Another week, another DAOS posting!

This time a AS400 upgraded from 7.0.3 to 8.5.1 FP2. For some reason IF1 for V5R4 kept coming down as a corrupt file....oh hum. This was a brand new 8.5.1 cluster so all the mail files were replicated across. We did two compacts, the first with the compression settings and the second with DAOS.  Anyway some facts and figures:

Prior to DAOS mail file size : 322GB
After compression compact : 246GB or 23% reduction. This is probably the largest -n -v -ZU result I have seen to date. Not too shabby. And that is before DAOS!

This being an AS400 the DAOS minimum size is 1MB so we won't see a 65% reduction, but still.....

Post DAOS nlo size : 41.44GB
Post DAOS nsf size : 142GB
Post DAOS total size : 183.44GB

A total storage reduction of 43% or 139GB.
This fits right into the average AS400 we see of 40-45% savings with DAOS and the "8.0.1" compression settings. As the customer upgrades their templates to 8.5.x we'll also enable SCT (Single Copy Template) for further savings expected to be 2.5GB reduction.

Don't forget to see other DAOS real world results to see this is not a one off!
Darren Duke   |   May 10 2010 05:11:23 PM   |    daos    |  
  |   Next Document   |   Previous Document

Discussion for this entry is now closed.

Comments (3)

Gravatar Image
1 - Reid Partlow    05/10/2010 6:19:10 PM

Already went round and round with this and IBM. The file isn't actually corrupt, it just has the wrong extension on it. Its already the save file, so just remove the extension, if there is one, and upload it to the iseries.

Gravatar Image
2 - Darren Duke    05/15/2010 8:07:04 AM

@1 Ah-ha! Thanks. I really should have know this as this is not the first time this has happened. A customer has subsequently informed me it has been rectified on Fix Central now.

Gravatar Image
3 - Lars Berntrop-Bos       08/22/2011 3:57:29 AM

Hi Darren,

Do you have more info why iSeries has a higgher minimum DAOS attachment participation size? At which point would the number of nlo files 'overwhelm' the file system?


Lars Berntrop-Bos,