I removed the multipath, rebooted, made successful tests the HBA and NIC, reinstalled multipath, rebooted and this time the I/O works fine! After my initial multipath install, I partitioned, formated and mounted the LUNs to verify they were working. I think that must've caused some kind of corruption that would not allow them to work with my Oracle installation until they were reset fresh. Interesting. What a fun process that was to go through. For the Oracle 10g record, I used the /dev/dm-* devices instead of the mapper devices. Permissions were able to be set and there's no problem accessing the devices. Thanks, Scott On Wed, Mar 12, 2008 at 8:46 PM, Scott Moseman <scmoseman@xxxxxxxxx> wrote: > > Actually I need to take that back now. The direct i/o support works > fine on local disks and even my iSCSI SAN connections direct through > an HBA or NIC. But it's when I try to access them via multipath > devices they fail and have the i/o errors. I updated my ticket with > Red Hat, but so far they're not coming back with anything at all. > > Thanks, > Scott > > > On Tue, Mar 11, 2008 at 3:14 PM, Scott Moseman <scmoseman@xxxxxxxxx> wrote: > > > > Thanks for the info. Our problem has been isolated as lack of direct > > i/o support on our Red Hat box. The problem does not appear to be > > MPIO related, at least not from what Oracle support is telling me. So > > now I'm off to deal with Red Hat support to see how they counter. > > > > Thanks, > > Scott > > > > > > On Wed, Feb 27, 2008 at 1:17 PM, Dharmesh Kamdar <kamdard71@xxxxxxxxx> wrote: > > > > > > Hi Scott, > > > > > > This weblink may help --> > > > http://www.ardentperf.com/2008/02/13/oracle-clusterware-on-rhel5oel5-with-udev-and-multipath/ > > > I've not tried this, but the author of the article > > > claims that it works.. > > > > > > We are also facing similar issue(s) with Oracle and > > > RHEL 5.1 using UDEV/Device-mapper..I've also posted a > > > query on the same > > > (https://www.redhat.com/archives/dm-devel/2008-February/msg00201.html) > > > ...But it just discusses the changing of permissions, > > > however creation of raw devices using UDEV is not > > > specified, hence we are still looking for that answer. > > > > > > Hope it helps somewhat. > > > > > > Let us know. > > > > > > Regards, > > > Dharmesh. > > > > > > > > > --- Scott Moseman <scmoseman@xxxxxxxxx> wrote: > > > > > > > How can I get the mapper device permissions set on > > > > reboot? > > > > > > > > When I attempted to try this... > > > > > > > > # cat /etc/udev/permissions.d/50-udev.permissions | > > > > grep mapper > > > > mapper/mpath*:oracle:dba:0660 > > > > > > > > But it did not seem to work... > > > > > > > > # ls -l /dev/mapper/mpath* > > > > brw-rw---- 1 root disk 253, 2 Feb 26 20:56 > > > > /dev/mapper/mpath0 > > > > brw-rw---- 1 root disk 253, 5 Feb 26 20:56 > > > > /dev/mapper/mpath0p1 > > > > brw-rw---- 1 root disk 253, 3 Feb 26 20:56 > > > > /dev/mapper/mpath1 > > > > brw-rw---- 1 root disk 253, 4 Feb 26 20:56 > > > > /dev/mapper/mpath1p1 > > > > > > > > Am I doing something wrong? Is there another way to > > > > do this? > > > > > > > > Thanks, > > > > Scott > > > > -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
