Oh, yeah... It is there.
Doesn't seem to be a man page for it, but it does have internal help:
Usage: chccwdev [<options>] <devices>
<options>
-e|--online
Tries to set the given device online.
-f|--forceonline
Tries to force a device online if the device
driver supports this.
-d|--offline
Tries to set the given device offline.
<devices>
<bus ID>[-<busid>][,<busid>[-<busid>]] ...
The bus ID is the "0.0.0100" that I mentioned below. This does seem to be a
simpler solution.
> -----Original Message-----
> From: Linux on 390 Port [mailto:[EMAIL PROTECTED] Behalf Of
> Richard Hitt
> Sent: Thursday, May 11, 2006 3:13 PM
> To: [email protected]
> Subject: Re: [LINUX-390] Is it possible to move an LVM from guest to
> guest?
>
>
> It's chccwdev, not cchccwdev. Change CCW-based Device, named I guess
> along the model of other commands chmod, chroot, ....
>
> Richard Hitt [EMAIL PROTECTED]
>
> Hall, Ken (GTI) wrote:
>
> >Assuming cchccwdev is a program, Red Hat doesn't have it, so
> here's the "manual" procedure, which should work on any
> distro with a 2.6 kernel.
> >
> >If the device is 0100, for example, then you should have a directory:
> >
> >/sys/bus/ccw/devices/0.0.0100/
> >
> >that contains:
> >
> >availability cmb_enable detach_state discipline readonly
> >block cutype devtype online use_diag
> >
> >if you cat the file "online", and the device is actually
> online, it will return a "1".
> >
> >To put the device offline:
> >
> >echo 0 > online
> >
> >Then you can safely detach it via VM.
> >
> >On the target system, the subdirectory "0.0.0100" won't
> appear until you attach or link device 0100 via VM. Once
> that's done, you echo a "1" to the "online" file to bring it on.
> >
> >Note that this is INDEPENDENT of the device string you pass
> the module in modprobe.conf. Those are devices brought
> online AUTOMATICALLY. Using this manual method, you can
> bring ANY DASD device online that is linked or attached to
> the guest. We use this scheme to temporarily bring the CMS
> 191 disk online during boot to copy off configuration files.
> >
> >Piece of cake!
> >
> >
> >
> >>-----Original Message-----
> >>From: Linux on 390 Port [mailto:[EMAIL PROTECTED] Behalf Of
> >>Ranga Nathan
> >>Sent: Wednesday, May 10, 2006 4:58 PM
> >>To: [email protected]
> >>Subject: Re: [LINUX-390] Is it possible to move an LVM from guest to
> >>guest?
> >>
> >>
> >>
> >>
> >>Hall, Ken (GTI) wrote:
> >>
> >>
> >>>Unmount the filesystem, and run "vgexport" for the volume group.
> >>>
> >>>
> >>Great.
> >>
> >>
> >>>Then take the volume offline via sysfs
> >>>
> >>>
> >>You mean cchccwdev -d /dev/.... ?
> >>sysfs manpage refers to /proc/filesystems which lists used
> >>file systems.
> >>
> >>
> >>
> >>>, and detach it from the guest (This assumes you're on the
> >>>
> >>>
> >>2.6 kernel. With 2.4 it's a little more complicated).
> >>
> >>
> >>on 2.6. Good to go!
> >>
> >>
> >>>Repeat the process in reverse on the other system, doing a
> >>>
> >>>
> >>vgimport on the other side.
> >>Cool.
> >>
> >>
> >>> I'm reasonably sure I've done this successfully.
> >>>
> >>>It's much easier to set up an NFS share though, and leave
> >>>
> >>>
> >>the volume attached to one guest.
> >>
> >>
> >>Agreed, NFS would be helpful, but when you have to do repairs
> >>in single
> >>user mode, it is good to mount the LVM in the sick guest
> >>sometimes and
> >>do the repair, although most likely I will mount the sick
> volume on a
> >>good guest. You got me thinking.
> >>Thanks a bunch.
> >>
> >>
> >>>>-----Original Message-----
> >>>>From: Linux on 390 Port [mailto:[EMAIL PROTECTED]
> >>>>
> >>>>
> >>Behalf Of
> >>
> >>
> >>>>Ranga Nathan
> >>>>Sent: Wednesday, May 10, 2006 2:52 PM
> >>>>To: [email protected]
> >>>>Subject: [LINUX-390] Is it possible to move an LVM from guest
> >>>>to guest?
> >>>>
> >>>>
> >>>>I want to set up an LVM that I can move from guest to
> >>>>
> >>>>
> >>guest. I have a
> >>
> >>
> >>>>3390-09 volume that I want to use for this.
> >>>>Why? It makes it easy to re-do file systems, at least for now.
> >>>>I have LVM running on a couple of guests but I dont know if it is
> >>>>possible to move this 'utility' LVM from guest to guest
> >>>>easily *without*
> >>>>any outage to the guests.
> >>>>Thanks
> >>>>
> >>>>--
> >>>>__________________
> >>>>Ranga Nathan
> >>>>Work: 714-442-7591
> >>>>
> >>>>
> >>>>
> >--------------------------------------------------------
> >
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