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тАО01-11-2010 08:38 AM
тАО01-11-2010 08:38 AM
I was wondering how to determine the decimal LUN/SCSI ID for a disk. on 11iv2 there was a formula that would garner that information. But when I try to use that same formula on 11iv3 it gave the wrong ID's.
Solved! Go to Solution.
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тАО01-11-2010 09:11 AM
тАО01-11-2010 09:11 AM
Re: LUN/SCSI ID on 11iv3
Hope this helps!
Regards
Torsten.
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тАО01-11-2010 09:12 AM
тАО01-11-2010 09:12 AM
Re: LUN/SCSI ID on 11iv3
How about you share the formula. Then maybe with a frame of reference and a few minutes I can give you a new formula.
11.31 uses built in multi pathing, which may be interfering with your formula's ability to do good calculations.
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тАО01-11-2010 10:17 AM
тАО01-11-2010 10:17 AM
Re: LUN/SCSI ID on 11iv3
will explain as per the follwoing example..
disk 1623 0/0/1/1/0/4/0.2.4.0.0.15.7 sdisk CLAIMED DEVICE HP OPEN-E
/dev/dsk/c2t15d7 /dev/rdsk/c2t15d7
disk 239 0/0/1/1/0/4/0.2.4.0.1.0.0 sdisk CLAIMED DEVICE HP OPEN-E
/dev/dsk/c29t0d0 /dev/rdsk/c29t0d0
If you notice, the Calculation of the LUN number is done with the last 3 decimal digits in the H/W path. You have indeed used the correct formula to compute the LUN number. Ex: 0/0/1/1/0/4/0.2.4.0.0.15.7 whould yield me..
0*128 + 15*8 + 7 = 127
That is, LUN number 127.
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тАО01-11-2010 10:34 AM
тАО01-11-2010 10:34 AM
Re: LUN/SCSI ID on 11iv3
What are you seeing ?
11iv3 uses the agile view in order to multipathing to work.
e.g. /dev/disk/disk1, disk2, disk3 etc..
ioscan -m dsf to see the relationship of agile name to device paths.
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тАО01-11-2010 10:55 AM
тАО01-11-2010 10:55 AM
Re: LUN/SCSI ID on 11iv3
/dev/dsk/c64t7d7 /dev/rdsk/c64t7d7
this disk should be lun 63
using the calculation of before it comes up as lun 112
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тАО01-11-2010 11:05 AM
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тАО01-11-2010 11:13 AM
тАО01-11-2010 11:13 AM
Re: LUN/SCSI ID on 11iv3
What it should be doing (with the 0.7.7) is:
(0*128)+(7*8)+7=
0+56+7=
63
What I think it is doing is:
8*(7+7)=
8*14=
112
If you have an automated process that is doing these calculation, you may need to add parenthesis to the formula to make sure things are evaluated as they should be.
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тАО01-11-2010 11:35 AM
тАО01-11-2010 11:35 AM
Re: LUN/SCSI ID on 11iv3
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тАО01-11-2010 11:35 AM
тАО01-11-2010 11:35 AM