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December 3rd, 2013 11:00
VNX 5300 snapview snapshot
Hi there,
Scenario:
We have DC to DR Mirrorview/A replication with VNX5300 boxes. DC LUNs replicated to DR and all the mirrors are in consistent-normal state. Now, i would like to take a snapview snaphot of DR mirrored LUN and add to DR storage group. How do i achieve that?
I am unable create snapview snapshot in VNX5300 whereas i can create VNX snapshot. But, i cannot activate VNX snapshot with snapview snap session.
also, please tell me about snapshot mount point and when it will be used?
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Roger_Wu
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December 3rd, 2013 18:00
Have you created enough Reserved LUN Pool? SnapView Snapshot requires it. Please refer to http://www.emc.com/collateral/hardware/white-papers/h1585-clariion-resvd-lun-wp-ldf.pdf
For Snapshot Mount Point, please refer to the whitepaper of VNX Snapshot:
http://www.emc.com/collateral/software/white-papers/h10858-vnx-snapshots-wp.pdf
Snapshot Mount Point (SMP) is a LUN-like container. It is used toemulate a typical LUN, but provides the ability for the host to write tosnapshots and to change snapshots without the need to rescan the SCSIbus on the client.
o17Uu33DCF12520
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December 4th, 2013 21:00
Before taking a snapshot, make sure that the secondary LUN is in a normal condition or fractured, and is not updating. A snapshot of a secondary LUN when MirrorView/A is updating the secondary system will not give consistent data. Also, note that data cached on the server, as well as data written to the primary system but waiting to be transferred to the secondary system on the next update, will not be included in a snapshot of the secondary image.
Next, you can create a snapview snapshot via the unishpere by selecting the secondary lun and click snapview or via CLI by issuing snapview -createsnapview command to achive the creatioin.
VNX snapshot can't be activated while snapview snapshot can be. In VNX snapshot world, it must be, instead, attached to a SMP for host access.
VNX snapshot and snapview snapshot only can coexist on the same pool LUN, because VNX snapshot can't be created on RAID.