1Jeff Stieglitz  6/8/2009 7:59:55 PM  Good Luck! Please keep us posted

I'll be following your efforts with great interest; thanks for the post.

Some time ago, I had an installation that used the Domino Single Copy Object store. Over time, and after innumerable Domino crashes, the store became unusable, and hundreds of people were calling me with incruitable errors like "entry in index not found".

It was just horrible. Lotus could not accept a file that large for examination via electronic means, and would not accept a file via the post office.

Since then, I have sworn off that type of technology, thinking that one mail file per customer offers lots of redundancy and simplifies backup/recovery.

Your results seem encouraging so I hope you post a status report in a few months.

Jeff

  2Darren Duke  6/9/2009 7:12:58 AM  Sounds like you mean "Shared Mail"

@1, let me point out that Shared Mail never really worked and, personally, I never, ever enabled it a client. Storing that amount of attachments in a NSF is a plain bad idea. We've all heard the horror stories about Shared Mail and yours is, unfortunately, one of many out there.

However, DAOS is in no way related to Shared Mail. It is a completely different animal and works as advertised. It utilizes the underlying OS for attachment storage, which is after all sometimes called a "file server" ;)

We've implemented DAOS many, many times since January when 8.5 went gold and have not had an issue. You are correct about it being a non-simple recovery right now but that should change when the backup vendors catch up in 3-9 months. However, you can always cluster and/or replicate to a non-DAOS server for that purpose (but you will lose a 50-80% reduction in backup time if you do that). Backup using DAOS on the other hand is much, much smoother and faster. Hopefully one will be backing up more than recovering.

  3Lucas  6/9/2009 8:06:20 AM  Impressive

This is very impressive. Nearly 480GB with very little cost, who could argue with that.

  4Lucas  6/9/2009 8:08:04 AM  Impressive (continued...)

I mistyped that, I meant to say 380GB, not 480GB, forgive my fat figures.

  5Ryan  6/9/2009 1:51:45 PM  Compressing

All in all this was a tremendous jump. This will help our company in the future to come.

Great company STS

  6John O’Laughlin  6/9/2009 5:21:56 PM  Does this work across mail servers?

We have a number of Domino Mail servers in the same datacenter, does this work across Domino mail servers too? Or is it limited to one DAOS store per mail server?

  7Darren Duke  6/10/2009 5:36:38 AM  Our largest DAOS implementation yet. Pre-DAOS 594GB of mail

@5, thanks Ryan.

@6, no, DAOS is a per-server technology. Hence there is a DAOS repository stored on each DAOS enabled server (remember, all server do not need to be DAOS enabled either and they will all replicate fine). There were some indications at LS09 that DAOS could have some "central storage" options in a future release. Even without this future option the savings can be staggering. It is mouthwatering to think what a central storage option could do :)

  8Irv Schor  7/6/2009 8:13:19 AM  What if a company is already going to invest in Dedup for other means?

Hello,

I am reviewing DAOS as an option, however our organization is already moving forward with other Deduplication technology that runs on a per-server basis as the disk level. Apparently, an agent will sit on the operating system hosting the server and it will handle all deduplication operations. Is there any benefit to considering DAOS in this fashion? Is there a performance benefit in addition to the disk savings in using DAOS? Note: The decision to use a dedicated deduplication technology was an enterprise-wide decision (not just related to Domino).

  9Irv Schor  7/6/2009 8:17:17 AM  Backup and Restores.

One other question related to restores. If you are backing up the files, it seems that the all of the .nsf files and the entire DAOS file system containing all attachments. If lets say, 3 years from now I need to restore a single .nsf file, I would also need to retreive the daos files from that time period as well, and then if I needed to submit a single file for discovery, for example, then make a replica (local, or on a non-DAOS enabled server) to provide full standalone fidelity. Is this correct, or will there be a special backup API on the way?

  10Darren Duke  7/7/2009 5:52:26 AM  What if a company is already going to invest in Dedup for other means?

There are some other benefits other than straight de-dup. The main one being much, much smaller NSF files. This in turn leads to a much more streamlined server (happier server) as there are no longer any large binary files stored inside the NSF file. Compact, Updall, etc all run much, much faster. Additionally, with much smaller NSF files chances of database corruption should be reduced. All-in-all DAOS is more then just de-dup.

  11Darren Duke  7/7/2009 6:04:16 AM  Backup and Restores.

The backup providers are about 6-9 months behind on DAOS so right now restoring is somewhat manual process. I would expect Symantec, IBM, CA, et al to eventually restore the DAOS NLO files automatically at some point in the future. In the meantime check out this post, http://blog.darrenduke.net/Darren/DDBZ.nsf/dx/daos-my-2-cents-and-a-possible-future-and-how-to-back-it-up.htm

  12Irv Schor  7/7/2009 8:41:09 AM  Backup and Reestores

Thanks for that update. I think if we go is route, we'll save disk on our mail servers and improve its 'happiness' as you put it (smaller .nsf files, etc.). We will, however, then to move our backups to a replication 'hub' type server containing the full .nsf files from which we can use our dedup solution (Avamar) to handle the day to day changes. Without APIs in place, the restoration of a DAOS enabled server (more so an individual file from a particular point in time) seems fairly challenging at present. Thanks for your quick response. This info is very helpful.

  13Latheef  1/16/2011 12:42:15 AM  DAOS & Shared mail

We have few shared mail boxes.

But in the server document, shared mail is disabled.

In this case, will it be a problem enabling DAOS in our Domino server?