From: speakmaj@mskcc.org
Date: Mon Feb 24 2003 - 15:10:47 EST
Hi all
Big dumb realization I just made (with a nudge from Pat): a LUN of N
doesn't mean the disk has to be dskN (can see the mapping in 'hwmgr
-show scsi'). Furthermore when presenting to the second host I can hit
"Advanced Options" and make it the same LUN.
But (a) when creating the disk, does it first asks me for an "OS Unit
ID" and then for a "LUN"? I thought they were the same? Or is "OS Unit
ID" the "dskN"?
And (b) if I want to go back and renumber the LUNs of existing disks,
e.g. the clusetr root, etc., to make them consistent (just to be tidy),
will I break something?
Thanks
John
-----Original Message-----
From: Speakman, John
Sent: Monday, February 24, 2003 2:18 PM
To: tru64
Cc: Speakman, John
Subject: EVA volumes have different LUNs on different hosts?
Hi all
We have two new GS80s running TruCluster 5.1A attached to an EVA.
Disclosure: I am used to HSZs and DU 4.0 and rz... devices so I may be
missing something obvious. But I have spent quite a while reading the
docs!
When I make a virtual disk on an EVA, I can assign it a LUN to the host
(I think I'm assigning a LUN - the EVA's HSV Element Manager software
calls it an "OS Unit ID"). I can also present it (i.e., make it
visible) to a host (just one at create time). When I do, the end result
is that it's presented to that host at that LUN. Very good.
However as soon as the volume is created I want to present it to the
second host. I can do this but don't seem to have an option to specify
the LUN again, which is okay but it seems to assign it a random LUN to
the other host and not use the LUN number I specified for the first
host. You can see this in the "Hosts/LUNs/State" window of the "Virtual
Disk Active Properties" page - for instance, if at create time I specify
volume "somevolumename" with an OS Unit ID of 2 and that it should be
presented to host "host1", then after creation I present it to host
"host2", I can look at the "Hosts/LUNs/State" and see it as
"host1/Active@2" but "host2/Active@5". Where did the 5 come from? To
my mind this is horrible - won't my host 1 see it as "dsk2" but host 2
see it as "dsk5"? This is the way the engineer set it up so I am loath
to tinker but what I would really like is that they appear to each host
with the same LUN. Is there something about TruCluster 5.X that means I
can't do this and makes the way the engineer did it okay?
Thanks
John
John Speakman - Manager, Clinical Research Systems
Division of Biostatistics, Memorial Sloan-Kettering Cancer Center, 307
East 63rd Street, New York, NY 10021, USA
Phone: 646 735 8187 / Fax: 646 735 0013 / E-mail:
speakman@biost.mskcc.org
This archive was generated by hypermail 2.1.7 : Sat Apr 12 2008 - 10:49:08 EDT