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Using NetApp SRA with vSphere SRM and quiescing

Hi there!

My understanding is that SnapMirror doesn't do any quiescing, so as a result you will only get crash consistent backups?

My question is, when using the Storage Replication Adapter with Site Recovery Manage, do you now get  quiescing support, or is it still a no no?

Regards,

Bilal
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piedthepiper
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piedthepiper
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
My understanding is that SnapMirror doesn't do any quiescing, so as a result you will only get crash consistent backups?

Correct.

My question is, when using the Storage Replication Adapter with Site Recovery Manage, do you now get  quiescing support, or is it still a no no?

Storage Replication Adapter creates a FlexClone volume from the latest Snapshot copy of the SnapMirror destination volume and displays the cloned export path or LUN path to Site Recovery Manager.

So as the source is the Snapmirrored, which does not support quiescing, e.g. crash consistent, the SRM is the same. (when using SRA)

Source - Page 9
https://library.netapp.com/ecm/ecm_download_file/ECMP1235991

However, if you use vSphere Replication there is a VSS option, so your SRM VMs will be consistent.
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piedthepiperAuthor Commented:
Right so basically since the DR site snapmirrored volume was never made from a quiesced source, there is no way for it to be anything other than crash consistent! In your expert opinion would you say using this kind of array replication should only be done for stuff that doesn't require VSS/quiecsing?

When it comes to protecting databases etc and making sure they are application consistent, would it be better to use vSphere Replication, or just use the internal replication within SQL, or just recover the databases and lgos froma  solid backup so you have valid logs that can be replayed at the DR site?

This is just a topic I want to get right in my head
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
We dropped "VMware Snapshots" which make Consistent Backups , on 2004, because of ongoing issues, with snapshots being left over after VMware Snapshots are completed, which is part of all backup software including NetApp SMVI.

Therefore we have been using crash consistent VMs for over 10 years without issue, and it works for us, also many other large enterprise organisations, also use crash consistent VMs. (SMVI was not available then!)

This enables us, to just use NetApp Snapshot functions, "as backup", and then Snapmirror to DR sites. It works for us.

I would test it yourselves and prove it works for you.

So we have a crash consistent VM, we then use Database backups to restore the database.

If you want application consistent backups, use VMware vSphere Replication.

Using SMVI, you could create a Consistent Backup, and then also trigger a Snapshot, which would mean it's a Consistent Backup, but you would have to do that for ALL the VMs, on the LUN./datastore at the same time.
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Paul SolovyovskySenior IT AdvisorCommented:
If you are using SMVI, SMSQL,  your Snapmanager application will quiesce the the application.  Once the quiesced snapshots are in place you can schedule your SRM snapshots/replication and it will include your quiesced snapshots as well.  SRM by itself will give you crash consistant snapshots/data.
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piedthepiperAuthor Commented:
exactly what I was looking for
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piedthepiperAuthor Commented:
Ahh So the SnapManager application does that!
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