RobertoAraujo1
3 Argentium

Ask the Expert: Advanced Snapshots on VNX

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https://community.emc.com/thread/168082

Welcome to this EMC Support Community Ask the Expert conversation. This ATE session will be covering EMC Advanced Snapshots. Among the many areas we will be discussing, our experts will answer your questions in regards to best practices, supported configuration and  any further questions regarding the advantages of using Advanced Snapshots over traditional Snap View.


Your Host:

profile-image-display.jspa?imageID=10191&size=350Wayne Brain has been a Tech Support Engineer at EMC for the last 30 years. He co-develop midrange platform training for Ed Services and Tech Support. Wayne has helped open and mentor technicians in eight different support centers around the world. He's worked in 14 different countries for EMC on the Fly and Fix team.

This discussion will be take place May 12 - 30.


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>> Join the next Ask the Expert: Advanced Snapshots on VNX. http://bit.ly/1ijmlhv 5/12 - 5/30 #EMCATE <<

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12 Replies
RobertoAraujo1
3 Argentium

Re: Ask the Expert: Advanced Snapshots on VNX

This discussion is now open for questions. We look forward to a lively and informative event.

Best regards,

Roberto

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dynamox
6 Gallium

Re: Ask the Expert: Advanced Snapshots on VNX

why is the requirement to convert "thick" pool LUNs to thin LUNs when using VNX Snapshots ? I have Oracle DBs that are not necessarily thin friendly so we have been using "thick" LUNs.

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ClariionBrain
1 Copper

Re: Ask the Expert: Advanced Snapshots on VNX

The Thick lun is still classified as a Thick lun but behind the scenes it does convert from direct to indererct in 8KB Blocks when writes come to the Thick snapped lun to align itself with the 8KB granularity of the VNX Snapshot.

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ClariionBrain
1 Copper

Re: Ask the Expert: Advanced Snapshots on VNX

Sorry about the spell check.

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dynamox
6 Gallium

Re: Ask the Expert: Advanced Snapshots on VNX

ClariionBrain wrote:

The Thick lun is still classified as a Thick lun but behind the scenes it does convert from direct to indererct in 8KB Blocks when writes come to the Thick snapped lun to align itself with the 8KB granularity of the VNX Snapshot.

I don't understand what you just wrote. Are you saying thin LUNs have specific "characteristics" that are prerequisite for VNX snapshots ?

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ClariionBrain
1 Copper

Re: Ask the Expert: Advanced Snapshots on VNX

I was referring to the explanation in the VNX Snapshots White Paper.  I have added the link to that document below.  Look at page 9 and page 10 for further details.  I hope this helps.

https://support.emc.com/docu48702_White_Paper:_EMC_VNX_Snapshots.pdf?language=en_US

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dynamox
6 Gallium

Re: Ask the Expert: Advanced Snapshots on VNX

thanks, does the entire "thick" lun gets converted to "indirect" or only portions of the LUN where writes occur ?

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ClariionBrain
1 Copper

Re: Ask the Expert: Advanced Snapshots on VNX

Only the portions where the write occurs.

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dynamox
6 Gallium

Re: Ask the Expert: Advanced Snapshots on VNX

excellent, thank you.

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