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General Mobilink & Sybase Questions

Posted on 2007-12-05
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Last Modified: 2010-08-05
I am currently looking into Sybase and the Mobilink product.

What I am looking to do is have 2 servers up and running. Each Server holds a database and I obviously want the user to access these databases.

So I am looking for general information (from peoples experience not documentation or help files ;) )

1. Is it possible to setup a monitor that keeps track of which Server is up and which Server should be used?
2. How is Syncing handled? Do I need to manually sync the DB's at various time frames or can the DB's handle this themselves?
3. If a server goes down, is there a mechanism that will transfer across to the other Server & DB.
4. What tools or helpers are provided that would help with keeping the DB's up 99.9% of the time.

Cheers
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Question by:directxBOB
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grant300 earned 2000 total points
ID: 20413358
It sounds as if your questions has less to do with Mobilink and more to do with creating a High Availability (HA) server environment.

There are a three ways to create an HA Sybase (ASE I presume) server.

The first is to use Replication Server to keep the second (standby) server consistent with the master server, at least up to the minute.

The second is to use the Sybase HA failover mechanism whereby both servers are connected to the same SAN disk array.  When the master server fails, the standby server grabs the disks and picks up from there.  This works where you have more serious hardware with a SAN that uses a highly reliable disk array, e.g. RAID, dual controllers, batter backed cache, dual path disks, redundant power supplies, dual host bus adapters, and dual Fiber Channel switches.  At that point, you assume the disk array is not going to fail but you still need a standby server box.

Finally, ASE 15 now supports clustering.  This allows both servers to be online and servicing requests.  When one fails, the other is forced to pick up all of the load but things still function.  Again, you still need a SAN with reliable disk arrays but you get the advantage of not paying for a standby server that sits there doing nothing most of the time.  This is by far the most transparent way to implement an HA system.  It provides for things like rolling upgrades and other neat features that make running the site easier.

99.9 percent uptime is still 8+ hours of downtime a year.  If you can live with that, you can use one of the techniques other than clustering.  If you need reliability higher than 3 nines, clustering is your best bet and takes care of all the connection failover issues for you.

Regards,
Bill
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