and is there a way to see the LUNs that belongs to a RG through Unisphere? : Login to Unisphere, then Go to Storage --> Storage Pools --> select Raid Groups tab --> Select the Particular Raid group. Then you will be able to see the LUN belongs to that particular raid group just below

Thanks, but the RAID Group is a Private one. We created a Pool and not a raid group. We have a Pool 0 that contains a lot of disks and a lot of Private RAID Group. Five disks that belongs to this pool forms a Private RAID Group and they are showing issues with the data. I want to know to which LUNs they belongs so I can know the data they contain.
Thank you ree and I hope you still can help

Thanks,
It's a VNX5300 Block, The messages is "820 Soft media errors Bad Block".
Is it possible to figure out the LUN related to the hole Private RAID Group and not to a single disk ?

When you create a Pool, private RAID Groups are created according to the drive counts you select (4+1 etc).

When you create a LUN and consume the space, it is created in 256MB (for VNX2/ 1GB for VNX1) slices that are distributed across the Private RAID Group(s), and thus the underlying disks. I don't think you can really relate a slice of data to a particular disk in the underlying private RAID Groups.

ALU is the Array Logical Unit, which is used for addressing Array side, and not exposed to any hosts and is fixed.  Unlike a HLU which is definable and exposed to the host for addressing. FLU is the Flare LUN or RAID group LUN.

What issues are you having with the data and what model VNX is this ?

naviseccli -h arraysp -getlun lunid      ........and try the -sftscsi and -private options

You could isolate which disk(s) are causing the errors through unisphere also, and if the counts are high replace them accordingly,

Thanks Brett. One last request. Could you suggest me a good document that explains the concepts of LUNs, ALU, FLU.

Thanks Yogesh, it's much more clear for me.