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HSG80 connections in failover mode

 
CA997223
Occasional Visitor

HSG80 connections in failover mode


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
5 REPLIES 5
david5337_1
Regular Advisor

Re: HSG80 connections in failover mode

Yes,you are right.
CA997223
Occasional Visitor

Re: HSG80 connections in failover mode

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

Tim
luke_23
Occasional Visitor

Re: HSG80 connections in failover mode

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.

david5337_1
Regular Advisor

Re: HSG80 connections in failover mode

Luke,thanks for you detail information.
Orrin
Valued Contributor

Re: HSG80 connections in failover mode

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.