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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