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Having issues with oracle starting up in our cluster environment due to disks not lining up properly. For example, on the problematic host, I see the following.

[1:0:0:0]    cd/dvd  AMI      Virtual CDROM    1.00  /dev/sr0
[2:0:0:0]    disk    AMI      Virtual Floppy   1.00  /dev/sdc

My LUN from the SAN starts at /dev/sdd. On the server that works, I have the following:

[3:0:0:0]    disk    AMI      Virtual Floppy   1.00  /dev/sdt

So its LUN starts at /dev/sdc. How can I force the "Virtual Floppy" to give up /dev/sdc so my LUN can take it over?!

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What kind of virtual is this virtual floppy? – Shane Madden Dec 14 '11 at 0:08
beats the heck out of me. im thinking it has to do w/ the iLOM device. There isn't a floppy device on this server, just a DVD rom and 4 disks. – luckytaxi Dec 14 '11 at 0:11
Do you need the virtual floppy? You can always remove it if not required. – Chopper3 Dec 14 '11 at 0:11
Nope so how do i remove it. That would solve my issue. – luckytaxi Dec 14 '11 at 0:18
full specs of server first please – Chopper3 Dec 14 '11 at 0:33
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You can't, the SCSI Device block device presentation isn't deterministic and never will be.

You must derive a unique identifier for that device and then create a UDEV rule that will create a persistent symlink which will always point to your virtual floppy, no matter what the scan order is.

See http://reactivated.net/writing_udev_rules.html

Trivial Example: http://www.cyberciti.biz/tips/linux-assign-static-names-to-scsi-devices.html

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