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Status Not under consideration
Workspace Db2
Created by Guest
Created on Mar 6, 2018

db2 luw restore to avoid O_SYNC writes on the tablespace containers and perform a final fsync()

db2 luw restore performance is very slow. The problem was identified and recommended solution is to avoid O_SYNC writes on the tablespace containers and perform a final fsync()

From: David Sciaraffa
Date: Tuesday, February 27, 2018 at 6:57 PM
To: Raj Merchia
Cc: "Inala, Aravind" , Biswarup Mukherjee , Christopher Tsounis , Dale McInnis/Toronto/IBM , Dave Ziony , Hemanth Thota , Scott Maberry , Vinod Machcharla
Subject: Re: Visa - Restore performance on 100TB database (Case TS000107666)
thanks for sharing. The feedback I received from our Db2 memory architect had similar detail about how GPFS utilizes its buffer pool and not the filesystem cache.

I'm gaining more confidence that it will be possible to move forward with prototyping a method for Restore to avoid O_SYNC writes on the tablespace containers and perform a final fsync() at the end.
This is not at the top of our domain's priorities at the moment, but I'll try to squeeze in some time to prototype it soon. I cannot provide you with an ETA yet.

David Sciaraffa, Development Manager, Db2 Availability, 905-413-4037
IBM Toronto Development Lab, C4/152/8200/MKM