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msa500 + 4 dl380g4

 
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msa500 + 4 dl380g4

Hi all!

We have an msa500 + 4 dl380 servers. As far as I know in msa500 there are 2 scsi buses. So 2 dl380 shares an SCSI channel (they have smart array 642 installed). I suppose the ID of their controllers are 7 (by default).

How can I check what ID they use? If there is a collision, can I change one of the controller's ID to something else?

Krisztian
5 REPLIES
Doug de Werd
Honored Contributor
Solution

Re: msa500 + 4 dl380g4

You do not need to change the SCSI ID in this situation - in fact, it is not possible to change it. The MSA500 has special circuits on the 4-port SCSI module that coordinates access to the storage unit. The MSA500 actually has 4 SCSI buses, and this circuit arbitrates across them for access.

The main thing to do is to set up Selective Storage Presentation (SSP) using the Array Configuration utility (ACU). With this you will set specific access rights for each of the LUNs to the servers.

Look on pages 46 and 63 of this document for more information:

http://h200001.www2.hp.com/bc/docs/support/SupportManual/c00182750/c00182750.pdf

Thanks,
Doug
Expert in ProLiant Clusters

Re: msa500 + 4 dl380g4

I want all nodes to access all LUNs, ie they function as adoptive nodes for each other. Do I need SSP in this situation?

I plan to run 7 packages with one disk volume for each. Do I need to make 7 LUNs, or can I group them, using volumes?

Thanks!
KrisztiÃ
Doug de Werd
Honored Contributor

Re: msa500 + 4 dl380g4

In general you cannot have all servers access all LUNs at the same time unless you have some additional software that manages disk access. If you try to set it up this way (with all servers accessing all LUNs), YOU WILL CORRUPT YOUR DATA! Do not do it.

The best thing I can think of to do this is with a product called PolyServe. HP has a very close relationship with PolyServe, and it will do exactly what you want. Also, you do not want to set up traditional clustering - instead use PolyServe's clustering capabilities.

Here is some more information:

http://h71028.www7.hp.com/enterprise/cache/70995-0-0-225-121.html

http://h21007.www2.hp.com/dspp/mop/mop_PartnerDetails_IDX/1,2718,1489,00.html

http://www.polyserve.com/hp/index.php

Thanks,
Doug
Expert in ProLiant Clusters

Re: msa500 + 4 dl380g4

I meant the nodes would not access these partitions concurrently. Just a standard ServiceGuard solution: if one node fails, the other mounts the partition and starts the service.

Do I need SSP in this situation? Do I have to make virtual disks for each package or volume groups are just do the job?
Doug de Werd
Honored Contributor

Re: msa500 + 4 dl380g4

You use volume groups for each package, which can contain multiple logical volumes if you want. here is some good info from the ServiceGuard docs:
http://www.docs.hp.com/en/B9903-90012/ch03s06.html#cjafcfjh

You still need to do SSP to make sure that all nodes can see all of the disks. With an MSA500, this is not a really big deal because you typically will not be sharing the MSA500 with servers outside of the cluster. SSP (and switch zoning) become much more important when you start using bigger storage boxes (like EVA) where you have many servers (clustered and standalone) sharing the same physical storage box. Then it is really important to make sure that SSP is set [properly.

Thanks,
Doug
Expert in ProLiant Clusters