I was able to remove /dev/sdb and /dev/sdc. I even went so far as to
remove the mapping from the SAN, rebooted and only the native hd is
picked up at /dev/sda.
I re-mapped a 500GB parition to this particular host...there is only one
fibre-channel card plugged in, the second one isn't used yet. When I
rebooted/rescanned for drives, both /dev/sdb and /dev/sdc are picked up.
/dev/sdc is recognized as the 500GB parition, but linux can't read
/dev/sdb. What is this and where is it coming from? I'm not using
multipathing as far as I'm aware of.
oh the SAN is a Sun StorageTek 2540.
Ryan
Ray Van Dolson wrote:
On Fri, Apr 17, 2009 at 10:06:49AM -0700, Ryan Golhar wrote:
How do I determine the device mapping of a SCSI drive to the SCSI host,
bus, lun? And How to I remove the mapping to delete the SCSI drive?
I have a fibre-connected SAN. I've created a few drives on the SAN and
mapped it to my linux host. The linux host sees the drives just fine.
I remove the drives from linux, and left them as uninitialize disks.
Whenever I run "fdisk -l", I get output:
[root@cicweb1 tmp]# /sbin/fdisk -l
Disk /dev/sda: 440.0 GB, 440076861440 bytes
255 heads, 63 sectors/track, 53502 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 1 13 104391 83 Linux
/dev/sda2 14 53502 429650392+ 8e Linux LVM
This might help:
http://kbase.redhat.com/faq/docs/DOC-3942
I typically use /proc/scsi/scsi or lsscsi to list the devices and
figure out which ones I want to remove, then use the appropriate
command to remove the device.
I also get in /var/log/messages that drives that I since removed from
the SAN. How to I remove these (/dev/sdb and /dev/sdc) in linux?
<snip>
I wonder if you have multipathing set up? The failover path often will
show up as an invalid or unavailable drive.
This usually can be fixed by setting the correct multipath device
settings in your /etc/multipath.conf config file.
Ray
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