HI,
what those guides don't tell you is what you need to do to your XP in order
for DMP to work. If you use the device mapper driver (although it seems if
using Veritas you'll need this as well) then you'll need to keep a few
things in mind:
- You can't use an XP512, 1024 only.
- System modes 140 and 293 need to be enabled on the XP.
"The E-COPY Response to the Inquiry command is changed, and the volume can
be used from VeritasNetBackUP in heterogeneous OS configuration, such as
Solaris and HP-UX.
Addendum
This mode works in conjuction with System Mode 140. Inquiry page83 for the
XP1024/XP128 has been updated as follows:
If System Mode 140 is ON and System Mode 293 is ON, a descriptor of
Identifier Type = 3 will be added
If System Mode 140 is ON and System Mode 293 is OFF, a descriptor of
Identifier Type = 3,1,2 will be added
If System Mode 140 is OFF and System Mode 293 is ON, there is no change
If System Mode 140 is OFF and System Mode 293 is OFF, there is no change"
ergo the response to a SCSI inquiry on page0x83 will be changed.
- Device mapper atleast only works with RHEL 4 Update 3.
- And keep in mind: mode changes take effect on ALL ports!
As an example:
Device File ALPA Tgt Lun Port CU:LDev Type
Serial#
================================================================================
/dev/sda cc 00 01 CL2A 05:ab OPEN-L*4
0004012x
/dev/sdb cd 01 01 CL2A 01:99 OPEN-L*4
0006305x
/dev/sdc e8 00 01 CL1A 05:ab OPEN-L*4
0004012x
/dev/sdd ef 01 01 CL1A 01:99 OPEN-L*4
0006305x
I've got 2 Open-Ls on two XP 1024s, and I've got two paths going to each
(sda = sdc, sdb = sdd).
The device mapper sees the following:
[root@bes013 dev]# scsi_id -g -u -s /block/sda
0HP______OPEN-L*4________50060e80039cbe1000010000000000000000cc00
[root@bes013 dev]# scsi_id -g -u -s /block/sdb
0HP______OPEN-L*4________50060e8003f6531000010000000000000000cd00
[root@bes013 dev]# scsi_id -g -u -s /block/sdc
0HP______OPEN-L*4________50060e80039cbe0000010000000000000000e800
[root@bes013 dev]# scsi_id -g -u -s /block/sdd
0HP______OPEN-L*4________50060e8003f6530000010000000000000000ef00
And that is the problem. It can't tell that those four LUNs are actually
only two LUNs. Thats what modes 140 and 293 do: changes the way the SCSI ID
descriptors of the LUNs is given by the XP.
I'd be interested in hearing from anyone else thats working on this.
Cheers,
Christian
_________________
Christian Rohrmeier
Schering AG
Corporate IT - Infrastructure and Services
Computer Systems and Operations
System Administration - Research and Development
Luca Berra
<luca.berra@comed
ia.it> To
Sent by: "Giridharan, Prabhu"
linux-lvm-bounces <prabhu.g@hp.com>
@redhat.com cc
linux-lvm@redhat.com
Subject
22.04.2006 09:49 Re: Re: RHAS 3U4 and
LVM , alternate path
Please respond to
LVM general
discussion and
development
<linux-lvm@redhat
.com>
On Wed, Apr 19, 2006 at 04:14:38PM +0800, Giridharan, Prabhu wrote:
>Hello Team,
>
>I have an HP-Itanium server model rx4640 with RHAS 3 update 4 IA64 with
>two Qlogic FC (A6862A- HP part number)and Qlogic 7.07 driver version
>connected to an XP array , We had tried to use the failover capability
>of Qlogic FC card however it seems not to be working even after enabling
>the failover, So we are thinking of opting to the alternate path concept
>in LVM, So kindly let me know whether alternate path are supported in
>above mentioned RH linux version if so please provide the steps for the
>same.
http://h20000.www2.hp.com/bizsupport/TechSupport/DocumentIndex.jsp?contentType=SupportManual&locale=en_US&docIndexId=179911&taskId=120&prodTypeId=12169&prodSeriesId=421487
L.
--
Luca Berra -- bluca@comedia.it
Communication Media & Services S.r.l.
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