topic How many Luns can my server accept from a 2012sa Disk Array in Disk Enclosures

How many Luns can my server accept from a 2012sa Disk Array

Dan_394 — Fri, 31 Jul 2009 15:42:16 GMT

Hi

This is the first time I am using LUNS/WWN's. I have a HP 2012sa disk array attached via two HP SC08Ge HBA's to a DL380 G6.

I made a volume with 128 vdisk's of 7GB each. I ticked 28 of them and assigned them to one WWN of one of the controller ports. When I rebooted the server in the bios it only picked up 7 of the vdisks.

1) Is there a reason for this? Is there some limitation?

2)If so where is the limitation the DL380 G6 or the HBA's or the 2012sa?

3)How can I overcome this limitation?

4) Is there any documentation around this?

Thanks
Dan

Re: How many Luns can my server accept from a 2012sa Disk Array

Dan_394 — Mon, 03 Aug 2009 09:31:46 GMT

Hi Everyone,

Can someone please help me with this? It may even be a lack of understanding in me on how LUN's and WWN's work so any help would be appreciated.

Thanks
Dan

Re: How many Luns can my server accept from a 2012sa Disk Array

Jonathan Benavides — Mon, 03 Aug 2009 20:45:58 GMT

There are limitations for the number of Luns (volumes) you can map in that configuration from the MSA/HBA side, but it seems you are not excedding them:

Maximum # of luns to map per MSA2012sa: 255
Maximum # of luns mapped per SC08Ge: 128

Supported cable configurations:

http://bizsupport1.austin.hp.com/bc/docs/support/SupportManual/c01612749/c01612749.pdf

I would start by confirming everything is properly cabled, then check the volume mapping to make sure each server is seeing what it should.

MSA2012sa user guide:

http://bizsupport1.austin.hp.com/bc/docs/support/SupportManual/c01505786/c01505786.pdf

MSA 2000 reference guide:

http://bizsupport1.austin.hp.com/bc/docs/support/SupportManual/c01565941/c01565941.pdf

Also, remember windows can run out of drive letters and you might need mount points to see the volumes.