Uhm... Martin I would strongly warn you from setting a dasd that is part
of a
mirroring md device online on a different system.
- In case the original system is active at that time you will run into
consistency trouble
because of multiple mounts without using a shared filesystem
- even when the original system is down, Zipl will create files on your
dasd (bootmap
for example), and they are _not_ the same as on the mirror copy. Your
mirror consistency
is broken when you do this.
I do strongly recommend using seperate dasd on /boot, no md device there!
with kind regards
Carsten Otte
--
I saw screens of green, red messages too, then came blue, shubidu
And i think to myself, what a wonderful world
Lufthansa Systems Infratec ZLINUX SYSPROG <[EMAIL PROTECTED]>
Sent by: Linux on 390 Port <[EMAIL PROTECTED]>
13/08/2004 12:22 PM
Please respond to Linux on 390 Port
To: [EMAIL PROTECTED]
cc:
Subject: Re: raid1
Hi Carsten,
Hm, but it works perfect - without having a /boot on a plain dasd or
scsi-disk.
We boot from /dev/md0. ok, you can not make a "zipl" on a /dev/md0. but
that's not necessary. Just mount the dasd on a second linux and then use
zipl to write the boot-data.
I only created a special initrd. Made a "mkraid" with a new dasd and copy
a linux-installation on it. If you add a mirror to the system, you have to
remember that there is no boot-information on it. Ergo - before you able
to boot from an new mirror-device mount the dasd on a second system and do
a "zipl". Sad, that zipl is not able to see the ucb/dasd behind a
md-device to write the boot-record.
Lufthansa Systems Infratec GmbH
Martin Lonkwitz Lufthansa Systems GmbH
UNIX Systems Engineer FRA AR/ISS
Systemplanung,-betrieb Am Weiher 24
und Entwicklung D-65451 Kelsterbach
Telefon:(069) 696-72456
Externer Servicepartner der Firma
networker, projektberatung GmbH
Am Kaltenborn 1
61462 K�nigstein
-----Original Message-----
From: Linux on 390 Port [mailto:[EMAIL PROTECTED] On Behalf Of
Carsten Otte
Sent: Freitag, 13. August 2004 10:21
To: [EMAIL PROTECTED]
Subject: Re: raid1
Hi Martin,
you cannot use a raid1 device for boot itself. The zipl bootloader
requires either a scsi disk or a dasd. With SLES this means, that you need
to have a plain dasd mounted on /boot in order to ipl.
For the root filesystem you can in fact use raid1 via the md driver or via
the logical volume manager. In case you are looking for full redundancy of
storage devices, it seems wise to create a second copy of the /boot
filesystem, and run zipl on the second ipl device as well. You will then
be able to boot from either disk, but you need to remember to re-do the
procedure whenever you update your system kernel.
with kind regards
Carsten Otte
--
I saw screens of green, red messages too, then came blue, shubidu And i
think to myself, what a wonderful world
Lufthansa Systems Infratec ZLINUX SYSPROG <[EMAIL PROTECTED]> Sent
by: Linux on 390 Port <[EMAIL PROTECTED]>
13/08/2004 08:01 AM
Please respond to Linux on 390 Port
To: [EMAIL PROTECTED]
cc:
Subject: raid1
Hi list !
Is anyone using raid1 as a boot-device under Suse SLES 8 or 9 ? if so,
what's your experience ?
cu
martin
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