SAN only for VM Disaster Recovery replication

I am part of the talks for a recovery site that will not be replicated SAN data warehouses. So, we have an essentially empty ESXi environment with LUNS replicated data store. In the case of a DR, the plan would be to start the import of virtual machines in the DR ESX environment. I've never seen replication strict SAN has offered as a solution of Dr. ignore the logistics around IP, naming, etc. I want to focus on the consistency of the VMs who grew up and which have been replicated like that.

  1. My hypothesis is that the system VMs would probably upward in a consistent state of failure. Is that correct or could I do not affirm the VM would be healthy at all.
  2. If the virtual machine is running, I guess that the integrity of any application or DB data on these virtual machines would be suspect.

As I said, I never considered this scenerio. Most of the solutions I've seen using an application layer to maintain compatibility in different time intervals. Just curious if anyone has had experience with this kind of recovery.

vmproteau wrote:

Just curious if anyone has had experience with this kind of recovery.

Hi vmproteau,

This works perfectly.  I made thousands of these movements of the virtual machine in a uniform way down with a success rate of 100%.  The portability that we all talk about is real.  He works for me very well since 2005 when I started with EMC SRDF.  I also had great success with SnapMirror of NetApp.  If you have any kind of enterprise storage, you should be fine.  In addition, modern guest operating systems are extremely resistant to crash-compatible power (i.e. 2008 R2 is a dream come true).  In addition, I have never had a problem with NT 4.0, 2000 or 2003 in my data center migrations or exercises of DR.

Nowadays, most DBAs use something like SQL LiteSpeed and Idera to create local backups on of additional vmdk attached to the virtual machine.  If a recovery of a painting is necessary for example, they can obtain this granular coverage using these products.  Yet once again, I never had a problem with SQL put online following a crash-consistent (i.e. test DR, moving to DC or power event HA).  Of course, YMMV and you must test for your specific environment.

With respect to the RPO, it is to you to determine how often the table performs the replication.  More often = more money, of course.  You can also get more granular on the SQL backup points.  For many, a backup per day is fine.  Others take Idera SQL backups every 15 minutes for example (a slight exaggeration!).

On OTN... The biggest risk for your RTO is the lack of organization and preparation (update document and books run scripts!).  In addition, having good PMs to manage the application mapping and interdependencies is essential.  You'd be surprised to know how many tests application fails due to host files, order DNS or boot of VMS (i.e. Ideally you should show AD/DNS, then SQL, then App, then Web).  Practice makes perfect.  PowerCLI is your friend here.

Unless the plan is to re - ip, this place DR must be built as totally isolated with dedicated physical Firewall (or many sessions of sniffer and excellent ACL).  If you choose SRM (as it should!), a large part of this risk is avoided since you can test in the bubble.  Many companies bit on correct insulation and end up hurting prod during the test.  Don't, don't.  Physical Citrix is particularly vulnerable to this and is often required for DR since many apps is published exclusively via Citrix.  Often, the Citrix server will eventually be multihomed (so the company doesn't have to pay for additional SQL and Citrix license servers, etc.) and will be riding the Prod and isolated environments.  The default behavior is that the Citrix user will get the same routing as the underlying Citrix server so the risk is that they can connect by mistake for prod.  You must study it well.

Not to mention that Citrix, other considerations ensure good VPN and other mechanisms on the DR site (which will be used for actual testing of isolated app and DR).  Have several new hubs according to the needs and requirements of the network.  This, along with time, often being saved at the end, but are important to your success and should be reviewed as soon as possible.  In addition, to maintain the volumes that you both own (i.e. no laggard vmdk who are orphans, etc.).  Use scripts to check RVTools or Vsante to remain vigilant on this.  What get is replicated on the other side should be clean.  Only what you need.  Each vmx that is there should be one that gets recorded.

Anyway, with the replication table, this project should be a slam dunk.  Don't worry so much the market crash-compliant of your guests.  It works.

Tags: VMware

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