Bauer, Bobby (NIH/CIT) [E] wrote:
How do I use by-device-address? Don't find it on the Redhat site nor did Google
tell me much. Fstab is built from the input of Anaconda when I build the server
isn't it?
The /dev/disk/ directory contains links with other ways to access the
DASD. For example, on my system:
# ls -ld /dev/disk/*
drwxr-xr-x 2 root root 480 Jul 15 19:22 /dev/disk/by-id
drwxr-xr-x 2 root root 60 Jun 25 15:13 /dev/disk/by-label
drwxr-xr-x 2 root root 380 Jul 15 19:22 /dev/disk/by-path
drwxr-xr-x 2 root root 60 Jul 15 17:12 /dev/disk/by-uuid
# ls /dev/disk/by-id/ccw-0X3D2C* -l
lrwxrwxrwx 1 root root 11 Jun 25 15:13 /dev/disk/by-id/ccw-0X3D2C ->
../../dasda
lrwxrwxrwx 1 root root 12 Jun 25 15:13 /dev/disk/by-id/ccw-0X3D2C-part1
-> ../../dasda1
lrwxrwxrwx 1 root root 12 Jun 25 15:13 /dev/disk/by-id/ccw-0X3D2C-part2
-> ../../dasda2
You can use these in /etc/fstab, but in your case with LVM, I don't
think it will help, since LVM entries in fstab are of the form
/dev/{volume_group_name}/{logical_volume_name}.
Going back to the original issue, the reason the new disk came up as
dasdg is because you're calling chccwdev/mkswap in /etc/rc.local. As
Adam, Pat, and Mike pointed out, you should use modprobe.conf for all
disks. Either:
options dasd_mod dasd=200-205,700-701
in which case any DASD you add after 701 will be dasdh. Or you could do
something like:
options dasd_mod dasd=200-20f,700-701
The latter is a preallocation of device nodes. You can add any DASD up
to 70f without needing to remake the initrd or rerun zipl.
-Brad
Bobby Bauer
Center for Information Technology
National Institutes of Health
Bethesda, MD 20892-5628
301-594-7474
-----Original Message-----
From: Linux on 390 Port [mailto:linux-...@vm.marist.edu] On Behalf Of Adam
Thornton
Sent: Tuesday, July 28, 2009 10:29 AM
To: LINUX-390@VM.MARIST.EDU
Subject: Re: Adding dasd technique
On Jul 28, 2009, at 9:18 AM, Bauer, Bobby (NIH/CIT) [E] wrote:
We are running Redhat V5 with z/VM V5.4 with all 3390 dasd. I need
to add another volume to one of my servers. I also have 2 swap disk
defined using Sine Nomine's swapgen macro in the profile exec for
the server and the mkswap and swapon commands in rc.local:
If you're running swapgen then you don't need to mkswap or swapon.
You should probably put dasd=200-205,700-701.
But you should also use the by-device-address form of talking about
your dasd (rather than dasda, dasdb, and so on) in /etc/fstab
precisely so you don't have to care as you add and subtract devices,
as long as they stay at the same virtual addresses.
Also don't forget to rebuild your initrd after every time you change
dasd configuration.
Adam
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--
Brad Hinson <bhin...@redhat.com>
Sr. Support Engineer Lead, System z
Red Hat, Inc.
(919) 754-4198
www.redhat.com/z
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