Pasi Kärkkäinen wrote:
On Sun, Apr 15, 2007 at 05:36:40PM +0000, Finnur Örn Guðmundsson wrote:
Pasi Kärkkäinen wrote:
Hi list!
I have a server with dual port Qlogic iSCSI HBA. I set up the same LUN for
both ports, and boot the CentOS installer with "linux mpath".
Installer detects multipathing fine, and creates mpath0 device for root
disk.
Installation goes fine, and the system boots up and works fine after the
install from the multipath root device.
After install the setup is like this:
LUN 0 on port 1: /dev/sda
LUN 0 on port 2: /dev/sdb
and those form mpath0 device, which works OK.
But then comes the problem.. when I add another LUN for both ports, the
setup is like this:
LUN 0 on port 1: /dev/sda
LUN 1 in port 1: /dev/sdb
LUN 0 on port 2: /dev/sdc
LUN 1 on port 2: /dev/sdd
And now after rebooting the system, root device multipath (mpath0) doesn't
work anymore.. initrd seems to use/mount /dev/sda* partitions instead of
mpath0
device. In fact the whole mpath0 is not started up.
The weird thing is that the other LUN is now using multipathing instead..
using mpath1 device.
How can I fix that? I'd like to use multipathing for both LUNs, also for
root
device.
If I regenerate initrd with verbose flag, it just sets up the mpath1, not
mpath0. I guess that's because mpath0 is not running when regenerating
initrd.
I have edited /etc/multipath.conf and disabled the "blacklist" line, and
added multipath-entries for both LUNs. So those should be fine..
Any ideas?
Thanks!
There seems to be a bug in the upstream version with mpath & root
devices.....I asked RedHat support to help me with a similar problem but
go the answer that i should wait until update 1....the current
implementation of mpath for boot devices seems to handle adding
paths/devices somewhat weird if you add/remove paths....
Thanks for your reply!
Did they have any workarounds?
-- Pasi
Bgrds,
Finnur
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Not really :(......If you read the release notes for upstream there is a
clause that mentions problems with mpath:
Installing to dm-multipath Devices
Anaconda now has the capability to detect, create, and install to
/dm-multipath/ devices. To enable this feature, add the parameter
*mpath* to the kernel boot line.
Note that the parameter *mpath* may cause a boot failure if a
device's *major:minor* number changes. This issue will be addressed
in a future update of Red Hat Enterprise Linux 5.
Basicly....we need to wait until update 1 ;)....
Bgrds,
Finnur
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