RE: HDR in IDS 10.0xc5: slow Secondary restart

Hi, Madison, I've submitted the problem to the ESR system. Actually, I ran into another problem with HDR on 10.FC5: When FASTPOLL is set to '1' (enabled) on Secondary, one of NETVP oninit's is consuming all available cpu resources of a single cpu on Seconsdary. I know, that it doesn't make much sense to use 'epoll' on Secondary (hardly anybody has handreds of network connections on Secondary), but still it makes sense to have similar configuration on both machines... I filed this as another problem to ESR -Alexey > -----Original Message----- > From: informix-list-bounces@iiug.org [mailto:informix-list-bounces@iiug.org] > On Behalf Of Madison Pruet > Sent: Saturday, June 10, 2006 8:00 PM > To: informix-list@iiug.org > Cc: ids@iiug.org; informix-list@iiug.org > Subject: Re: HDR in IDS 10.0xc5: slow Secondary restart > > Alexey Sonkin wrote: > > Hi, everybody, > > > > Long-awaited IDS 10.0xC5 (with a great FASTPOLL feature) is finally > released... and appeared to be almost unusable for large installations, using > HDR > > > > Really, really bad 'feature' was added to HDR mechanism. > > > > Every time, HDR Secondary is restarted (that is, stopped and started again), > > IDS completely re-writes all logical logs on Secondary. > > All logical logs become market with F------ flag, and all logical log pages > become re-initialized with page number in a page header and zeroes inside, > like: > > > > Alexey, > > We've always had code in place to zap the logs when we needed to. We > have to do this to prevent us from trying to apply the logs which we > need to ignore and recapture from the primary. > > We recently put in some modifications to address some places where we > were clearing the logs needlessly. I suspect that the case that you're > running into. Please open a case on the problem. We'll address it as > quickly as possible. > > > > > stage10@dw-1g:~$ hexdump -s 108544 -n 2048 /dev/lds1 > > 001a800 0000 0000 0000 0000 0000 0000 0000 0000 > > * > > 001b000 > > > > Do I need to say, how slow it is? > > On my staging machine (older copy of production, used for QA), > > I have 140 GB of logical logs. > > The staging array (not very fast) is able to write at 50 MB/sec, > > but IDS (may be, because of small 1-MB block size, > > used for data writing with pwrite() ) only writes at 20 MB/sec. > > > > That is, it takes about two hours to simply restart Secondary... > > I had plan to double the total logical log volume.. > > With 10.0fc4, it takes me just two minutes to restart Secondary > > and have the HDR replication re-synchronized. > > > >>From 2 minutes to two hours... Not a good upgrade path (FC4->FC5) > > > > I plan to file this problem to IBM asap > > > > > > -Alexey Sonkin > > > > > _______________________________________________ > Informix-list mailing list > Informix-list@iiug.org > http://www.iiug.org/mailman/listinfo/informix-list