 | | | md multipathing failover | md multipathing failover 2005-04-22 - By Gunther Schlegel
Back
Hi,
I am becoming a little desperate with my SAN (EMC Clariion, Qlogic HBAs)
connections.
With RHEL3 I just use the internal failover of the Qlogic driver. This
works fine.
However, the Qlogic-modules in FC2, FC3 and RHEL4 lack this feature. I
therefore rebuild the kernel with the Qlogic-driver on some FC2/3 hosts
to have the same functionality as in RHEL3.
These FC2/3 hosts should be upgraded to RHEL4 quite soon. As the
failover is
missing I tried to convert the SAN-attached filesystems to md
multipathing.
In general it works fine, but I tested the failover on a FC2 host
(latest errata kernel). The result is that the md0_multipath thread
takes up all the CPU ressources but does not actually switch to the
alternate path.
Besides, the multipath device is not assembled in a correct way during
bootup on FC2 as it uses raidtools instead of mdadm, but I corrected
this at runtime, so this cannot be the reason.
Question: - Does multipathing actually work with RHEL4? Did anyone pull
the plug to test it? Does it work on RHEL3? Does it even work on FC2 and
I am just missing something?
Sorry for crossposting and referring to Fedora Core, but I hope some
RHEL admins also run Fedora. The guys on the Fedora lists do not seem to
deal with stuff like SANs.
regards, Gunther
--
Gunther Schlegel Riege Software International GmbH
Manager IT Infrastructure Mollsfeld 10
40670 Meerbusch, Germany
Email: schlegel@(protected) Phone: +49-2159-9148-0
Fax: +49-2159-9148-11
-- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ------
Disclaimer:
You may grab my GPG key from http://www.keyserver.net .
A nonproportional font is recommended for reading.
--
Taroon-list mailing list
Taroon-list@(protected)
http://www.redhat.com/mailman/listinfo/taroon-list
Earn $52 per hosting referral at Lunarpages.
|
|
|