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тАО08-18-2005 07:30 AM
тАО08-18-2005 07:30 AM
we have set up 256 LUNs in our XP12000. Those are presented via 4 HBAs to the host, which are seen 1024 times.
Now we configured autopath to Round Robin those LUNs, so only 256 LUNs should be adressed to Oracle ASM. Ist this the correct procedure?
We chmodded all /dev/rdsk/* device files related to those LUNS (chown oracle:dba, chmod 660).
So we get the usal output of "autopath display all"
Details for path : /dev/dsk/c6t2d0
Load Balance Policy : Round Robin
=========================================================
Device Paths Device Status
=========================================================
/dev/dsk/c6t2d0 Active
/dev/dsk/c10t2d0 Active
/dev/dsk/c14t2d0 Active
/dev/dsk/c18t2d0 Active
=========================================================
Oracle ASM is supposed to adress one raw device per LUN. So i suppossed giving /dev/rdsk/c6t2d0 should be a valid device for Oracle ASM.
Now ASM complains about having this device four times and on top of that ist complains about the device beeing already used.
ASM won┬┤t work this way? But why?
Any ideas?
What┬┤s the trick about ASM and autopath?
OS is 11.23v2 Itanium on a rx4640
best regards
tanx for any help ;)
Solved! Go to Solution.
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тАО08-19-2005 12:46 AM
тАО08-19-2005 12:46 AM
Re: Oracle ASM - XP12000 - autopath - how to adress raw devices
as you mention its seems that ASM cannot handle the same disk twice (or more !).
check this link
http://www.oracle.com/technology/tech/linux/asmlib/multipath.html
and also Metalink doc id 309815.1 "Configuring Oracle ASMLib on Multipath Disks"
Regards
Jean-Luc
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тАО08-19-2005 01:04 AM
тАО08-19-2005 01:04 AM
Re: Oracle ASM - XP12000 - autopath - how to adress raw devices
Is there a possibility to configure securepath or autopath to only present 1 device file four 4 LUNS? I wouldn├В┬┤t know - can someone verify that?
I was wondering about configuring 16 LUNS via LVM to be one rlvol, which can be used by ASM. This solution was denied by the oracle engineer.
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тАО08-19-2005 01:08 AM
тАО08-19-2005 01:08 AM
Re: Oracle ASM - XP12000 - autopath - how to adress raw devices
The posting above is my response
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тАО08-19-2005 04:10 PM
тАО08-19-2005 04:10 PM
Re: Oracle ASM - XP12000 - autopath - how to adress raw devices
i don't know if this will help, but still can you check the ASM_DISKSTRING parameter.
regards
yogeeraj
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тАО08-19-2005 08:53 PM
тАО08-19-2005 08:53 PM
SolutionI wouldn't point Oracle at /dev/dsk anyway - beetter to create soft links so you can easily move things around later if you want to...
mkdir /dev/asm
ln -s /dev/dsk/c6t2d0 /dev/asm/disk1
ln -s /dev/dsk/c6t2d1 /dev/asm/disk2
etc...
ASM_DISKSTRING=/dev/asm
or something like that...
HTH
Duncan
I am an HPE Employee
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тАО08-20-2005 05:48 PM
тАО08-20-2005 05:48 PM
Re: Oracle ASM - XP12000 - autopath - how to adress raw devices
Now my conjecture, ASM has to handle the multiple LUN management not Seurepath is prooven...
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тАО01-15-2008 11:01 AM
тАО01-15-2008 11:01 AM