On Jan 31, 2008 5:02 PM, Sharpe, Sam J <[EMAIL PROTECTED]> wrote: > > On 31 Jan 2008, at 21:43, dbcooper wrote: > > > Domenico, (and everyone else thanks) > > > > Thank you for your input. This seems to be a deeper rabbit hole than > > I expected. > > > > I tried (echo "1" > /sys/bus/scsi/drivers/sd/<SCSI-ID>/delete) and > > sure enough it cleanly wiped out the /dev/sdc and the /sys/block/ > > device etc. Upon reboot, it was back and had the same old Buffer I/ > > O errors and block errors on reboot and recreated the same /dev/sdc > > etc. > > > > So I started digging through the udev / udevinfo commands and > > comparing with lspci to find that yes the ghost /dev/sdc was hanging > > (supposedly) off my Qlogic Fiber Card, I then launched my Navisphere > > to make sure it only had one LUN being handed out (and it is). So I > > got even more confused. I've not got much SAN experince and I was > > handed this with my servers. I then took a look at the SANSurfer Cli > > tool (sfcli), I was able to see that the HBA does see (looks like > > it) 2 LUNS of exaclty the same size (I.E. it's really just the one I > > guess). > > A barrage of questions: > > Whose QLogic drivers are you using? Do you have multiple Fibre cards > in the system? Is your QLogic card dual-port? Do you have multiple SAN > switches? > > This sounds to me very like our systems would look when we have two > SAN paths to the same LUN (i.e. redundant fibre cards and a redundant > fabric). Unless you are using QLogic drivers that natively understand > Multipathing (it's an option - Red Hat's ship without as the preferred > method is dm-multipath - HPs (just as an example) ship with it turned > on so you don't need dm-multipath.) > > -- > Sam > > > > The LUN that is being presented to the machine is being mounted as > > sdd. (the offender I'm hunting down is sdc). > > Do you think it's possible that when I delete the sdc with the above > > "echo 1" you suggested and reboot, that the kernel is trying to > > assign the presented LUN as the next device in line sdc? (since sda, > > sdb and sdd are taken). > > > > I don't know anything about the persistent binding (yet) but I'll be > > going through all the docs from the Qlogic and EMC products tomorrow > > (now that I know what to start looking at). > > > > Thanks for any other advice (if you can suggest any). > > > > _______________________________________________ > rhelv5-list mailing list > [email protected] > https://www.redhat.com/mailman/listinfo/rhelv5-list >
Thank you, I'll get back to this tomorrow.
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