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
Subject: 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
Subject: 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.
Subject: 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.