deactivate dm disks?

deactivate dm disks?

[Wakko Warner]

I was playing with evms (2.2 kernel 2.6.3 vanilla) and some reason, it
grabbed my usb disk (sde) and won't let go of it.  Is there any way I can
make it let go of the disk?  It grabbed sde1 and sde2 of the disk.

I tried the deactivate which just gave me an invalid argument. I really do
not wish to reboot this machine just to remove the usb disk.

I also noticed it wanted to grab my partitions on sda which were already
mounted and couldn't grab them.

-- 
 Lab tests show that use of micro$oft causes cancer in lab animals

Re: deactivate dm disks?

[Kevin Corry]

Hi Wakko,

On Monday 15 March 2004 7:56 pm, Wakko Warner wrote:
> I was playing with evms (2.2 kernel 2.6.3 vanilla) and some reason, it
> grabbed my usb disk (sde) and won't let go of it.  Is there any way I can
> make it let go of the disk?  It grabbed sde1 and sde2 of the disk.

You can put entries in your /etc/evms.conf file to tell EVMS to ignore certain 
disks (e.g. if you don't want it to examine sde). See the "legacy_devices" 
section (for 2.4 kernels) and/or the "sysfs_devices" section (for 2.6 
kernels).

> I tried the deactivate which just gave me an invalid argument. I really do
> not wish to reboot this machine just to remove the usb disk.

If you have the "dmsetup" tool, you can issue a "dmsetup remove_all" command 
to deactivate all the DM devices. Just make sure all the DM devices are 
unmounted, or it won't actually release the underlying disks. Dmsetup is part 
of the device-mapper package, available at ftp://sources.redhat.com/pub/dm/.

> I also noticed it wanted to grab my partitions on sda which were already
> mounted and couldn't grab them.

Again, you can add an "exclude" entry in your /etc/evms.conf if you want EVMS 
to ignore sda. Otherwise, have a look at
http://evms.sf.net/install/kernel.html#bdclaim

-- 
Kevin Corry
kevcorry@us.ibm.com
http://evms.sourceforge.net/

Re: deactivate dm disks?

[Wakko Warner]

> > I was playing with evms (2.2 kernel 2.6.3 vanilla) and some reason, it
> > grabbed my usb disk (sde) and won't let go of it.  Is there any way I can
> > make it let go of the disk?  It grabbed sde1 and sde2 of the disk.
> 
> You can put entries in your /etc/evms.conf file to tell EVMS to ignore certain 
> disks (e.g. if you don't want it to examine sde). See the "legacy_devices" 
> section (for 2.4 kernels) and/or the "sysfs_devices" section (for 2.6 
> kernels).

Ok, great, that works.

> > I tried the deactivate which just gave me an invalid argument. I really do
> > not wish to reboot this machine just to remove the usb disk.
> 
> If you have the "dmsetup" tool, you can issue a "dmsetup remove_all" command 
> to deactivate all the DM devices. Just make sure all the DM devices are 
> unmounted, or it won't actually release the underlying disks. Dmsetup is part 
> of the device-mapper package, available at ftp://sources.redhat.com/pub/dm/.

Ahh, thanks.  That did the trick.

> > I also noticed it wanted to grab my partitions on sda which were already
> > mounted and couldn't grab them.
> 
> Again, you can add an "exclude" entry in your /etc/evms.conf if you want EVMS 
> to ignore sda. Otherwise, have a look at
> http://evms.sf.net/install/kernel.html#bdclaim

I think I'll only give it disks that I want in evms.  The "sde" is a USB
disk that I move around alot.

If you're not the right person to ask, please direct me to someone else.
I was going to do a raid5 across a few disks (this is in the future not
now).  Is there any way to add disks to that raid5 using evms?

-- 
 Lab tests show that use of micro$oft causes cancer in lab animals

Re: [Evms-devel] Re: deactivate dm disks?

[Kevin Corry]

On Tuesday 16 March 2004 1:22 pm, Wakko Warner wrote:
> > > I also noticed it wanted to grab my partitions on sda which were
> > > already mounted and couldn't grab them.
> >
> > Again, you can add an "exclude" entry in your /etc/evms.conf if you want
> > EVMS to ignore sda. Otherwise, have a look at
> > http://evms.sf.net/install/kernel.html#bdclaim
>
> I think I'll only give it disks that I want in evms.  The "sde" is a USB
> disk that I move around alot.
>
> If you're not the right person to ask, please direct me to someone else.
> I was going to do a raid5 across a few disks (this is in the future not
> now).  Is there any way to add disks to that raid5 using evms?

I'm one of the right people to ask about EVMS. Please send questions to 
evms-devel@lists.sf.net and the whole group will be able to provide 
assistance.

EVMS will recognize and manage software raid devices, but currently doesn't 
support expanding raid-5 devices. It's on our list for later this year. I 
believe there's a stand-alone tool available that will let you do this 
(google for raidreconf).

-- 
Kevin Corry
kevcorry@us.ibm.com
http://evms.sourceforge.net/