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32 Posts
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1648
May 22nd, 2012 00:00
what is the use of dummy lun with host id0 ?
In clarrion, while creating luns in storage group first we are creating a dummy lun with host id 0. what is the use of this dummy lun ? what is the recomended size of this lun ??
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rupal1
433 Posts
0
May 22nd, 2012 01:00
The concept of dummy lun in technical terms is called as Creating a Lun z. LUNz has been implemented on CLARiiON arrays to make arrays visible to the host OS and PowerPath when no LUNs are bound on that array. When using a direct connect configuration, and there is no Navisphere Management station to talk directly to the array over IP, the LUNZ can be used as a pathway for Navisphere CLI to send Bind commands to the array. LUNz also makes arrays visible to the host OS and PowerPath when the host’s initiators have not yet ‘logged in to the Storage Group created for the host.
So in all this lun is created to check the connectivity between the array and the host before we bind the actual luns on the array and present it to the host.
Thanks
Anirudh_Banerje
59 Posts
1
May 22nd, 2012 02:00
Hi Jeeson
I would suggest you to go through the below primus article from powerlink for detais on LUNz
primus # emc65060
LUNz is referred as a fake logical unit zero presented to the host automatically so that the host software (powerpath) can send configuration commands to the array, when no physical LUN is assigned to the host. The LUNz is replaced when a valid LUN with LUN ID - 0 is assigned to the host.
Thanks
Anirudh