Hi Everyone,
We currently use some low end IBM NSeries for a specific application. All of our other storage is from a large three letter vendor. We have never really considered NetApp for our high end Tier 1 storage.
For our T1 three letter vendor storage we replicate bi-directionally between two datacenters. Years ago we used synchronous replication, but at the last rollover have changed to async replication due to write latencies. It's worked very well. The storage systems are roughly 5-10 seconds out of sync.
I was looking at what OnTap supports for this kind of work. I see that in 7-mode it supports sync and semi-sync. Semi-sync seems interesting for what we do, except that you have to replicate within a Consistency Point. You have until the other half of nvram fills up to complete the current CP with replication. When I looked at C-mode, I can find no mention of sync or semi-sync at all.
Q) Does C-mode support semi-sync?
Q) If not, can normal async snapmirror support replication into the 10-15 second lag range? (note - T1 storage is almost all large Oracle DB's)
Q) Any other idea on how you would implement a low lag async replication with NetApp?
Thanks
Rick
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