cancel
Showing results for 
Search instead for 
Did you mean: 

SAN Fabric ISL Link Failure / VCS Failover

bob1_skew
Level 2

I posted a question here on the HA forum (https://forums.symantec.com/syment/board/message?board.id=1&thread.id=3173) and have been advised that my question may be better posted here.

 

In a VCS stretched cluster using VxVM to mirror data between the sites, will VxVM provide a message, warning or error when the ISL's SAN fabrics between the sites are broken?  How long should this notification take? The volumes have been presented as Dynamic, Mirrored Concatenated and in VCS the VMDg force import setting is set to true.

 

Is my understanding of an ISL link failure correct with VCS/VXIO? For example, a failure situation occurs where all ISL communications are lost between sites while the application is active in the Production site. In this case, all resource groups will continue to function normal as the storage is alive at the production site – no data being mirrored to the DR site at this point as all ISL links are down.

 

An hour after this ISL link failure occurs, the production node (or indeed site) experiences a failure which causes its groups to fail over to the DR node. At this point, what does the DR node do? Will it bring this group online and import the disks from the DR array and thus be missing the last hour’s transactions since no ISLs where available to update the remote array?

 

Thanks

 

Message Edited by bob1_skew on 01-06-2009 12:57 PM
1 REPLY 1

Kimberley
Level 6
Partner
The thread, with response, is available from:

http://www.symantec.com/connect/forums/san-fabric-isl-link-failure-vcs-failover?sym=TRUE