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Can Lifecycle replace Disk Staging in D-D-T Architecture?

Created: 23 Jun 2013 • Updated: 10 Sep 2013 | 11 comments
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In the case of Disk Staging solution, I’d have to use NDMP to dump data to the tape. However, the problem with that is losing the ability of recovering in granular file level.

To avoid the problem, I am thinking the solution of using Lifecycle policy, as I understand, it is not NDMP based, so, I can recover data in file level.

Please correct me if there is anything conceptually incorrect. If what I am thinking here is correct, can I use Lifecycle to replace Disk Staging in D-D-T architecture?

I’d appreciate your advices very much!

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RamNagalla's picture


yes Storage  life cycle(SLP) do support the D-D-T (disk -disk-Tape) , and this is the better way of managing the backup images then the disk Staging..

all you need to do is Design your SLP which fits bets to your enviornment.. check the best parcticies and all.

besides.. could you expline what does it mean losing the ability of recovering in granular file level when you use the NDMP to dump data to tapes?

StefanosM's picture

There is not netbackup disk solution that is using NDMP to dump data to tape. At least as far as I know.

Can you give us more information what you mean? Probably you have a disk appliance that is using NDMP commands to move data to tape.
How are you scheduling the disk to tape duplication now?

When I was having a product briefing for a disk based solution, it was clear to me that the tape image that was generated from the disk storage with NDMP commands was known to netbackup as another backup copy and directly readable for file restore.

I do not see how SPL will help you as it will use the same way to move data to tapes.

SLP does not have to do with the actual backup data, but it is set of storage units and retentions of your backups.

What ever you do, you will loose the ability to restore mailboxes. You have to have your backup to disk to restore mailboxes. 

nbmagic's picture

Sure. Currently we don't have D-D, all we are doing now is to backup data to a tape library.

We are planning to backup data to Disk first by setting up a Disk staging storage unit. the Disk here will be   NetApp appliance, and then from there dump data to the tape via NDMP since NetApp appliance supports NDMP. However, as far as I know, when we restore data from the tape, I would have to restore the entire volume, I could not go down to the file level, and restore only files I want.

I am thinking instead of using NDMP dump, I should use SLP, and it will give me the granularity when I want to restore particular files only.

When you say whatever I do, I could not drill down to restore a mailbox (a file in my case) only ?

Am I missing anything?

Thanks you both!

StefanosM's picture

SLP and NDMP is something like oranges and pasta, nothing in common.

You will use SLP to start the duplication of your backup, ether with standard method (netupp to media server to tape) or NDMP commands (netapp to tape).

I will check it again.
My knowledge is that when you are using the direct to tape option of netupp. NDMP is used only to send commands to netupp and the tape is fully readable and cataloged from netbackup. But as I have not use it, I may be wrong.

Nicolai's picture

Stefanos is right. NDMP is not a data carrying protocol it a control protocol. Very often you connect your NDMP filer direct to tape. This is why NDMP is "fast". 

In order for backup to go to disk you need to configure remotey NDMP. But that mean all data from the filer will go via IP to a Netbackup media server. This is not "fast".

Pls see :

Assumption is the mother of all mess ups.

If this post answered your'e qustion -  Please mark as a soloution.

StefanosM's picture

I'm reading the threat and I have the filling that something is wrong.

can you confirm that you are going to backup your data to the netapp and then use another policy to backup this disk backup to tape using NDMP?

OR you are going to use the NDMP direct copy as described at the NetBackup for NDMP 7.5 Administrator’s Guide at page 65 . I do not know if netupp has this capability.

 if no of the above is your case, please descried it more

nbmagic's picture

In order to achieve D-D-T infrastructure, my question was, and still is,  can I use "lifecycle" policy to replace "Disk Staging" (creating such storage unit)?

A couple of responses seem already said "yes" on my question. However, after read several messages thereafter, I am seeking the reconfirm now.

Essentially, both of methods backup data onto disks (ex, using Openstorage NetApp as the storage unit), then from there copy data into the tape library. This is how I understand.

What am I saying above sounds right to you? 

I was confused myself to bring NDMP topic in my original message. To simplify my question, I’d like to take NDMP off from my questions for now. I may create a new quesiton for this topic.

I am sorry for confusing you, and thanks for all responses.

StefanosM's picture

A simple question that I should ask it at my first post.

Are you going to use Netupp as basic disk staging storage unit?

StefanosM's picture

to use netupp as DSSU?
No, its OK

As you said, you can not use SLP as SLP works only with Advanced disk STUs and OST STUs (netbackup deduplication and third party disk storages)

On the other hand, DSSU has no logic to use NDMP to transfer backups from disk to tape. The duplication path for an DSSU is always DISK-> media server -> tape.

Your answer is still not clear to me.

Are you going to use Netupp as basic disk staging storage unit (DSSU) ?

I have the filling that you are missing information on how netbackup is working what possibilities you have with netbackup and how your storage work.
Probably someone did a presentation to your company about a proposed solution, but technically you are missing  a lot of information.

It is better to contact a symantec presales or a symantec partner to work with him about the solution you want to implement. Or at least ask for more technical information about the solution.