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тАО06-10-2008 05:30 AM
тАО06-10-2008 05:30 AM
EVA LUN numbers and Vdisks
1- what is the diffrence bettwen the 2 buttons in the vdisk presentation " Assign LUN " and " Present Vdisk" in the command view the for what i can make they both do the same thing but assign lun gives you the option of selecting the LUN number you want?
2- why do we have a lun number if each vdisk has a uniqe WWN why dose it need a lun number, lun numbers was used to address the lun in relevance to the array uniqe WWN so if EVA assignes a uniqe wwn for the lun this is enough to address the lun at hand why would we need a lun number also ?
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тАО06-10-2008 05:40 AM
тАО06-10-2008 05:40 AM
Re: EVA LUN numbers and Vdisks
1-if you use"Present Disk" button EVA will give the next LUN ID to present it.
But if you use "Assign LUN" button you will assign it manually.
2-EVA use the LUN ID for hosts.
because when you ioscan from the host, you will see the vdisk like cxtxdx.the number of txdx is calculated from this LUN ID.
regards,
mustafa
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тАО06-10-2008 05:51 AM
тАО06-10-2008 05:51 AM
Re: EVA LUN numbers and Vdisks
Hope this helps!
Regards
Torsten.
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тАО06-10-2008 06:13 AM
тАО06-10-2008 06:13 AM
Re: EVA LUN numbers and Vdisks
so mustafa what your saying both buttons dose the same thing but i can use the assign lun to assign a lun ID.
but regardin the lun number im not convinced, bare with me guys lets say there is still some OS's using the lun number there would be a confilct if we assigned 2 difrent luns from 2 diffrent storages with the same lun lets say 1 and 1 ??????????
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тАО06-10-2008 06:22 AM
тАО06-10-2008 06:22 AM
Re: EVA LUN numbers and Vdisks
For example HP-UX will know that thess LUNs are from different arrays (based on hardware path).
The OS will know this, but it could be hard for the admin ... better don't do this.
Hope this helps!
Regards
Torsten.
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those who understand binary, and those who don't.
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тАО06-10-2008 11:47 AM
тАО06-10-2008 11:47 AM
Re: EVA LUN numbers and Vdisks
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тАО06-10-2008 11:50 AM
тАО06-10-2008 11:50 AM
Re: EVA LUN numbers and Vdisks
What is your OS?
Hope this helps!
Regards
Torsten.
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тАО06-10-2008 08:29 PM
тАО06-10-2008 08:29 PM
Re: EVA LUN numbers and Vdisks
> would be a confilct if we assigned 2 difrent luns from 2 diffrent storages with the same lun
No conflict, because there are other entities (controller, bus/channel, target) which are used to form a full address.
Different ports from the same or another storage array are simply mapped to different SCSI target addresses.
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тАО06-11-2008 06:09 AM
тАО06-11-2008 06:09 AM
Re: EVA LUN numbers and Vdisks
and yes its true the N_PORT ID is 64 bit addresses, and 128 bit are LUN addresses. i am talking about the 128 LUN addresses - the UUID of a vdisk - , so what are you saying Uwe this is assigned for a vdisk by the eva but its not used for host to LUN addressing ?
actually i read a piece of info somewhere im not sure of it that the UUID is assigned by the storage system for internal addressing acctually if i remember correctly it stated the storage system assignes a 128 bit Uniqe identifier for each object in the storage for internal addressing is that correct and is that what the vdisk UUID used for ?
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тАО06-11-2008 10:45 AM
тАО06-11-2008 10:45 AM
Re: EVA LUN numbers and Vdisks
> the UUID of a vdisk ... its not used for host to LUN addressing ?
No, not the UUID, and not the LUN WWN. A UUID is used to persistently identify an object (disk drive, controller, host, vdisk, ...) _within_ an EVA and does not change. By default, the LUN WWN has the same value as the UUID, but you can be changed it if the VDisk is not presented to a host.