HPE EVA Storage

EMC CX300 Can I have one RaidGroup's LUNs scattered into two different Storage Groups?

 
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Steve Post
Trusted Contributor

EMC CX300 Can I have one RaidGroup's LUNs scattered into two different Storage Groups?

EMC CX300 disk array, HPUX11.23 two rp4440's. Connected via 2gig fibre.

Let's say:
I have Raid Group 1 with luns: 01 02 03 04 05
I have Raid Group 2 with luns: 11 12 13 14 15
I have Storage Group A with luns 01, 02, 03
I have Storage Group B with luns 11, 12, 13

Can I add Luns 04, and 05 to Storage Group B? Or is this a bad idea because I would be spreading Raid Group 1's luns into two separate storage groups?
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Stephen Kebbell
Honored Contributor
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Re: EMC CX300 Can I have one RaidGroup's LUNs scattered into two different Storage Groups?

Hi,

that should not be a problem. It does not matter what RAID-Group is being used.
Think of it as two separate layers:
Physical: you create your RAID-Groups and "carve" your LUNs out of these RGs.
Logical: determine which LUNs can be accessed by which hosts by creating storage groups.
The only potential issue is performance, as the LUNs are sharing the same physical disks. So if one LUN has a very heavy write I/O load (more than the cache could handle), it could influence the performance of the other LUNs.

The bad idea would be putting one LUN into two different storage groups. That would result in data corruption, as two hosts could write to the same blocks.

Regards,
Stephen