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Nov 3, 2015, 8:14 AM
37 Posts
topic has been resolvedResolved

DAOS - Transaction Logging - Consistency Check

  • Category: Domino Server
  • Platform: Windows
  • Release: 9.0.1
  • Role: Administrator
  • Tags: DAOS,Transaction Log,Consistency Check
  • Replies: 3

We recently had an incident where the Transaction Logs needed to be re-created for a server with 3Tb of mail data on it, it took several hours.

We are also thinking of moving that same server to DAOS as we would save around 50% disk space in the data folder (if we set the threshold at 1m).

My question is simple.

How would being DAOSed before this incedent have effected the consistency check ?

     Would it reduce the time because the dbs are 50% smaller

or

     Would it increase the time because DAOS gets involved in the consistency check ?

or

     Would it make little difference ?

 

Thanks for any information or pointers on this

Ian

Nov 4, 2015, 7:23 PM
32 Posts
A couple of things
What caused the txn logs to have to be recreated ?

If domino was shutdown cleanly prior to the txn logs being recreated, there would be no affect w/ DAOSifying the databases since we are just clearing out any LSNs stored in the database.
If the server had been crashed when the txn logs were recreated, I don't think DAOS would affect the fixup time, but the DAOS dev would need to say definitively.

--Steve
swatts@notesdev.ibm.com
Nov 4, 2015, 7:45 PM
12 Posts
DAOS and fixup
Fixup should run a bit faster simply because there is less data in the NSF to plow through, and that means less I/O.  Instead of 1M+ of inline data, there's a 200-byte DAOS 'ticket', the reference to the NLO file.  
Nov 9, 2015, 9:51 AM
37 Posts
Many thanks for the answers

Many thanks for the replies.

The Server crashed after the circular transaction logs looped on themselves.

I think DAOS is probably the way forward now.

 


This forum is closed to new posts and responses. Individual names altered for privacy purposes. The information contained in this website is provided for informational purposes only and should not be construed as a forum for customer support requests. Any customer support requests should be directed to the official HCL customer support channels below:

HCL Software Customer Support Portal for U.S. Federal Government clients
HCL Software Customer Support Portal