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March 24th, 2017 06:00
Oracle VM admin asks for page 83 id in a LUN
I have 2 Unity 400 arrays and synchronous replication is in place for a couple of LUNs.
From Unity 1 I'm replicating a LUN to Unity 2 and also the other way around.
I have an Oracle VM cluster attached to each of the two arrays and the Oracle VM administrator is asking me about a page 83 item which seems to be different on each LUN / Replica LUN pair. He says the page 83 item needs to be identical on each Primary / Secundary LUN pair.
I don't know where to set this data and one of the posts I can find on this is one from 2008 which addresses a Symmetrix and some SPC-flag.
Does anyone know what this page 83 thing is about?
maniemc
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April 4th, 2017 21:00
Q : the Oracle VM administrator is asking me about a page 83 item which seems to be different on each LUN / Replica LUN pair. He says the page 83 item needs to be identical on each Primary / Secundary LUN pair.
Finally, tried to test this out in lab and noticed that, it cannot be identical as the page 0x83 scsi id derived based on WWN (in my test, it just added number 3 in front of wwn).
In Unity, Replication creates a new dest lun first (different wwn) and then it syncs data from source.
service@unity spa:~> uemcli -no /stor/prov/luns/lun show -filter WWN
1 wwn = 60060160b71a7820f668e4585f5b68d4 (this is source lun)
2 wwn = 60060160b71a78209971e458c77bdf44 (this is dest lun)
And a remote unity array as dest:
service@unity2 spa:~> uemcli -no /stor/prov/luns/lun show -filter WWN
1 WWN = 60:06:01:60:B9:3A:78:20:5D:67:E4:58:62:FA:6C:15 (dest)
At a linux host:
[root@RH ~]# /usr/lib/udev/scsi_id --page=0x83 --whitelisted --device=/dev/sdb
360060160b71a7820f668e4585f5b68d4
[root@RH ~]# /usr/lib/udev/scsi_id --page=0x83 --whitelisted --device=/dev/sdc
360060160b71a78209971e458c77bdf44
[root@RH ~]# /usr/lib/udev/scsi_id --page=0x83 --whitelisted --device=/dev/sdd
360060160b93a78205d67e45862fa6c15
RRR
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March 28th, 2017 04:00
The page 83 item is also known as the WWID, not to be confused with the WWN or UUID.
The WWN / UUID will not be replicated to another array and will be different, but what the WWID is is unknown to me. I've opened a case with Dell EMc and the CSE doesn't know what this WWID is either.
Can anyone shed some light on this?
maniemc
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March 28th, 2017 14:00
what document is that?
RRR
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April 3rd, 2017 00:00
it's not a page in a document, but a page in memory or something. It's Oracle VM specific and I can't find any information anywhere, that's why I'm asking here
Rainer_EMC
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April 3rd, 2017 07:00
He is talking about VPD page 0x83 from the SCSI inquiry command
see Manpage of SCSI_ID
RRR
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April 4th, 2017 03:00
So if I read this article correctly, this identifier cannot be exactly the same, ever. In my case the Oracle VM admin wants to have this identifier of a LUN on Unity 1 to be the same on its replica LUN on Unity 2, which replicates through synchronous replication.
The only way to get this identifier the same on 2 hosts, is when they're accessing the exact same LUN (on a single storage system).
Correct?
Rainer_EMC
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April 4th, 2017 05:00
I think so but I am not the FC expert - Vplex might be different
Did you check the Solaris host config guide ?
RRR
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April 4th, 2017 23:00
Thank you very much! This proves the theory that I had as well.