topic HSG80 connections in failover mode in MSA Storage

HSG80 connections in failover mode

CA997223 — Mon, 27 Oct 2003 21:54:59 GMT

We have an HSG80 pair configured in transparent failover mode attched to W2K servers with single HBAs via a common switch. (no secure path). By default there are two connections per server, one for contraoller A port1 and one for controller B port 2. These are renamed and used for LUN access conttrol.

If controller A fails then port 1 on control B will be active but these connections wont be in the unit LUN access control list..

Is the HSG smart enough to use the existing defined connections or must connections be defined mannually and added to the LUN access list for the failover senario??

Tim Hughes

Re: HSG80 connections in failover mode

david5337_1 — Wed, 29 Oct 2003 06:01:40 GMT

Yes,you are right.

Re: HSG80 connections in failover mode

CA997223 — Thu, 30 Oct 2003 00:20:39 GMT

Yes, its smart enought to do it itself
-or-
Yes, I must define the connection manualy?

Tim

Re: HSG80 connections in failover mode

luke_23 — Mon, 05 Jan 2004 09:29:36 GMT

By LUN ACL I assume you mean the connection aliases to which you enable access to specific units (set d1 access=!newcon12 etc.)?
If so, yes you will have to enable access to all connections. (As you have 1 hba per server and one switch, it's not such a daunting task.)

Once you have enabled access to all available connections, the HSG will then use the appropriate connection for the controller which the unit is online to. Should this connection fail at any point, it will automatically move the unit online to the second controller to utilise that path.

Re: HSG80 connections in failover mode

david5337_1 — Tue, 13 Jan 2004 00:56:07 GMT

Luke,thanks for you detail information.

Re: HSG80 connections in failover mode

Orrin — Thu, 22 Jan 2004 20:10:35 GMT

Hi Tim,

The problem with doing that is windows sees both paths to the same disk and thinks its two disk, hence the necessity for secure path..

hope this helps,

Orrin.