already mounted or /mnt (/shared) busy".

I booted to a Gentoo livecd and it mounted just fine. I tried lsof and it shows nothing. I am really stumped as this never happened under SuSE, Gentoo, Debian. The file system is ext3 and I have tried every option with mount and even some of the suggestions on other similar posts.

Thank you for any feedback.
Dean.

By the way, lspci shows the device and the kernel module is loaded. Should I compile it into the kernel??

Show the exact command you used please. And the output from the command; fdisk -l (that is the letter 'L' and not the number one).

I used:

mount /dev/sda1 /mnt or /shared
mount -t ext3 /dev/sda1 /mnt or /shared
mount -t auto /dev/sda1 /mnt or /shared

And the fdisk:

Disk /dev/hda: 41.1 GB, 41174138880 bytes
255 heads, 63 sectors/track, 5005 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/hda1 * 1 2422 19454683+ 83 Linux
/dev/hda2 2423 2549 1020127+ 82 Linux swap

Disk /dev/sda: 400.0 GB, 400088457216 bytes
255 heads, 63 sectors/track, 48641 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

Device Boot Start End Blocks Id System
/dev/sda1 * 1 48640 390700768+ 83 Linux

This should be inmaterial as again it has worked under every other Linux that I have used with same commands. And fdisk -l is the same. So I assume it is related to Redhat/CentOS??

Covering some basics..........

Might it be already mounted in the /media directory??? or someplace else??? Does the hard drive have an entry in /etc/fstab??? Are you using maybe using LVM and the hard drive is already in use, a quick check of how much available space you have might be helpful; df -h

No, no, no, and NO! And df will not show a drive if it is not mounted. Remember my primary drive is hda so the sda1 is the only partition. This is a CentOS issue as I just installed RHEL AS 4.0 and WHOLA, it worked. Trust me I have checked all of the obvious things to no avail.

Device mapper was causing the issue so I disabled dm-mod/dm-mirror and it mounted upon reboot!

Damm......... I keep forgetting about device-mapper since it causes problems for me, I just turned it off also. Glad you figured it out and got it going.

Yeah I never gave it any thought because I have no lv's. But when I tried to mount it using the label it mentioned a duplicate name and show the /dev/mapper... notation.

Now I disabled it by commenting out the "md" and "dm-mod" lines in modules.dep. Is there a better way? I am studying for the RHCE so I need to learn this stuff. I noticed that you have a RHCE and I was wondering what book(s) you used if any.

Thank you Lenard.
Dean.

P.S. I noticed you are in Indiana. Where you born there? I was born in Lafayette and I live in Chicagoland now.

Just a lot of learning over the years in the school of hard knocks plus reading the manuals and at the time the latest edition of the Red Hat Linux Bible.

http://www.redhat.com/docs/manuals/enterprise/
http://www.amazon.com/Fedora-Red-Ent.../dp/0471754919

Nope, I currently live in Columbus but I was born in Cleveland Heights, Ohio and raised mostly in Wayne, Michigan.

So how do you turn off this device mapper? I am having the same problem.

Edit the following file:

/lib/modules/`uname -r`/modules.dep

And remove/comment(#) all lines with dm-mod/dm-mirror.

To totally get rid of it you can recompile the kernel and remove the entries, but then every time you update your system you have to remember to manually update the kernel or it gets replaced with another stock kernel. Another reason I REALLY enjoy Gentoo!!

Take care.

THANK YOU for this post... I suspect this may be the solution to a problem I am having. I'll give it a shot and reboot when my users go home for the day.

I have 3 PATA HDD's in my system- One 40 gb was a Redhat 8.0 install. I nuked and installed RHEL AS 4.0 on it, and left all the other HDD's alone. When I booted back up, all was good, except the most important HDD /dev/hdb1 (samba share) shows symptoms described here. Cannot be mounted- and there is no sign of it being in use- despite the error message I get. lsof, mount, the whole bunch of suggestions. But a reboot with a Knoppix 3.7 works just fine, and /dev/hdc1 was a blank HDD, so I copied over all the files from /dev/hdb1 to it so that my users aren't down come Monday (today). Smooth sailing with that.

I'm hoping this is the trick that will solve my problems tonight so I can rsync the changes from /dev/hdc1 to /dev/hdb1 and re-adjust the samba.conf paths and nobody'll know the difference. :-)

*crossing fingers*

Please let me know if that solves it.

In my case, removing the dm_mod from modules.dep did not work. After the reboot, still I was not able to mount my SATA drives.

I had two 120Gb SATA_NV drives and had 2 partitions each on them as /dev/sda[12], /dev/sdb[12]

I had to use dmsetup command to solve my problem. I had noticed that the mapper had created the following device map for my SATA devices.

I had to run the following commands to release my sata devices permanently out of device mapper.

After these commands, I am able to mount my sata devices without even rebooting the machine.

Hi, thanks a lot for this post, I had the problem mounting a second drive, I solved it modifying modules.dep file, BUT, if I modify the /etc/fstab file to mount the disk automaticaly at reboot time, modules.dep is overwritting and comments to lines with dm-mod disappear. Somebody has this error?

SUDARSUN, how did you noticed that the mapper had created the device map files?.

Thanks,
Katiusca