Preparing for excam: Questions about ISMV2

And finally the last bunch of questions =D

• Classic LUN 2x faster because active active acces via both SPs,  is that true on a VNX?
• Fast VP also for File System on a unified machine?
• Whats the filesystem name of the FS on a unified machine?
• Autonomous Shaers for clients possible? LDAP  Integration? ACLs managable by share?
• how to backup those shares?
• anyway to see the usage of fast cache?
• where to check eligible luns for fast cache?
• when is data in DRAM cache and when in fast cache???
• whats the interface of SSD disks withing EMC FC or SAS?
• FC multiple paths LB and Failover?
• overview of all vmware emc snapins for VAIA VSI VADP, need to do anything to use capabilites? How to integrate within vSphere Client?
• traditional luns on raid group also thin an thick or only thick?
• is dedup and compression as well as qos part of a suite or dedicated software? is it always with the array or do we need to buy?

So that's it so far! Thank you so much guys, really appreciate your effort to share your know how.

Cheers,

Duke

Hi guys

I am in the end phase of preparing! Soon I am going to take the excam. I found a lot of questions, white papers, blue prints etc. etc.

I've only difficulties with one type of question, it is about the follwing.:

A department in an rganization requires 300 GBN of storage space for business application. The production LUN is RAID 1+0 protected and has both a local and a remote replica. Rhe local replica is a RAID 1 LUN and the remote replica is on a fice disk RAID5 LUN.

If the raw disk storage costs per GB is 3 dollar, what is the charback cost to the department for applicaiton storage?

I've calucalted the following:

It's a RAID 1 + 0 so first mirrored then striped

R0= R1(150+150) + R1(150+150 GB) = 600 GB

Plus R1 300GB + 300 GByte Local replica = 600 GB

Plus R5 300 Gbyte = 300 GB

Overall 1500 GByte Space consumption * 3 Dollar each =  4500 Dollar

But the right answer seems to b e 4725$

I really dont get it...

1) Is my assumption correct that i dont need 300 GByte disk within RAID 1+0 because striping i can use 2x 150 resp 4x

2) where is my bug? When i take 4725$ and device it with 3 dollars it gives me an GB amount of 75GB so where is this coming from?

Thank you so much

Hint: how are you able to provide R5 protection without using capacity for parity ?

> Plus R5 300 Gbyte = 300 GB

you are missing the parity of Raid5

Raid 5 on 5 disks (4+1)

300 GB (data) + 75 GB (parity) = 375 GB

So in sum it is 600 + 600 + 375 = 1575 GB * 3 $ = 4725$

Good day all,

    Please explain FAST VP and FAST Cache,

Also, FAST in terms of both.

Thanks

Shr@y wrote: Good day all,     Please explain FAST VP and FAST Cache, Also, FAST in terms of both. Thanks

Some light reading;

https://support.emc.com/docu48729_FAST-Cache-and-FAST-VP-for-VNX-OE-for-Block-5.33.000.5.015-Release-Notes-.pdf?language…

FAST VP = automatic movement of blocks between differents tier disks in a pool

FastCache = caching of frequently used blocks on flash drives

You will find the more explanations in the VNX white papers – available from support.emc.com or emc.com

https://store.emc.com/gb/Solve-For/STORAGE-PRODUCTS/VNX5200/p/VNX-VNX5200-storage-platform?PID=EMC_PRD-VNX5200-BB7D_SPLSH#Learn

I would rather suggest the white paper than the release notes.

If the FAST VP and Fast Cache white papers are too deep then there is also the introduction to the VNX white paper.

FAST (Fully Automated Storage Tiering) contains two types of features. But both

These features included in FAST Suite license in VNXe and VNX platforms.

1. FAST Cache

FAST Cache means you can extend the cache by adding SSD in VNXe and VNX platforms. FAST Cache improves performance in terms if IOPS since per SSD IOPS count is high. When you enable tiering and activate FAST Cache feature for that particular LUN hot data will be migrated to FAST Cache with 64kb data chunks. There is a maximum limit you can extend the FAST Cache for each platform. Recommended RAID is to go with RAID 10 for FAST Cache.

2. FAST VP

FAST VP means FAST Virtual Provisioning which enable auto tiering for LUNs that extended to more than one disk type. Disk types are SSD, SAS and NLSAS. Enabling FAST VP you can move data between different disk tiers (from NL-SAS To SSD and from SSD to NL-SAS). This gives better performance when required by upgrading hot blocks to high performance tier. Here the moving block size is 256MB.

These features are Fully automated and EMC storage is intelligent enough to identify when to upgrade and when to downgrade the data between tiers. There is no manual intervention to move data between tiers.

Regards,

Rishan.

+9477 00 52 522

Sent from my iPhone

Rainer_EMC wrote: I would rather suggest the white paper than the release notes. If the FAST VP and Fast Cache white papers are too deep then there is also the introduction to the VNX white paper.

If someone has no concept of the features like the poster, the Release notes I linked have an excellent "Product Description" for both features/products beginning on Page 2. It summarises them very nicely without going into too much depth, all in just a few paragraphs. They are well written.

Of course, further info and technical details can be garnered from the White Papers.

Hi

while i was writing my question about this resp. about my confusion I realised that I have to calucalte 300 GByte / 4 * 5 to get the parity or the whole amount. Jesus... sometimes I am a little dum****

Thanks =)

Hey guys

I just would like to let you know that I've passed the excam with excellent score! Well this is your earnings as well, I really would like to thank you all for your help!

Cheers

PS: Right now I am studying for the Implementation Engineer Exper Excam for VNX, so be prepared

PPS: IN addition can you have a look at those questions which have not been answered yet?

And finally the last bunch of questions =D

• Classic LUN 2x faster because active active acces via both SPs,  is that true on a VNX?
• Fast VP also for File System on a unified machine?
• Whats the filesystem name of the FS on a unified machine?
• Autonomous Shaers for clients possible? LDAP  Integration? ACLs managable by share?
• how to backup those shares?
• anyway to see the usage of fast cache?
• where to check eligible luns for fast cache?
• when is data in DRAM cache and when in fast cache???
• whats the interface of SSD disks withing EMC FC or SAS?
• FC multiple paths LB and Failover?
• overview of all vmware emc snapins for VAIA VSI VADP, need to do anything to use capabilites? How to integrate within vSphere Client?
• traditional luns on raid group also thin an thick or only thick?
• is dedup and compression as well as qos part of a suite or dedicated software? is it always with the array or do we need to buy?

So that's it so far! Thank you so much guys, really appreciate your effort to share your know how.

Cheers,

Duke