Greetings Mark, I have found two methods that work for resizing the btrfs
"/" filesystem.
The two methods are to update /etc/fstab or update the kernel and then
update grub2.
I have a couple of questions.
1 - When I extend a xfs filesystem I do not need to update the kernel
or /etc/fstab.
2 - When I update the kernel I had to specify both disks.
The IPL volume and the dasd the I use to extend the filesystem.
I thought it odd that I had to specify the IPL volume.
Is there a reason for this? The 3120 address is the IPL volume.
Note: this is probably true for updating /etc/fstab but I did not try this
variation.
Method 1: Update /etc/fstab
cio_ignore -r 0.0.0604
chccwdev -e 0.0.0604
lsdasd - check dasd location
dasdfmt -b 4096 -f /dev/dasdb -p -y
fdasd -sa /dev/dasdb
Yast - make device persistent
reboot
btrfs device add /dev/dasda1 /
btrfs filesystem resize max /
Update /etc/fstab
UUID=b273239f-1943-4607-ad44-2e007624ee1b / btrfs
device=/dev/dasda1,device=/dev/dasdb3 0 0
grub2-install
Method 2: Update the kernel.
cio_ignore -r 0.0.0604
chccwdev -e 0.0.0604
lsdasd - check dasd location
dasdfmt -b 4096 -f /dev/dasdb -p -y
fdasd -sa /dev/dasdb
Yast - make device persistent
reboot
btrfs device add /dev/dasda1 /
btrfs filesystem resize max /
Yast update kernel parameters - !0.0.0604,!0.0.3120 and dasd=0604,3120
grub2-install
From: Mark Post <mp...@suse.com>
To: LINUX-390@VM.MARIST.EDU
Date: 01/27/2017 06:28 PM
Subject: Re: Unable to IPL the system after resizing "/" btrfs
filesystem
Sent by: Linux on 390 Port <LINUX-390@VM.MARIST.EDU>
>>> On 1/27/2017 at 11:31 AM, Michael J Nash <miken...@us.ibm.com> wrote:
> cio_ignore -r 0.0.0604
If this is a z/VM environment and not an LPAR, I strongly recommend
completely disabling cio_ignore.
Mark Post
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